CHEAP DIY 2kw Adjustable Solar Array For My Off Grid Homestead
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- Опубліковано 16 тра 2024
- I'm building a large upgrade to replace my 800watt panels and 12 volt batteries. this wasn't quite enough to keep my fridge powered for more than a day or 2 with clouds. And Now with Jon moving onto the property as well he will need some power too. so we're adding another 1200 watts of solar panels to the system and upgrading the batteries to 24 volt Lifepo4 batteries.
I made sure to make the panels adjustable so that they could get the maximum sunlight in all seasons. - Розваги
Having built one of these myself I would suggest the following. (1). Ditch the cheap charge controllers they will cook your expensive batteries. Go Victron its worth it, you have the option of using a Rasberry Pi to manage the system and you can add relays to automatically turn things on and off using logic rules for example turn on a heater/cooler when the battery is full. Victron can also be set not to charge your batteries when its too cold. (2) voltage drop is always going to be in issue over that distance so why not connect both solar new solar arrays in series and send 200v 2a up the hill to the shack and have the inverter and battery bank there. That way the battery bank will be kept warm in your heated living space. Voltage drop increases with the current draw. (3). Lay the cable in conduit. (4). would have been better to connect your 2 new arrays together and counterbalance it in the middle rather than hinge and the bottom, that way you can make 1 much stronger frame. (5) and this is the big one get that thing properly anchored into the ground or it will blow away in the first storm. - With solar they are called opportunity loads rather than dump loads, you will need a way of testing the generation conditions by turning on a load and seeing if there is enough solar generation to run it without putting the battery into a discharge state. Also Bi facials are expensive, used 260W panels are super cheap now so much so I have used them as a roofing sheet rather than buy OSB and felt. Good luck with it
Yeah an electric water heater would be that giant electric draw you were talking about.
Great idea!
I live in Tucson, Arizona. We have so many rabbits rats and mice and chipmunks. I have a small ac unit in a pottery studio next to our house. On the regular I spray Pine Sol or peppermint water around the outside unit to keep the rodents from moving in. So far, (7 years) no big issues, it has kept them away. FYI. 👍👍🌵🌵🌵🌵
Oh that's some Michael Kiwanuka playing at 1:50. Loving to see the progress bro, keep it strong!
Mount some reflectix on a sheet of OSB or plywood and place on the ground under the back of the panels.
If you placed mirrors under the array you could bounce sunlight onto the back of the panels.
Electric water heater is a great dump load and gets you free hot water, or at least helps to heat it. heating elements are available in any voltage and cheap it's easy to convert them.. You went to a lot of trouble to get max from your panels and it's getting wasted with the cheap controllers.. Get MPPT controllers.. You seem to have all the basic info and you'll learn about implementation as time goes.. You SHOULD Shower everyday.. AND, hinging the array in the center (like a teeter-totter) instead of the bottom hinge like you did, makes them much easier to adjust the angle every month and also to dump the snow if needed.. possible problems Blue tarps are NOT water-proof.. keep an eye on it... That 12 ga wire is going to catch fire.. make sure it's fused and feel it from time to time,, if it gets hot,, you have to do something. Wire is expensive so always keep an eye out for deals new or used...
The tarp was replaced shortly after the video. I just didn't have the money for the metal roofing I needed. Also the 12 Guage wire is more than capable of handling the load I'm putting on it. It doesn't get hot at all. I read the spec sheet
You don't need a dump load, you just need to configure your charge controllers properly. I see you are using several different charge controllers and if you are triggering an overcharge condition and the BMS is shutting down, then lower the charge settings by maybe about 0.2v on each controller. Those cheapy blue PWM controllers are terrible for this and quite often allow way more voltage out to your batteries than they are supposed too. I've had to throw away a few of those things because of the voltage spikes getting through. I know money is tight, but I would switch that out ASAP with something a bit better or eventually they are going to ruin your batteries if they are over charging... But all this dump load talk is not what you need to do and is more necessary with really old wind turbine type stuff. Get a REAL mppt (not one of those blue ones that look the same and are marketed as MPPT because they are not). Good luck.
As far as i know even with a nice mppt charger if the battery is full the power still needs somewhere to go and would still need a dump load. Mppt only increases the efficiency of the charging
Awesome project.
A few comments.
A single 60a output MPPT would handle all your panels if they are charging a 24v lifepo4 bat bank. I installed a Makeskyblue one on a boat, which now costs $85- $100 and can handle 1440w PV power going to 24v bat bank. Generally 95% eff and max PV voltage around 110vdc- so wiring with serial /parallel arrangement is needed. There are other brands as well. The PWM? controllers are efficient in some ways, but waste pv power if the voltage is more than approx 30% above the bat voltage (32v to maybe 36v for a 24v bat bank)- so if PV voltage going to a PWM is over 32-36v, you are losing charging power.
Bifacial a good idea- more power per sq ft and they tend to shed snow when sun starts to shine- reflected sun hits bottom of panel, produces power and heat and heat melts snow. Some DIY solar homeowners have found a combo of angled bifacials and vertical ones (one side faces E, other side faces W) improves the overall system efficiency by catching early morning and late afternoon sun.
Use shou shogi ban on your wood to keep it from rotting.
I would have took the money for cinder blocks and got ground contact 4x4 and some concrete to go with your cement mixer in the background and concreted those into the ground.
It was winter and the ground was frozen so I couldn't dig or pour concrete. But this seems to be working well
Fuck yeah, just left the Matrix
Hell yea brother!
Good job on the video. Helpful. May i ask what size refrigerator?
I believe it's a 3.2 cuft mini fridge
The invertor on top of the battery is scarey. How about below? Since you cranked it up to 220 volt how do you run the fridge. US 220 outlets use to hots and a neutral. Did I miss the 220-110 at the shack?
There's an inverter on both ends. One to step up the power to 220 and then another to bring it back down to 110 at the house
build a control circuit. screen
For the excess energy problem, couldn’t you just have a switch disconnect the panels automatically over a certain battery charge percent?
why? charge controllers do exactly that already.
Id need some kind of circuit to detect the battery voltage and disconnect and reconnect from the system. that takes some doing
those panels will continuously make power and if the batteries are too full for the charge controller to send the power. the power has to go somewhere. It could potentially fry the controller or overcharge the battery.
@@janklabs so why do you use CHARGE CONTROLLERS at all?
@@broniusale5987 The controllers convert the voltage to what the batteries need and monitor them.. The extra energy can be dumped into something useful.. An electric water heater is perfect
A cheap power dump would be a hot water heater. Wire it up with a circulating pump in a closed loop system. When the batteries get full it powers the hot water heater and the pump which will circulate the water to cool it down so it can be heated again. Of course you need the right charge controller to control this circuit and an insulated building for winter time unless you put the water heater in your house. I saw it done in a foreign country where the whole village ran power from a water generator system consisting of three water heaters, one for each generator. Of coarse their system took the water from the river then dumped the hot water back into the river.
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The insulation you installed in your battery compartment wont do ny good if it has air infiltration. If air can flow around the insulation it will be worthless. that compartment must be air tight.
It is very tightly packed with multiple layers of foam.
save yourself a lot of heartache and money. mpp sploar makes all in one units. EG4 also makes all in one units. i spent a fortune on solar . and ill swear by mpp. i bought 2 units and 5 years in. best bang for the buck. i got 26kw worth of batterys now. and 3 units. one is a growatt. its junk. lol. they run ac units all summer and heaters in the winter, as well as freezer fridge computers. its been a long road and a lot of wasted money getting here.
Most people watch solar videos to see the wiring 🤣. I'm just saying.
This was More about the design of the adjustable panels. I'm a novice at solar and there are many experts on UA-cam that can explain how to wire a system better than I could.