I did a off grid calculator by http://www.altenergydesign.com/offgrid.html and it comes up with 48V 906 battery bank amp-hours with a 3 string set up of 302 per string. When I look at batteries I see flooded lead acid batteries around 200Ah. Does that mean I need just a few batteries for the whole system?
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I'm confused, how many batteries do I Need?
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That seems like a lot of batteries. My guess is you're in forklift battery territory.
With your 48 volt, 906 AH, I assume that's daily usage, so you want between two times that 1812 AH to avoid going to 50% depletion, and 2718 AH to go one cloudy day.
906 AH at 48 volts is about 32 golf cart sized 6v FLA batteries. I only mention 6 volt batteries is because my system I have four of those to power my RV a couple of days without a recharge. 6v are light enough at 65 LBS for me to take in and out of my RV as needed.Last edited by chrisski; 11-16-2020, 03:18 PM. -
For a full up house without air cond or forced air heat, I have a 48V 800ah bank. Power is expensive
Batteries in series add Volts. and the amps stay the same ( 12V 200ah battery, 4 in series is 48v 200ah)
batteries in parallel add amp hours, 12v 200ah, 4 in parallel = 12v 800ahPowerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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The other question is if I can add a small wind turbine to augment the panels during night hours and windy cloudy days. The turbine would be the same voltage as the panels. Our location is always windy so I thought this would help with reducing battery bank size by not having to factor in extra cloudy days for my panels. Any thoughts?Comment
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Originally posted by Dante3117 View Post.... Our location is always windy .....
Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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Originally posted by Dante3117 View PostThe other question is if I can add a small wind turbine to augment the panels during night hours and windy cloudy days. The turbine would be the same voltage as the panels. Our location is always windy so I thought this would help with reducing battery bank size by not having to factor in extra cloudy days for my panels. Any thoughts?
I have seen some turbines on a lake front property or on a boat but even they may not perform as well as the solar panels.Comment
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