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I am currently running 12x100w renogy monocrystalline wired for 120V, epever 40A MPPT charge controller with MT50, 4x Duracell SLIGC 115 FLA, 24V 2000/4000 psw inverter, 1800W generator, iota 27Vx40A charger in Southwestern Ohio. I use about one kilowatt a day. My PVs are currently generating 1.5 kilowatts per day, and these are pretty short days. I would like to get about 2 days of backup from the batteries in case of overcast conditions. If I don't get that I am easily able to fire up the generator. I am ready to replace my batteries, I was looking at 8 Duracell Ultra SLAA6-200c AGMs, wired for 24V. What more information do you need, or, what do you think of that?
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Last edited by Skunkarific; 01-21-2018, 04:39 AM. -
Correct me if I am wrong but isnt the Duracell SLIGC115 a 230 AH battery?
230 AH x 24v = 5.5Kwh. If we go by the 5 day reserve capacity based on your daily usage which nets you 2-3 days actual reserve.
1Kwh x 5 = 5Kwh. That battery should have met your 2 day backup requirement. Are you using more energy than you think?
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If you read the sticky posts, you will find that for the most part this forum recommends Flooded Lead Acid batteries for price/performance and to NOT put battery strings in parallel. This particular proposal goes against that rule of thumb.Comment
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Your terms and math need work. For one those batteries are 230 AH @ 6 volts. I assume you have them wired in series for 24 volts which gives you 24 volts @ 230 AH which yields a capacity of 5. 5 Kwh with 2.8 Kwh usable.
With 1200 watts of power you cannot support a larger battery, and never ever parallel batteries. Learn the difference between:- Power = Watts
- Energy = Watt Hours
Last edited by Sunking; 01-21-2018, 02:58 PM.MSEE, PEComment
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Well, thanks for the advice about not putting the batteries in parallel, why is that, BTW?
Also, what would be wrong with using AGM batteries as opposed to FLA?
I am definitely sure about the amount of energy use. I do want more storage. And yes, the batteries I have are currently wired in series for 24 volts.
What would be wrong with having more storage if I made sure that the batteries got charged fully?Last edited by Skunkarific; 01-21-2018, 05:27 PM.Comment
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cons of parallel batteries covered here http://www.smartgauge.co.uk/batt_con.html
pros: quick & dirty & easy (always easier to do it wrong, than right)
AGM batteries, you are paying $$$ for spillproof aircraft batteries, that seldom last as long as a flooded version.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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I looked at the link you posted, it shows three ways to successfully wire batteries in parallel. I am done doing things quick and dirty, I think I'm definitely on the path to doing them right so I definitely looked at that link. Am I missing something?Comment
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It does indeed, show ways of wiring batteries in parallel. You can also never flush a toilet, and just spray room freshener after every use.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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I'm supposed to flush?
Seriously, though, I'd like to get more capacity, any suggestions? Not to many choices above 230ahComment
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It would have been better to have asked, "Where have you looked?", Instead of saying that I haven't. I have personally visited three different battery distributors in Cincinnati, which is an hour drive away, so, I have about six hours in driving and about four and a half hours in looking.
I am aware of 2 volt batteries, and really like them, except that I would need 12 of them to get to 24 volts for my inverter. White wolf, I did look up that series of battery, which up to your comment did not know existed, and, believe it or not, I found them at Lowe's for $149 a piece. That is fantastic, and exactly what I needed.
What do you think?
https://m.lowes.com/pd/Deka-6-Volt-4...iABEgIWG_D_BwELast edited by Skunkarific; 01-22-2018, 09:13 PM.Comment
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Yes it makes a pile of chit not stink as bad, does not make it smell like a rose. Basically a a band aid for people who screw up and already bought batteries. There is absolutely no reason to ever parallel batteries in a home battery system. They make FLA and AGM's anywhere from 10 AH to 6000 AH.
As for AGM vs FLA, well AGM is 400% more expensive. They cost twice as much and last half as long as FLA.
MSEE, PEComment
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