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I see some ads on Craigslist, but my sense is that the surplus EV batteries there are quite old, and heavily used. Are there low priced, useable LiFePO4 batteries coming out of US cars? The choice on the forum seem to be people buying new EVE cells direct from China.

I'm re-using a steel control box from an old electric kiln, and realized the power cord contains 3 six foot sections of fat copper wire. It was 240V so 2 were hot and one was ground or neutral.

We're having flex alerts every day now, between 4PM and 9PM. I charge all day, and start my inverter right before 4 PM, then get a credit of $2/kWh for the electricity I save. My inverter is in a shed, with outside temperature up to 104°, but is running fine. The batteries, at 9PM, are still at...

We're having flex alerts every day now, between 4PM and 9PM. I charge all day, and start my inverter right before 4 PM, then get a credit of $2/kWh for the electricity I save. My inverter is in a shed, with outside temperature up to 104°, but is running fine. The batteries, at 9PM, are still at...

This time last year the cost of electricity per megawatt-hour (MWh) in both France and Germany sat at around 85 euros. On Friday, both countries set record highs, with the cost climbing by at least 1,000 per cent from last year to €850 in Germany and over €1,000 in France, Le Monde reports...

California is in a heat spell, and a/c is running full blast. As an incentive to save electric power, PG&E is offering a $2/kW credit for energy you save tomorrow, during 5 peak hours. https://powersaver.pge.com

800W of panels on the roof of my shed, a Renogy 20A Rover charge controller, two 24V battery banks. One bank is LiFePo, the other lead acid. I put a switch on the wall (red handles) from the separate battery banks to the inverter. The inverter is a 24V low frequency, split phase inverter that...

I will be trying to start a deep well water pump and will be building a super capacitor bank to provide a short power boost. The bank will be about 350 Farads @ 30V, which works out to 5000 watt/seconds. This means I have the potential for a 500 Watt power boost for 10 seconds? Watt/seconds =...

These are not mine, but seem like a good deal Solyndra Solar panels 7ft X 4ft 210 watt new never used. $55 each panel 100 in stock

One of my battery banks is lead-acid batteries, and I used it today, charging with PV panels while also powering my inverter. I've read lead-acid shouldn't be discharged lower than 50%, so I was monitoring the battery charge on my solar charge controller. I removed the inverter load when the...