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Piwoslaw · 03-13-22, 03:54 PM

The wife recently came across some blog with people who use huge banks of old 18650 batteries (hundreds or thousands) from old equipment and appliances for energy storage, like a DIY Tesla Powerwall, but for a fraction of the price.

The ones I've seen claim that the more batteries you use, the lower the current running through them, which extends their useable life. This supposedly makes any safety risks negligible.

I admit that adding 10-20 kWh of storage to our PV system for the price of 3-5 kWh is tempting, but...

Just skimming through search results showed that some experimented with AGM batteries (instead of 18650's), but with worse results.

I haven't found anyone trying this with cellphone batteries, of which there are more and more in the waste stream.

Anyone here tried this, or came across anything interesting?

03-13-22, 03:54 PM	#1
Piwoslaw Super Moderator Join Date: May 2009 Location: Warsaw, Poland Posts: 961 Thanks: 188 Thanked 110 Times in 86 Posts	DIY Powerwall The wife recently came across some blog with people who use huge banks of old 18650 batteries (hundreds or thousands) from old equipment and appliances for energy storage, like a DIY Tesla Powerwall, but for a fraction of the price. The ones I've seen claim that the more batteries you use, the lower the current running through them, which extends their useable life. This supposedly makes any safety risks negligible. I admit that adding 10-20 kWh of storage to our PV system for the price of 3-5 kWh is tempting, but... Just skimming through search results showed that some experimented with AGM batteries (instead of 18650's), but with worse results. I haven't found anyone trying this with cellphone batteries, of which there are more and more in the waste stream. Anyone here tried this, or came across anything interesting? __________________ Ecorenovation - the bottomless piggy bank that tries to tame the energy hog.