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babyeatingpsychopath
Oct 28, 2000
Forum Veteran


beep-beep car is go posted:

"a generator, but batteries instead".

This is known as a UPS. Batteries + inverter = win. Line-interactive UPS systems have a switch that lets you flip over to the batteries when power goes out. Double-conversion is where the grid is powering your battery charger and your batteries+charger are always powering your inverter to power the load. This is how phone company stuff typically works, since they want zero downtime switchover, and double-conversion stuff gives very clean power. Line-interactive is what hospitals and stuff use, since they've got point-of-use batteries for stuff that needs it.

Now, you can do this yourself with a big bank of batteries on a charger, then an isolation switch and inverter for the house. Off-the-shelf solutions that will power a house run at about $700/(hr of runtime), give or take.

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babyeatingpsychopath
Oct 28, 2000
Forum Veteran


surivdaoreht posted:

Hey folks,

I have a new to me solar setup in a cabin I purchased, and the batteries are inside. They’re two deep cycle marine batteries, flooded style. I’m worried about whether they should be outside, in case they put out dangerous gases.

I was thinking batterie box, but then I got to thinking about temperature issues in the various different temps we experience here (-40C ish all the way to plus 40c) thoughts?

The cabin is well insulated so I was wondering about seeing if I could vent the batteries where they are now and maybe build a small enclosure or something of the sort.

Appreciate any insights thanks

The only dangerous gas you have to worry about is hydrogen if the charging gets way out of control. With a competent charger on the batteries it's not an issue. Hydrogen is really only a problem in enclosed spaces. If the batteries are just sitting in the cabin, you're actually safer than if you were to build an enclosure for them. If you do end up building an enclosure, a small vent to outside would be fine, as long as the vent can't get clogged by bugs.

Lead Acid batteries do best at around 20C, and fully charged batteries freeze around -40, discharged batteries freeze near 0C.

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