What? A video on friday? Long story short, I will be going on vacation tomorrow and take a small break from producing videos. So this is basically the video for sunday. But don't be scared, there will probably be another video ready for the next sunday.
4 years later this information is still gold... Anyone else admiring the neatness of his handwriting? That alone makes the video more plausible and the results from the calculations, as well as his conclusions more believable. 😃
The final calculations were shocking to me, but they confirmed how AWESOME you are to not hesitate to show real numbers even if you don't like the outcome. Keeping it real! I like that!
Mppt really comes into its own with larger systems where the PV voltage is configured to be much higher than the battery through series connection of panels. In either case though, the energy harvested over the whole day will be significantly greater with a good mppt controller. Really enjoyed the video mate, cheers!
For many people the solar efficiency is not a monetary matter. Instead...it is their only way to obtain any energy so the extra power you can capture on any given day is priceless. Nice video!
Something that you didn't mention is the main function of the MPPT is to vary the voltage or current in order to maximize the power generated depending on the temperature and irradiance of the PV panels. This is specially important during days with lots of clouds in the sky since partial shading of panels can really decrease the power generation if this is not compensated by an MPPT module.
It's not a complex idea. Construct a graph of your panels' voltage vs. current. You want to have the line from the origin to your panels position on the Current/Voltage diagram have its maximum length. Equivalently, find the point on the curve where the tangent's normal passes through the origin. The issue is that the curve changes shape as illumination changes (you really need a 3-D map if you wanted to do it like your car's ECU) and an iterative approach is needed. The simplest is this: change the voltage on the input by varying the duty cycle on the controller. If this increases the power, do it again and again until it doesn't. Repeat every few intervals or when a large excursion happens on the input power.
Great video...thanks. Im a EE and q General class radio operator. I built a 125aH portable battery power box, for my power needs outdoors for long weekends operating radios and everything else I needed for my comfort...fan, lamps ect ect. I use a $15 no name charge controller now for about 6 years of regular use. It performs very well.
You forgot one of the most important points about MPPT vs PWM! Most PWM controllers will not work until the output voltage of the panel reaches a certain voltage, but a MPPT panel can boost low panel output during early morning and evening sunlight. This means that you get more hours of battery charging during the day from MPPT instead of PWM.
That might be important for grid-tied systems or any system that needs to maximize watts all day long, but for many people who are using solar on RVs or off-grid if they're still desperate for watts at the end of the day they've got their system sized way too small. The PWM system on my camper starts charging the moment the sun is on the horizon and my batteries are fully charged by 10 am to noon on sunny days. By the end of the day I don't care if it's getting any watts at all since it's just been throwing them away all afternoon anyway. On cloudy days when charging is minimal, yeah, maybe that would make a bit of a difference. But I prefer to have enough amp hours in the battery bank to last at least 5 days without any charging at all, to guard against running out of power in case of multiple cloudy days, etc. PWM has worked fine for me for ten years now and it saved money over going with MPPT. Everyone should do the math for their particular system. Sometimes MPPT is the only way to go, but sometimes not.
@@stopPlannedObsolescence You would need to know how much power your fridge pulls, especially on startup. I'm assuming it's a residential fridge? Those pull a lot of amps on startup. Then you need enough solar panel wattage to handle that and an inverter to convert the solar array's voltage to whatever voltage the fridge runs on (120, 240?). But I think you'd be better off with a battery bank. Otherwise the power would fluctuate every time a cloud passes over. I would think that could damage the fridge's motor over time.
@@MTMiser thank so much mate,yeah so with this point of view, i think is better a bank batteries that support the peak and the consume required for 1 hour like minimum ,or another idea is a onGrid system for reducing my kw/h just for startting in this world.ty and escuse me for my bad english heheh
@@stopPlannedObsolescence If you would not want to use a battery (can't recommend) you better use a peltier fridge. It does run on 12V and it will not stop running if too less power (like a 12v compressor fridge)
Thank you so much for making a video about this! I've been scavenging parts to build a portable solar generator for a while now. This video was VERY helpful! P.S. It depends how damp your garage is and how cold that block wall gets in the winter but keep an eye on those exposed terminals they can corrode quite quickly if condensation is present. If that happens adding a plywood backboard and/or some dielectric grease should remedy the problem. I see it alot in mains electrical panels.
good call @Samara Saunders - Installation is as important as compatibility and other tech stuff. I have seen expensive equipment (not speaking of solar specifically) fail due to corrosion, within a year, through damp getting into low power circuitry. Things start getting weird (unreliable) first then failing completely.
I purchased some MPT7210a controllers, mostly because I use a mix of 230w, 285w, 300w panels charging a 60v LiFePO4 stack. It's fun to watch them compete with one another to push current into the batteries when the system is under load
although I've only subbed recently.... now i finally find the video that reveals the face behind the voice... so clear yet concise... overall I gotta admit I am learning from your content as time goes on.
I also have a small solar off-grid system and I used a PWM charge controller from Steca for a long time. This charge controller is absolutely great for small solar systems and its of high quality as well. But I also bought the MPPT charge controller from Victron with a integrated bluetooth module and it works just fine. I think a PWM charge controller from a well known brand like Steca is a safe choice unless you want to build a bigger solar system.
I've watched many (but not all) of your videos, and this is the first time I've actually seen your face!! But Thank you.. You confirmed with what I thought on my small project and I appreciate it.
One thing you neglected with the first PWM controller has a variable input power setting from 13.7 (default) to 15 volts, the 15 volt setting would bring in not 3 amps but upwards of 16 amps depending and your current battery charge state.
Great video, GreatScott! It's great to see somebody saying to do the math before choosing between MPPT and PWM. It seems a lot of people think MPPT is more efficient than PWM so that's all you need to know - go with MPPT! But PWM makes sense for many people. You really have to do the math for your particular system in addition to taking other factors into consideration (like build quality, etc.). I built a solar system for my truck camper back in 2009. I wanted to go with a high quality charge controller so I bought a Morningstar PWM. It cost me $155 US but it is a solid, excellent quality controller that is still working flawlessly today. The MPPT version of the same controller was almost $380, $225 more than the PWM version. I added an extra solar panel to my array to make up for the difference between PWM and MPPT. The MPPT controller would have given me 39% more watts to my batteries (at the most, not all the time). The extra panel gave me 36% more wattage, so nearly the same advantage. And the extra panel was $100 instead of the extra $225 for the MPPT controller. So it saved me $125 over going with MPPT. And for 9 years now the system has been working great.
Uei! Finally I see the man behind the voice. Thank you for the video. All together, what I think in the end is that it does not mater if a solar panel can produce energy for 25 years if a solar charge controller need to be replaced after some years (meaning more money) and if you consider the price of energy you will get in the same price as if you paid the monthly bill. I like solar but I have doubts about the final cost.
As I am sure you know, but did not state for the video, the MPPT really begins to shine when you hook up the panels in series. Increased panel voltage is less loss in the wires and the MPPT can convert the higher voltage.
I don't know if you have appeared on your channel before I subscribed to it. but It is great to see you, generally I think great scott with flashing LEDs only. I always thought of you a mentor, and your projects inspired me.
Thank you so much for this. I know product reviews are not really your thing, but this was totally relevant. I hope to see additional videos like this in the future.
I have the same victron charger and also had a couple of cheap pwm chargers like these. the real benefit of using an mppt charger is when the sky is cloudy it produces a lot more energy than a pwm charger
Thank you really much for the comparison! This helped me a lot. I think I will firstly get a PWM-Controller, since they are not that expensive and I can always upgrade to an MPPT-Controller later down the road. Enjoy your vacation!
I have that cheep black pwm controller on a 300w 3 panel solar system, Charging four 6v batteries wired in series and parallel to give a 12v block at 450Ah, each 6v = 225Ah ive had it for 2 years now and was going to get a mppt controller but after seeing this video i don't think i will bother :) thanks for sharing this info.
Thanks. It would be nice to get a little theory of operation between the MPPT and PWM chargers. Good work on the vid as it's good to see real numbers. Learned about you from your interview on the Amphour!
I had the white china-model in use for appr. 3/4 year. Pretty much the same setup, 100W solar Panel and approx. 70AH battery. It worked so far, but I did not trust it. It was rated 20Amps, but I put a 15 Amp preliminary fuse in series with the controller, and the solar Panel. The load got a 10Amp one. - I don't would recommend pushing these things to the limit. Last week I relaced the controller with the much nicer MPPT you showed in your offgrid Video. This is a very nice controller. I like the bluetooth features, nice for tracking the data.
Great video. Comparing the price of electricity with the price of MPPT/PWM only makes sens if you have access to electricity from the grid. When people are living off the grid, they tend to be more interrested to produce more electricity in order to not run out of juice.
I like your videos, thanks. I have been experimenting with a 24V solar system with panels on a reasonably priced Tracer mppt charge controller and a single 190W 24V panel on a fake mppt-30 (pwm) controller, both controllers parallel charging the same flooded lead-acid battery bank. It is interesting that when the mppt controller is boosting and the battery voltage is quite high the 190W panel on the pwm controller is close to its peak power voltage and it works really well. On a ideal day with summer sun and the panel not too hot I have seen just over 200W from the 190W rated panel. But this is an unusual situation where voltage is high and the pwm controller is connecting the panel almost directly to the battery. The Tracer mppt controller seems to work reasonably well and is well built internally. The mppt tracking seems a bit slow and sometimes pulls the panel voltage down which reduces power. I have a temperature controlled fan behind the heatsink which is necessary at higher charge current. It is sunny and cool at the moment and the mppt controller has the panels at about 71V 8A and the battery charge at 29V 20A. The panel maximum power point is about 62V, so the load is less than it could be. I set up a simple Arduino data logger a few days ago just recording temperature, light level and battery voltage. I will expand it to include current one day soon.
I have two separate 12 volt battery banks charged from two separate controllers, one is cheap Chinese PWM the other a VICTRON MPPT, many times the Chinese PWM UNIT charges the 12 v battery QUICKER than the MPPT! REASON? THE cheap Chinese charger is charging a CHINESE LIFEPO4 LITHIUM battery! People tend to focus only at the controller but a CHINESE lifepo4 battery has an almost 90 percent charge efficiency,while the sluggish accient Lead chemistry struggles to reach even 60 percent,that's especially important for smaller systems ( under 200 watt of panels) a good MMPT controller ( and yes the Chinese make these to) is only giving a little extra charge boost when running the panels in series connected and become even more important when you must run long cables from them to the controller, for a typical small solar panel setup let's say 2 times 100 way panels it's often more economical to connect these in parallel to a PWM controller, especially on a camper park under or near trees struggling with shading ...again a CHINESE product can be JUST AS GOOD but often way cheaper than a western made product, and working with a way better chemistry ( lifepo4) has a much greater impact!
Thank you for the video. But I have to add that ,the temperature and total flux are two major parameters that should be taken account in order to determining which controller is the best. These two parameters make the bluestar mppt charge controller more valuable, especially in the low light flux and high temperature limits.
Hi. Here in France, the kWh costs around 0,129 € all included. In peak hours : 0,0946 € / kWh + 20 % tax In off-peak hours : 0,0728 € / kWh + 20 % tax To this it includes a subscription to the grid of 9,53 per month + 5,5 % tax Other taxes and contributions are 60,68 € per 2 month + 20 % tax And 3,02 € per 2 month + 5,5 % tax So the total price I paid for the last bill for 1.892 kWh was 243,76 €. => 243,76 / 1.892 = 0,129 € per kWh.
I have and use both of those Chinese solar controllers in my RV's and like them both. However the first one (Beige in color) is fully programmable and works amazing for what you pay . I used it in my last RV for 4 years with 200 watts in panels and 4 X 6 volt Trojan T105 batteries (wired to 2 - 12 volt banks). The one and only downfall I experienced was when the batteries are fully charged at 13.6 or 13.8 volts the charger said you were at %80. You had to turn up the cut out to 14.6 volts for it to read %100 and then of course the batteries would be boiling. I just locked my cut off to 13.4 and ran it like that for 4 years. When I sold that RV and bought my next one I went with the second one you tested. The Black controller. Because ...... Well it was pretty. It charges great but has no adjustable parameters and pumps the batteries to 14 volts and holds them there. I have some people say that is fine but I honestly do not like it that high. The reason I like these Chinese chargers is because they are cheap and they have full read outs on them without having to buy some ridiculous blue tooth module. That is just my personal experience other people may have different opinions.
What? A video on friday? Long story short, I will be going on vacation tomorrow and take a small break from producing videos. So this is basically the video for sunday. But don't be scared, there will probably be another video ready for the next sunday.
Enjoy your holidays Scott!
GreatScott! where are you gonna go.
sir you are making a ordinary person a engineer
Enjoy your vacation !!! Thanks for video, and i will see you next time !!!!
GreatScott! Man your videos are awesome!!!!
4 years later this information is still gold... Anyone else admiring the neatness of his handwriting? That alone makes the video more plausible and the results from the calculations, as well as his conclusions more believable. 😃
I couldn't agree more.
for some reason I find this really satisfying seeing your face saying "Stay creative and I will see you next time"
Sapher me too, it's so weird
Sapher oh, me too
Agreed, it's great to see his face. More (for lack of a better word) "Personable" that way
Finally, a face to the voice - love your videos :)
factory whatsapp+8613798209142
Nice to see you on friday!!!!
can you use grid tie inverter?
Te le adelantaste a Scott con la energía solar eh! jaja, abrazo!
www.amazon.com/dp/B0778D7SP9
The final calculations were shocking to me, but they confirmed how AWESOME you are to not hesitate to show real numbers even if you don't like the outcome. Keeping it real! I like that!
I saw you face GreatScott at first time. Thank you very much great video every times. Especially I love your schematics drawing beauty. Thank a lot.
Mppt really comes into its own with larger systems where the PV voltage is configured to be much higher than the battery through series connection of panels. In either case though, the energy harvested over the whole day will be significantly greater with a good mppt controller. Really enjoyed the video mate, cheers!
For many people the solar efficiency is not a monetary matter. Instead...it is their only way to obtain any energy so the extra power you can capture on any given day is priceless. Nice video!
GREAT VIDEO!!!
And I agree with everyone else. SO GLAD you finally came in front of the camera!!! :-D
Something that you didn't mention is the main function of the MPPT is to vary the voltage or current in order to maximize the power generated depending on the temperature and irradiance of the PV panels. This is specially important during days with lots of clouds in the sky since partial shading of panels can really decrease the power generation if this is not compensated by an MPPT module.
Yep he is human after all. Just like everyone else. Do not panic people.
Can't wait for a diy mppt charge controller...
It will happen....but not soon.
GreatScott! awww
It's not a complex idea. Construct a graph of your panels' voltage vs. current. You want to have the line from the origin to your panels position on the Current/Voltage diagram have its maximum length. Equivalently, find the point on the curve where the tangent's normal passes through the origin.
The issue is that the curve changes shape as illumination changes (you really need a 3-D map if you wanted to do it like your car's ECU) and an iterative approach is needed. The simplest is this: change the voltage on the input by varying the duty cycle on the controller. If this increases the power, do it again and again until it doesn't. Repeat every few intervals or when a large excursion happens on the input power.
There is even a chip that he could base a circuit off of.
GreatScott! i made one. not effective but working.
My sincere respects for this guy who take seriously efficiency analitical energy costs. You are a true hero. Cheers from Argentina!!
finally got to see man behind such a great show, thanks for being inspiration for plenty of my diy projects.
+Navin Choubey No problem :-)
Great video...thanks. Im a EE and q General class radio operator. I built a 125aH portable battery power box, for my power needs outdoors for long weekends operating radios and everything else I needed for my comfort...fan, lamps ect ect. I use a $15 no name charge controller now for about 6 years of regular use. It performs very well.
Video quality just got better, keep it up scott
You forgot one of the most important points about MPPT vs PWM! Most PWM controllers will not work until the output voltage of the panel reaches a certain voltage, but a MPPT panel can boost low panel output during early morning and evening sunlight. This means that you get more hours of battery charging during the day from MPPT instead of PWM.
That might be important for grid-tied systems or any system that needs to maximize watts all day long, but for many people who are using solar on RVs or off-grid if they're still desperate for watts at the end of the day they've got their system sized way too small. The PWM system on my camper starts charging the moment the sun is on the horizon and my batteries are fully charged by 10 am to noon on sunny days. By the end of the day I don't care if it's getting any watts at all since it's just been throwing them away all afternoon anyway. On cloudy days when charging is minimal, yeah, maybe that would make a bit of a difference. But I prefer to have enough amp hours in the battery bank to last at least 5 days without any charging at all, to guard against running out of power in case of multiple cloudy days, etc. PWM has worked fine for me for ten years now and it saved money over going with MPPT. Everyone should do the math for their particular system. Sometimes MPPT is the only way to go, but sometimes not.
@@MTMiser do u know how i can use a system without batteries ? iwanna just work for my fridge in the ligthday
@@stopPlannedObsolescence You would need to know how much power your fridge pulls, especially on startup. I'm assuming it's a residential fridge? Those pull a lot of amps on startup. Then you need enough solar panel wattage to handle that and an inverter to convert the solar array's voltage to whatever voltage the fridge runs on (120, 240?). But I think you'd be better off with a battery bank. Otherwise the power would fluctuate every time a cloud passes over. I would think that could damage the fridge's motor over time.
@@MTMiser thank so much mate,yeah so with this point of view, i think is better a bank batteries that support the peak and the consume required for 1 hour like minimum ,or another idea is a onGrid system for reducing my kw/h just for startting in this world.ty and escuse me for my bad english heheh
@@stopPlannedObsolescence If you would not want to use a battery (can't recommend) you better use a peltier fridge. It does run on 12V and it will not stop running if too less power (like a 12v compressor fridge)
Thank you so much for making a video about this! I've been scavenging parts to build a portable solar generator for a while now. This video was VERY helpful! P.S. It depends how damp your garage is and how cold that block wall gets in the winter but keep an eye on those exposed terminals they can corrode quite quickly if condensation is present. If that happens adding a plywood backboard and/or some dielectric grease should remedy the problem. I see it alot in mains electrical panels.
good call @Samara Saunders - Installation is as important as compatibility and other tech stuff. I have seen expensive equipment (not speaking of solar specifically) fail due to corrosion, within a year, through damp getting into low power circuitry. Things start getting weird (unreliable) first then failing completely.
I purchased some MPT7210a controllers, mostly because I use a mix of 230w, 285w, 300w panels charging a 60v LiFePO4 stack.
It's fun to watch them compete with one another to push current into the batteries when the system is under load
although I've only subbed recently.... now i finally find the video that reveals the face behind the voice... so clear yet concise... overall I gotta admit I am learning from your content as time goes on.
I think the true value of the MPPT will become apparent when there is partial shading on the solar panel or when it is cloudy.
I also have a small solar off-grid system and I used a PWM charge controller from Steca for a long time. This charge controller is absolutely great for small solar systems and its of high quality as well. But I also bought the MPPT charge controller from Victron with a integrated bluetooth module and it works just fine. I think a PWM charge controller from a well known brand like Steca is a safe choice unless you want to build a bigger solar system.
first time to see great Scott face not disappointed at all.
looks awesome dude 😉
Good to see you after a long time.
This is my first time to watch your video with you in the front explaining anything.
This is a really good presentation. You have included considerations that nobody else has thought of. Good work.
I've watched many (but not all) of your videos, and this is the first time I've actually seen your face!! But Thank you.. You confirmed with what I thought on my small project and I appreciate it.
Great video to watch on a Friday, regards Scott!
Excellent both in writing and in verbalizing clear into the point
One thing you neglected with the first PWM controller has a variable input power setting from 13.7 (default) to 15 volts, the 15 volt setting would bring in not 3 amps but upwards of 16 amps depending and your current battery charge state.
Excellent explanation and comparison! I don’t feel so bad about my cheap PWM controller for now but may upgrade to a better quality unit later.
Feel good to hear you, also to see you
Thought great scott was around 40. Not disappointed
Great video, GreatScott! It's great to see somebody saying to do the math before choosing between MPPT and PWM. It seems a lot of people think MPPT is more efficient than PWM so that's all you need to know - go with MPPT! But PWM makes sense for many people. You really have to do the math for your particular system in addition to taking other factors into consideration (like build quality, etc.). I built a solar system for my truck camper back in 2009. I wanted to go with a high quality charge controller so I bought a Morningstar PWM. It cost me $155 US but it is a solid, excellent quality controller that is still working flawlessly today. The MPPT version of the same controller was almost $380, $225 more than the PWM version. I added an extra solar panel to my array to make up for the difference between PWM and MPPT. The MPPT controller would have given me 39% more watts to my batteries (at the most, not all the time). The extra panel gave me 36% more wattage, so nearly the same advantage. And the extra panel was $100 instead of the extra $225 for the MPPT controller. So it saved me $125 over going with MPPT. And for 9 years now the system has been working great.
Please take apart the cheap charge controllers!
Uei! Finally I see the man behind the voice. Thank you for the video. All together, what I think in the end is that it does not mater if a solar panel can produce energy for 25 years if a solar charge controller need to be replaced after some years (meaning more money) and if you consider the price of energy you will get in the same price as if you paid the monthly bill. I like solar but I have doubts about the final cost.
As I am sure you know, but did not state for the video, the MPPT really begins to shine when you hook up the panels in series.
Increased panel voltage is less loss in the wires and the MPPT can convert the higher voltage.
OMG I thought you are middle aged guy with this knowledge :o You really have done your lessons and research well!
Crazy! Never thought you looked like that. It's great to see the face behind the videos 👍
Great to meet you in "person"!
I appreciate your practical view of the two type of charger
Was just browsing for controllers on eBay and wondering about the price differences. Great video - thanks!
I don't know if you have appeared on your channel before I subscribed to it.
but It is great to see you, generally I think great scott with flashing LEDs only.
I always thought of you a mentor, and your projects inspired me.
Thank you for showcasing and explaining the different concepts so easily in this video.
I always appreciate the formulas and detail! excellent work as always. that guy about the Stirling engine has an interesting point to followup on.
I also like the talking to the camera video format.
Enjoy your vacation, you deserve it for all your efforts !!
I prefer those kind of talking to the camera videos
nice to see you scott.
This is a really good video, keep them up like this man. It's good to see your channel evolve
Nice surprise to see you, awesome work you are doing mate... Helps a lot to nerds like me
Hi your systems is very good, Congratulations from Brazil
Thank you so much for this. I know product reviews are not really your thing, but this was totally relevant. I hope to see additional videos like this in the future.
Finally I see a video that starts with our hero GreatSCott himself!
I have the same victron charger and also had a couple of cheap pwm chargers like these. the real benefit of using an mppt charger is when the sky is cloudy it produces a lot more energy than a pwm charger
Thank you really much for the comparison! This helped me a lot.
I think I will firstly get a PWM-Controller, since they are not that expensive and I can always upgrade to an MPPT-Controller later down the road.
Enjoy your vacation!
This is not what I thought great Scott would look like
I like this format with the intro and outros, nice touch!
holy shit iv been watching greatscott for 2 years and i always thought his blonde and wear a glass i was like dammmn
I have that cheep black pwm controller on a 300w 3 panel solar system, Charging four 6v batteries wired in series and parallel to give a 12v block at 450Ah, each 6v = 225Ah ive had it for 2 years now and was going to get a mppt controller but after seeing this video i don't think i will bother :) thanks for sharing this info.
i still dont understand how he can write that much well by holding that pen like that :D you're really great "GreatScott" :D
So young. So stress free. Ah 5 years ago, simpler times.
That handwriting is so satisfying..
There's a reason why people say 'Thank God its Friday' and today I realized why.
Is because you are a cheap slave. Work for yourself or be a slave
@@alexstrings bro he meant that Friday because of the fact that this video released on a Friday which was "Out Of Schedule"
@@attackaffection5444 sorry, i was in troll mode that day😂😂😂😂
@@alexstrings oh well nvm ok lol😂
@@attackaffection5444 lol ok!
Let's us be honest Great Scott is the best
o my God. U came infant of camera
sorry I just saw that now
That's a pretty big infant.
he don't sound like so
Sebin C Jose *doesn't
Sebin C Jose I guest* he did
good production, camera work.
Thanks. It would be nice to get a little theory of operation between the MPPT and PWM chargers. Good work on the vid as it's good to see real numbers. Learned about you from your interview on the Amphour!
Great video, in my experience a propper battery is more important. There are many cheapo solutions outthere but there build quality REALLY matters.
nice to see you on camera. great job..
I watch your videos all the time and that is really great.!!! Please continue.
Vitron products also has lots of well-documented interfacing options
what an absolute hunk! great vid
Oh god.. First time actually seeing the guy. Thought he was much much older 😂😂😂
Finally, we find you in front of camera
HERE IN MY GARAGE JUST GOT THESE NEW SOLAR CHARGE CONROLLERS!
felt good to see my guide's face!
That is some A+ penmanship
Thank you for making these kinds of videos! I really get a lot of information from them. They add much value day.
Happy to see your face again
I had the white china-model in use for appr. 3/4 year. Pretty much the same setup, 100W solar Panel and approx. 70AH battery. It worked so far, but I did not trust it. It was rated 20Amps, but I put a 15 Amp preliminary fuse in series with the controller, and the solar Panel. The load got a 10Amp one. - I don't would recommend pushing these things to the limit.
Last week I relaced the controller with the much nicer MPPT you showed in your offgrid Video. This is a very nice controller. I like the bluetooth features, nice for tracking the data.
Nice change to the Video format. Very brave.
Great video. Comparing the price of electricity with the price of MPPT/PWM only makes sens if you have access to electricity from the grid. When people are living off the grid, they tend to be more interrested to produce more electricity in order to not run out of juice.
Hello German Engineer, nice to see you.
Very interesting video. Everytime you upload something, I feel more motivated about doing a electronics project myself. Keep doing such great work!
Very thoughtful comparison. On with my learning!
Very innovative videos you are making, and specially your handwriting is great
I like your videos, thanks. I have been experimenting with a 24V solar system with panels on a reasonably priced Tracer mppt charge controller and a single 190W 24V panel on a fake mppt-30 (pwm) controller, both controllers parallel charging the same flooded lead-acid battery bank.
It is interesting that when the mppt controller is boosting and the battery voltage is quite high the 190W panel on the pwm controller is close to its peak power voltage and it works really well. On a ideal day with summer sun and the panel not too hot I have seen just over 200W from the 190W rated panel. But this is an unusual situation where voltage is high and the pwm controller is connecting the panel almost directly to the battery.
The Tracer mppt controller seems to work reasonably well and is well built internally. The mppt tracking seems a bit slow and sometimes pulls the panel voltage down which reduces power. I have a temperature controlled fan behind the heatsink which is necessary at higher charge current.
It is sunny and cool at the moment and the mppt controller has the panels at about 71V 8A and the battery charge at 29V 20A. The panel maximum power point is about 62V, so the load is less than it could be.
I set up a simple Arduino data logger a few days ago just recording temperature, light level and battery voltage. I will expand it to include current one day soon.
I have two separate 12 volt battery banks charged from two separate controllers, one is cheap Chinese PWM the other a VICTRON MPPT, many times the Chinese PWM UNIT charges the 12 v battery QUICKER than the MPPT! REASON? THE cheap Chinese charger is charging a CHINESE LIFEPO4 LITHIUM battery! People tend to focus only at the controller but a CHINESE lifepo4 battery has an almost 90 percent charge efficiency,while the sluggish accient Lead chemistry struggles to reach even 60 percent,that's especially important for smaller systems ( under 200 watt of panels) a good MMPT controller ( and yes the Chinese make these to) is only giving a little extra charge boost when running the panels in series connected and become even more important when you must run long cables from them to the controller, for a typical small solar panel setup let's say 2 times 100 way panels it's often more economical to connect these in parallel to a PWM controller, especially on a camper park under or near trees struggling with shading ...again a CHINESE product can be JUST AS GOOD but often way cheaper than a western made product, and working with a way better chemistry ( lifepo4) has a much greater impact!
Great vid. PLEASE make a "diy or buy" video about the mppt controller
Finally I can put a face to the voice!
Thank you for the video. But I have to add that ,the temperature and total flux are two major parameters that should be taken account in order to determining which controller is the best. These two parameters make the bluestar mppt charge controller more valuable, especially in the low light flux and high temperature limits.
GreatScott that was an excellent review.... at the end of the day I will stay with my BlueSolar controller. Thanks mate.
Hi. Here in France, the kWh costs around 0,129 € all included.
In peak hours : 0,0946 € / kWh + 20 % tax
In off-peak hours : 0,0728 € / kWh + 20 % tax
To this it includes a subscription to the grid of 9,53 per month + 5,5 % tax
Other taxes and contributions are 60,68 € per 2 month + 20 % tax
And 3,02 € per 2 month + 5,5 % tax
So the total price I paid for the last bill for 1.892 kWh was 243,76 €.
=> 243,76 / 1.892 = 0,129 € per kWh.
Love your handwriting - so neat😃
Good work ... Now I'm going to change my charge controller to mppt 🇰🇪
great to see you in front of the camera
I have and use both of those Chinese solar controllers in my RV's and like them both. However the first one (Beige in color) is fully programmable and works amazing for what you pay . I used it in my last RV for 4 years with 200 watts in panels and 4 X 6 volt Trojan T105 batteries (wired to 2 - 12 volt banks). The one and only downfall I experienced was when the batteries are fully charged at 13.6 or 13.8 volts the charger said you were at %80. You had to turn up the cut out to 14.6 volts for it to read %100 and then of course the batteries would be boiling. I just locked my cut off to 13.4 and ran it like that for 4 years. When I sold that RV and bought my next one I went with the second one you tested. The Black controller. Because ...... Well it was pretty. It charges great but has no adjustable parameters and pumps the batteries to 14 volts and holds them there. I have some people say that is fine but I honestly do not like it that high. The reason I like these Chinese chargers is because they are cheap and they have full read outs on them without having to buy some ridiculous blue tooth module. That is just my personal experience other people may have different opinions.
I like the new Style of this Video. You make you more present in the Video and i like it. More of this would be awesome
first time greatscott! notification scares me,,, but later only I realized this is not Sunday
ENJOY YOUR VACATION Scott!
Planning to install solar panel, this helps a lot. thanks