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True. My parents actually have their apartment wired for "power groups that can run on inverter" and other power groups that will be without backup. Their power
by reacharavindh 4y ago
True. My parents actually have their apartment wired for "power groups that can run on inverter" and other power groups that will be without backup. Their power needs are substantially lower than an average American and European household. That is why I was wondering if this idea could be _scaled_ up.
I would not go around recommending anyone to buy Lead acid battery banks today. I'm in the midst of getting rid of the ones at my parents' too.
However, I found these LFP batteries where I live - NL for about 1K Euros [1] . They are 2.5KWh. Two or three of them and an inverter ought to be a good as reasonable backup for an American house dont you think?
LFP batteries dont catch fire like the Li-Ion ones tend to. No worries about oil maintenance. They come with 10 years of warranty. What is a downside to this that I am missing?
[1] - https://greencell.global/en/lifepo4-batteries/4097-lifepo4-battery-200ah-128v-2560wh-lithium-iron-phosphate-battery-photovoltaic-system-camping-truck.html#specification https://greencell.global/en/lifepo4-batteries/4097-lifepo4-b...
- dreamcompiler 4y agoThe only 2 disadvantages of LFP batteries are that they're a lot more expensive than lead-acid and heavier than Li-Ion for the same energy. But they can withstand many more cycles than Li-Ion without wearing out. If you can afford LFP, they seem ideal for a home backup situation.
- ericd 4y agoIt can certainly be scaled up, there are lots of models of 5 kwh lithium iron phosphate battery packs in server form factor for ~$1500-2000, 6 of those in a server rack and you have 30 kwh for ~$10k.
- reacharavindh 4y agoOh wow that sounds like a great way to convince the wife to let me have that homelab :-) By any chance you have any links to share for my research?
- ericd 4y agoThis one’s pretty popular: https://signaturesolar.com/eg4-lifepower4-lithium-battery-48v-100ah/ https://signaturesolar.com/eg4-lifepower4-lithium-battery-48... And is made to work well with this kind of inverter: https://signaturesolar.com/eg4-6-5k-off-grid-inverter-6500ex-48/ https://signaturesolar.com/eg4-6-5k-off-grid-inverter-6500ex... (They have a smaller 3 kw inverter for about half the price)
- jimmyjack 4y agoCheck out diysolar forum. Google it. Lots of very good information. Also watch Will prowse on YouTube.
- ericd 4y agoSeconding this, Will’s channel and forum are excellent. Here's a nice overview of setting up a 30 kwh battery and inverters to charge/use them: https://www.mobile-solarpower.com/48v-complete-system-blueprint.html https://www.mobile-solarpower.com/48v-complete-system-bluepr...