Specific Powerwall build

gregory21greg

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Dec 8, 2017
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Hi all. I am building a powerwall of sorts. Not for my home but it is the same construction just smaller. I need something that can be charged by 3 100w solar panels effectively (it should be able to charge in 6 hours or under with no load)and have a capacity (I'm not 100% sure on this but I'm sure I can always add batteries in series to increase capacity)of 30Ah. I also want information on what cells, where to buy the cells, and the charge controller. I have a budget of like $300 to $500. Obviously the cheaper the better but I don't want to be unrealistic.
Oh and the load and solaris all 12v.

Thanks :)
 
You want 12V at 30Ah, so we are looking at 360Wh of energy. 12V isn't great, better go for 24V/15Ah. WIth new cells that will be something like 7s5p with 3000mAh cells. 35 cells will cost about 140 EUR. Charge controller, well, most of the cheaper units can't handle lithium cells. You have to look into this and maybe use a BMS. A single 100W panel is enough to charge this battery in well under 6 hours if there is decent sunlight. Panels costs about 1 EUR per watt.
 
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