He has powered his house for 8 years using laptop batteries

Re:He has powered his house for 8 years using laptop batteries by hengheng on Tuesday May 27, 2025 @05:55AM (#44105434)

Old laptop cells are going to need a lot more babysitting than a new LiFePO4 rackmount battery. Those generally do pretty well with the internal monitoring that they bring. Semiconductor fuse as overcurrent protection, passive balancing and monitoring of individual cell voltages seems to get you pretty far. Get your 48V or 51.2V battery in 5 kWh, 10 kWh or 15 kWh cell size from one of the Chinese outlets in dubious quality, or from real brand names like Pylontech. RS485 is usually present and there are kludgy home-assistant gateways, but they're not required for safety.

External monitoring is made by Victron, who initially did electrical solutions for boats. Their inverters are also very popular and pretty great.

Also, brick walls are kinda nice I have to admit, along with an exhaust for any fumes.

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Re:He has powered his house for 8 years using laptop batteries by desman on Tuesday May 27, 2025 @10:26AM (#44107336)

yep, I have brick walls downstairs where space is more scarce, the attic has lots of space but also lots of wood lying around.

I guess another possibility is to have the battery pack outside, attached to the brick wall, and ideally away of direct sunlight... but then no wooden roofs. It looks like no DYI is really feasible except maybe a concrete bunker as others have suggested. And even then it's probably uninsurable which is considered a no-no where I live.

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