Recent content by OahuSolar
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BMS, other Q's: 36 battery 48 volt AGM system (!)
Back of napkin calcs suggest a need for humble expectations for kWh using these batteries at max 20% drawdown. I will power low watt LED's (about 50W), about 200W in networking hw, and a few 50W chargers. That would already be ~5kWh over 24 hrs. To be useful, I'll need all (36) of these 86Ah... -
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BMS, other Q's: 36 battery 48 volt AGM system (!)
Great, thanks Quattrohead. Looks like one will work for a single string of (4) in series. So, would I get two of these for a 4s2p setup? And if so, how do you balance between the two 48V strings? -
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BMS, other Q's: 36 battery 48 volt AGM system (!)
No answers so I'll journal a bit. After reading the Victron wiring doc, I'll start with a (16) battery setup in 4x4 at 48V. Total is 16.5kWh. Targeting 20% drawdown means I am aiming for about 3.3kWh. Enough for internet and lights overnight. These batteries charge very fast. So, a standard... -
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BMS, other Q's: 36 battery 48 volt AGM system (!)
Victron's wiring doc says I should limit strings to 3-4 (versus 9 as planned) due to difficulty in balancing. Makes me wonder if there's a solution that uses 9 in series (108V), but standard seems to be 48V.. Is there a way to reliably balance a 48V system in 4x9 w/ 12V AGM Lead Acid... -
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BMS, other Q's: 36 battery 48 volt AGM system (!)
First solar project. Budget sensitive. I will build a 4x9 36 battery 48V system out of 86Ah 12V AGM UPS batteries. Great shape but used. Won't last forever. Not deep cycle but should be ok for a starter battery setup. Price was right. Does a BMS make sense at all? Can I skip it for this first...