Homebrewed Electricity > Solar
looking for cheap, true mppt solar charge controller
joestue:
i recently took my chances and bought a 67$ 20 amp unit off vevor.
https://www.vevor.com/mppt-solar-charge-controller-c_10732/vevor-20a-mppt-solar-charge-controller-12v-24v-auto-dc-input-solar-panel-regulator-charger-with-lcd-display-temperature-sensor-cable-for-sealed-agm-gel-flooded-and-lithium-battery-charging-p_010254593392
looks like this one was cheaper.
https://us.easunpower.com/products/easun-power-20-40a-mppt-solar-charger-controller-12v-24v-battery-and-solar-panel-solar-charge-regulator-pv-input?variant=46747612053811
then there is this one
https://hqsolarpower.com/20a-mppt-solar-charge-controller-with-parallel-charging-bluetooth/
or this one
https://bateriapower.com/products/mppt-solar-charge-controller-20a?variant=46991413838116
any thoughts? i'm not expecting much.
i have 3 panels but will get a 4th one from my brother which should give me, in theory, 50-60 volts at 7 amps, from 4 panels in series/parallel.
its unlikely i'm in a good enough solar region to justify buying 16KW of used solar panels for 6-7K usd delivered.
dnix71:
The Vevor unit comes with lightning, reverse polarity and other internal protections that I would not want to be without. It looks like a deal.
HQ Solar's LiFePO4 12v 100ah battery looks good, too. The price matches eBay prices and is about 1/3 of what Home Depot wants. I wonder if you can start a small car with one of those and what the life expectancy would be if used for that purpose. If it would power a small car, it would be cheaper in the long run in hot climates like south Florida than a lead-acid wet battery.
tanner0441:
Hi
100Ah I would think will start any car you put it on, but I don't give much for the batteries life unless you do something with the alternator which is set for lead acid charging parrameters.
Over chargind a lead acid battery will initially boil off electrolite and may kill the battery. Overcharging a Li battery may kill the battery and the battery may take the car with it.
I had a Li tool battery and coudn't lay my hands on the correct charger so I fiddled a couple of wire onto it and connected it to an old world 8A battery charger the first I was aware of a problem was a very loud hiss followed by a louder bang and the battery case split. 18650 batteries have a rupture pressure of some 450psi. Ryoby were more than happy to sell me a new one. I was told I was lucky it didn't catch fire.
Brian
clockmanFRA:
Have a look at these chaps for a good cost home built MPPT controller.
Its the whole story so sit down and get comfortable.
https://www.thebackshed.com/forum/ViewTopic.php?FID=4&TID=12027
150V 45A MPPT - roll your own
And yes some really know what they are talking about.
bigrockcandymountain:
--- Quote from: joestue on October 18, 2023, 04:35:53 PM ---its unlikely i'm in a good enough solar region to justify buying 16KW of used solar panels for 6-7K usd delivered.
--- End quote ---
You might want to check out skid prices on new panels. I see some offers of 50c Canadian per watt, which is about 35c usd. That's new, mono, tier 1 panels.
The last skid I bought was 56c per watt cad.
At those prices for solar, you don't need to be in very good solar country for them to work out.
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