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The tesla power wall is a rip off.
If you only want backup power a generator is better.
If you want to go off grid and live in a manor that resembles normal life you don't want a power wall.
If figure my leaf battery will hold around 20kwh and only cost me a deposit charge or around $1,000 to $2,000.
So far that's the cheapest way I have found to get kwhs.
Lead acid about $200 per useable kwh for a used forklift battery.
When I say useable kwh that really means 2 kwhs because if you regularly use all your batteries kwhs it will be dead in about a year.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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