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I've bought a few BigBattery products over the past few years and they have been solid and reliable. (Although granted, I did not seek tech support from them....) A few months ago my email started receiving sale offers from Battery Evo that were full of "apparent" BigBattery products at massive...

Recently a couple of A123 lithium packs from a Smith electric delivery truck landed in my garage. They are really nice things: built-in BMSes, CANBUS control, and high energy density in space and weight. Disadvantage: odd operating voltages. They are 26S3P with a unique "proprietary" A123...

Soon I'll be into a project that will require voltages greater than the usual 48v seen in solar power. (It is an "extreme" case involving an old EV that ran lead batteries.) The plan was to get LiFePO4 cells to make up a 30S pack for 96v "nominal" and 109v max. Maybe 100AH to start. Source TBD...

https://honestenergy.substack.com/p/the-little-ion-that-could Worth the time--I've yet to see a textbook explain it so clearly.

This Register article summarizes the situation better than anything I've seen yet. Goes over all the major alternatives to lithium ion: magnesium, lithium-sulphur, sodium ion, solid state, etc. etc. We got lithium-ion thru a confluence of economics (Sony's idle thin-film factories converted to...

Oops I detect a throwdown.....

I know of a surplus dealer in California that has thousands of used commercial solar panels removed from service in commercial solar farms. Prices on many of them are a steal, most are older models and great if you don't mind dealing with "obsolete" MC3 connectors or nonstandard connectors, or...

https://bigbattery.com/product/48v-li-ion-power-pack/ It's made of Nissan Leaf cells, which I gather are used but test at 90% or more of new capacity, and have a good reputation for reliability (as far as I can tell). BMS, meters and temperature sensors are built in. This is a good capacity for...