He has powered his house for 8 years using laptop batteries (opens in new tab)

Jesus. No cell balancing, protection or monitoring that I can see, and most importantly - wires directly soldered onto the battery instead of spot-welded. That's a fire hazard waiting to happen.

People, if y'all ever build your own battery pack, please think about safety. Or if you don't, place a giant bucket of dry sand above the pack, with the bottom layer being made of acrylic or other plastic that melts. That's about the only thing that can stop a battery fire.

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.

Major selling point for official solutions by companies.

Their solutions need to comply to safety standards.

This is my main problem with having a battery in the house. Once sodium based batteries and compatible inverters get on the market I might switch them out to lower the risk of catastrophic failure and losing the whole house.

> unstable temperatures and scarce monitoring

You've described the worst possible place to locate them.

Build a shed, or a bunker!

I went to the comments to see if I was the only one who felt this way. I don't judge using AI to correct spelling or style issues, but this is just too much.

Read like breathless hype to me; AI makes sense. I just figured the author was fanboying too hard.

There is an inverter somewhere that converts the battery voltage to whatever you need to power stuff. 110v AC, 220v AV, 240v AC

No, it's in a shed.

Try it manually first, can't automate a process if you don't know the process yet. That will prove the business case too, with a lot less upfront investment.

The problem is that it doesn't scale; unless you have quality and reliability guarantees on the batteries, you won't be able to sell it in anything but unregulated markets, meaning that demand will always be low and investments in "smart AI robotics" will never earn themselves back.

It's not that much work, you just need an arc welder. If you're experienced, it only takes a minute.