MPT 7210a Fan speed issue
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- Опубліковано 7 вер 2024
- MPT 7210a Fan speed issue -
1. When the fan is full speed voltage reads ok
2. When the fan is anything less than full speed the voltage fluctuates
3. Fix didn't work
4. My house might burn down if I use the MPT7210a in quiet mode :(
If you can offer any insight or offer your magical solder sucking skills hit me up!
MPT 7210 Fan Mod www.thingivers...
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Pete
#diypowerwalls #hbpowerwall #18650 #diypowerwall
I am the one who told you on the live about replacing the capacitors, because you said that the MPT- would not charge fast enough. What you've shown us here on this video is actually a different issue.
Let me start by saying that this "charger" (it's actually a good boost converter with MPPT tricks) is plagued by two different issues:
1. The fan speed - readings issue and
2. The very low output issue.
re: 1. I have two units. One of them indeed has the fan speed - readings issue since day one, like yours. I replaced the small capacitor (it's a smoothing capacitor for the fan) next to the fan port and it got better, but did not go away completely. The other unit had no issues with the fan speed, it's rock solid, low or high RPMs. Units seems identical from the inside, but the fans are of a different brand. Maybe it has something to do with the "internal decoupling capacitor" inside some fans, as William Petty commented. Maybe we need to use fans without additional electronics build in, or something like that. That said, it does not overcharge the batteries, just set the max voltage a bit lower just to be sure.
re: 2. Both of my units developed a situation in which the detected voltage on the screen would raise greatly, depending on the current going into the battery. The voltage of the battery would not raise, of course. This was due to "dead" output smoothing capacitors on the output of the unit (the two identical large capacitors), and they would not filter the output from high-frequency induction currents (these units work at very high frequencies to do their conversion), so the unit would "read" the voltage unsuccessfully. This issue was completely fixed by replacing the said capacitors.
I actually have done a similar video a while ago on the 1st issue, which I sent over to the seller, who said that they would ship a new unit, which they never did and I lost some dates to claim a refund, but that's OK, learned a lot from this unit. Here's the link to my video: ua-cam.com/video/_219JrlbNxg/v-deo.html
There's also some info from my findings here: secondlifestorage.com/t-MPT-7210A-Questions though I ended up making the 80mm to 40mm fan adapter to just use a quieter 80mm fan at full speed, never did root cause/fix the fan PWM issue.
I wanna bay a similar charger for my 1.2 kw solar panel, which one do u sugest me?
The external fan you added likely draws much more current than the original fan. When the PWM is switching, (less than 100% on) the PWM switch generates very large current spikes. I have seen this before where these spikes will interfere with the analog elements of the processor and cause erratic behavior. If you add an RC filter between the fan and the controller, this behavior will likely go away. Some fans have a large internal decoupling capacitor and simple PWM circuits just switch the negative leg of the fan to ground. This will generate major ground currents in the PCB.
This also happens with the stock small fan as well, which definitely does lot more noise, because it's mounted right onto the aluminum casing and acts like a siren.
These don't have pwm. They change dc from the panels to AC then boost the voltage then convert the boosted a.c. back to dc to charge. It's a weird way to do it but it works. Now when you try to use this on 12volt batteries it never stops charging.
jesse serfling I was referring to the PWM fan speed control, not the solar / battery charging portion.
@@petski999 lol I see that now.
Connect the fan to its own supply?
Hi, I just have had à look to that, just reverse the fan and find the correct angular position to align the fan branch to the aluminum branch 😊 it is just bad mounting instruction at the factory...
lol it's just a terrible device.. chineseium at its finest
Put a resistor on the fan wire to slow the fan down and leave the fan set at full on the controller. The pwm of the fan is causing interference with the voltage sensing circuit.
THAT sounds like an easy fix!
It’s time for me to get mine out and try it again. Love your videos and information. Thanks for all your help.
I had mine set at 28.7 volts... came home from work to it still charging the battery at 29.6. Never knew about fan speed control, just took the whole side panel off and taped on a 60mm cpu fan. I think we're all expecting a little too much from one of the cheapest mppt charge controllers on the market.
you still want them to work safely - cheap or not
Desoldering braid (solder wick) and a soldering iron helps for precision desoldering. Great video, Bro.😎🤙
Kevin Oakes has the right idea with the big resistor inline. Put it physically in the air flow and it shouldn't get too hot to fail. But I really came here to say the back of that board triggered me! The gaps of missing solder on the high power traces feels bad. Please thicken those up!
Use solder wick to remove excess solder. Also a good quality flux gel helps the solder flow better for soldering and de-soldering.
Why not put the fan in something like a vacuum cleaner tube, far away from the scc, then attach the other end of the tube to the scc? You could even use a larger fan, (such as a computer case fan), powered some other way (such as from a 13.8V external power supply), and then either disable that small loud internal fan or use a resistor which would make it draw the same amount of power as the fan would have, putting that resistor in the airflow to help cool it.
too hard, the 3D printed fan mount makes it quieter *kinda
Hmm since the fan wants to be on constantly I will put in a relay circuit and pot and power the fan from the battery to isolate it. Also knowing why this thing needs so much airflow is kind of the first thing I want to know.
Cheap controller I guess. Fan is cheaper than heat sinks
Fan is cheaper yes but the whole case is a heatsink why not just desolder the heating component and rewired them
I had the input capacitor fail on mine. I was messing around with my new current probe and noticed massive input current ripple on the solar panel line. Replaced the cap with a really big one (63v 10000uF) and all is good again. Also the fan should always be run at 100% speed, if you need lower speeds then mod the fan with a series resistor (22 or 47 ohms).
Remove high frequency noise: I fixed the both annoying high frequency and amplitude of the fan noise significantly, by just using a small file and narrow strip of sand paper on the inside edges of the three fan guard supports on my MPT-7210A. From making flute I realized the sharp inside edge of the guard struts with the blade close by makes a pretty good whistle...... and might be source of high frequency..
The leading edge has most impact but rounding over both inside edges reduced]s the sound to the low intrinsic fan sound which is minor and low F.
I had to put my ear to hear it after the modification and it leaves the "guard "function inlace. Hope this helps someone else who's still willing to try this device.
Semantically
Outside MPT-7210A
\_/ Aluminum guard strut on case rounded over to inside(6X)
/ Fan blade rotation ->
Inside of MPT-7210A
Might be a help to others but this unit never lasted for more than a few weeks.
Hi I have one of theses to charge a ebike battery mpt 7210a but I have a quick question for thoses days when solar is bad ie cloudy. Can I just connect the mpt controller to a 12v battery to charge the 36v battery.
I HAVE JUST HAD THIS same thought and wondered if that would be a video trying to do just that.. How ever my crap charger died a sad lonely death a few hours after this video release.
Mine suffered the same issues.... however it turned out that it doesn’t like high voltage input to high current output.... as the model name implies, it’s only rated for 10A peak, while it’ll operate nicely at half of its rating.
Doesn't matter how I used it in for the input and output voltages - it's junk and never worked like it said it would on the box. (then it died anyway)
Disconnect fan. Does it work? If so use external 5V plug pack to drive fan
it works fine without the fan wired in? So just run the fan on an external power source until your ready to change/upgrade it.:-)
First guess I'd say the fan speed driver is coupling to charge circuit due to being over driven. If it only started these problems when you upgraded the fan, it would point towards that. Maybe try some bigger filter caps. Just a guess though.
Issue was there from the first time i fired it up :(
@@HBPowerwall Spewen. I'ts still more likely to be a coupling issue than a programming one though and you can't fix a programming issue. I'd try disconnecting the fan and running it from a separate power supply. After that if it still freaks out when you change the fan speed it's most likely a programming issue that a board repair can't fix.
Bonus points though for putting the fan on the right way round!
Hi Pete I also have one. The problem I have with mine is the MPPT tracking or lack of after clouds have passed over.
They need to improve this module for better fan management system and MPPT recovery from shading.
I don't think they are MPPT at all I was under the understanding they are boost/pwm configuration with a name that looks like mppt lol I think they are close to having a good product, but at the moment all they have is a cheap product
@@HBPowerwall They are MPPT, just not a very good implementation of it. However even with the basic MPPT implementation they are far superior to a standard boost converter for this application.
A Brick or a 4x5 stick will stop the fan from making noise!
Hell the cheap piece of junk would easily be stopped with a tooth pick..
Didn't want your opinion..just the max size wire??
Time for you to get off your ass and google it. Ooh and the price of the wire willl exceed the value of that charger.
10amp is that the solar input it can handle? or is that output , does anyone have recomendations for a reasonable prized unit that can handle 6-10, 100watt panels and can be regulated to charge 18650?
Hello, Why I can't get more charge power than 150W on the mpt-7210a regulator? In full sun, I connect 4x230W solar panels in parallel mpp = 29V Open circuit 40V. The rechargeable batteries are 48V 40Ah. The parameters set in the controller are 55V charging voltage and 10A charging current and mppt set to 29V. The regulator shows the voltage on the PV during charging 35V and the battery charging current 3A and the voltage on the battery 50V. The regulator should draw PV voltage to 29V and give a charging current of 10A which would give 500W.
What would the max voltage we would set if using this charge controller on a 24v sla system?
Please I want this scheme or a solar charging station circuit. Thank you, please
What’s the max size wires for the mppt
it's a CRAP device don't use any wire..
just use a boost converter that you can set the max voltage and current
that would work too
A boost converter will pulls the panel voltage down to 1-2 volts though, it won't work well connected directly to solar panels.
I'm having a possibly related issue with my 7210a just now, just hooked it up to 2 100W panels (parallel, 18V input) to charge a 48V 10Ah e-bike battery pack and the output seems to only ramp up to around 15W total output (like .1A out), and then it drops back down to 0 output, then works up again over about 20secs to 15W, then back to 0 again? The fan is set to 100% and i can hear it running the whole time. I gave up and just put the normal mains charger on the battery. Should i just go for a better MPPT charger?
Put it in the bin and make coffee - at least you'll have caffeen in your system to deal with the junk :(
Put half of your panels to series so total voltage is nearer to 48v.
Limit charging current to maximum panel power minus 25%.
Start running... This time it should be more stable. Mine did the same as panel voltage droped too low (like below 16v instead of 17.5)
This charger can charge litium phosephate Battery ?
Probably but to be honest it would do a shit job of it..
DROK MPPT Solar Panel Battery Charge Controller Color LCD Digital Display Boost Voltage Converter Regulator DC 12-60V Step Up to DC 15-90V for 24V/36V/48V/60V/72V 0-10A Battery Pack Charging
Hi Peter,
Your replies are making me better. I want to buy the above MPPT controller. It is good for charging my 7s 20P battery pack I am going to build. I do not understand still how many batteries=to 10A. Thanks for another reply to me.
I would not buy this one unless it's with in your budget, much better to buy a www.diypowerwalls.com/PCM60X costs more but MUCH better unit. This little green one died after about 6months of use
My fan speed does not change? Fast under all settings?...Crappy
Yep piece of rubbish
Same here with the most recent version I bought
this is not a fault of the device, the device was fine until you modified it.
Computer cooling fans are NOTORIOUS for injecting all sorts of noise onto PSU rails. EMI is what you are seeing here, generated by the fan, which should be obvious as it is only happening at settings
it was MUCH worse before I added fan it moved more than two volts back and forth and the unit was unusable in this location due to having to run the fan at 100 percent I'll try grounding it but don't think that'll help much
@@HBPowerwall how about sticking a 120mm fan, although much bigger and quieter, you might bring it down to 50%?
Use a quiet fan and let her rip.
that was the fan mod idea, it's much quieter and pumps a shit ton of air never even changes from air temp now lol that said still won't do more than 2.4amps charging even tho it has 20amps max panels on it
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Always cringe when someone is using a solder sucker, GOOTWICK FTW
Your pulling too much power with that Larger fan. Starving the other circuitry.
Was exactly the same with the smaller std fan
@@HBPowerwall What ever happened with it ?
it's still running but only charges at 2.4amps with 20amps worth of solar at 36v
That looks like a firmware issue...
*googles new firmware....
Lol
Just get a better MPPT charge controller :) It’s been doing it since you got it - clearly not up to the job.
But that's not fun!