Regardless of what "code" may say, by asking the question I assume you already know that it is a good idea or at least couldn't hurt. Since I'm only at my off-grid location, my CC and inverter are installed on a Durock sheet with an Durock cover, never hurts to go beyond code requirements.
A DIY Power Wall ???
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Isn't that common knowledge? All other things being equal ... cycle life, from lowest to highest is ... FLA < AGM < Li-Ion < LiFePo ...
I mean ... you might be right in saying that FLA can have 1000 at 1/4 the cost ... but then doesn't a GOOD LFP have 3000-5000 cycles? Essentially, 4 times the cost for 4 times the life?
I'm definitely still learning, so am keen to see some good solid data on all of the battery options ... it's sometimes hard to separate the chaff from the wheat when it comes to data on batteries it seems?
The best LFP battery money can buy is A123 Systems, and they only claim 1000 cycles but fail to provide anything more than a 1 year warranty. A123 Systems batteries will run you $1.50 per watt hour. On the other hand a top of the line Trojan Industrial battery will provide 3000 cycles @ 80% DoD and comes with a 10-year warranty and cost on the order of $0.20 per watt hour.
So if you were to take say a 6-volt 400 AH Trojan Industrial battery gives you 2400 watt hours of capacity and will cost you roughly $500 with a 10-year warranty. Want that in a quality 6 volt 400 AH LFP battery? That will cost you $3600 plus you will need to fabricate a case and use an expensive BMS to make it work so in the end cost you about $4000 with a meaningless 1-year warranty.
So I say go for the LFP, you deserve it and will learn something.Last edited by Sunking; 12-24-2018, 08:24 PM.MSEE, PEComment
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