mack
New Member
Posts: 3 
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Post by mack on Jan 22, 2017 15:31:44 GMT -8
Question- I've got a 12v battery bank (8 6v 370ah batteries) wired series/parellel totaling 1480ah.. I've got 8 100w renogy mono panels, tracer 4215bn 40a controller. The panels bring the battery bank up to 100% in an hour or two on a good or fairly sunny day.
At night I turn my 2000w inverter on and only running 200-400watts of power usage. It seems like the soc on the batteries drain down to 50% within a hour or two..
According to my calculations the charge should last alot longer..
Batteries are only a year old.
Any suggestions?
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Post by jsb2000 on Jan 22, 2017 15:51:04 GMT -8
Question- I've got a 12v battery bank (8 6v 370ah batteries) wired series/parellel totaling 1480ah.. I've got 8 100w renogy mono panels, tracer 4215bn 40a controller. The panels bring the battery bank up to 100% in an hour or two on a good or fairly sunny day. At night I turn my 2000w inverter on and only running 200-400watts of power usage. It seems like the soc on the batteries drain down to 50% within a hour or two.. According to my calculations the charge should last alot longer.. Batteries are only a year old. Any suggestions? I'd like to see your calculations and a description of how your solar panels are wired. Some of your descriptions just don't jive, based on what I read. For example, I can't see how your solar panels would charge a battery bank with that capacity completely in "an hour or two." And a 40 Amp controller shouldn't be able to handle 800 Watts of solar panels. My best guess would be that you are not completely charging the bank and that the inverter is draining that shallow charge off. In other words...one or two hours of charging is roughly providing only one or two hours of usage. |
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mack
New Member
Posts: 3
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Post by mack on Jan 22, 2017 16:02:27 GMT -8
I have the panels wired in series parellel as well.. past few weeks with the cloudy days and rain (GA) they are typically producing 30-40v 200-250watts +-.. I've seen the charge controller sending up to 14 - 15v & as much as 20 amps to the batteries during the peak of the day under a load..
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mack
New Member
Posts: 3
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Post by mack on Jan 22, 2017 16:10:00 GMT -8
Correct me if I'm wrong.. 1480amp hours total.. don't want to go no less than 50% discharge so that leaves me with 740ah.
400 watts/hr for 8hrs = 3200watt. 3200watts / 12v = 266ah needed in an 8 hour period. That should leave me somewhere in the range of 80% by morning. Right?
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Post by jsb2000 on Jan 22, 2017 18:04:48 GMT -8
You said you have a 40 Amp controller. Let's assume you were, under ideal and overly optimistic conditions, able to get that full 40Amps for 8 hours. That would yield 320 Amps. Even ignoring the fact that you need to supply more than what you draw from the battery bank in order to fully charge it and equalize the cells, that's still nowhere near your 50% capacity of 740aH.
You said you observed "as much as" 20 amps to the batteries through the controller. I doubt that you're getting 8 solid hours of peak sunlight. So you're going to be coming in WAY below that 320 Amp number. Sorry, but I don't see how you can be sufficiently charging a bank that size with those parameters.
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Post by Tuscany on Feb 28, 2017 14:16:32 GMT -8
The way i see it you are using 266 ah each night and replacing only 100-140 ah each day and less than that on those cloudy days. So your batteries never really get fully charged. You may be charging them up to 70% and draining them back to 50%.that is very typical because we underestimate what it takes to fully charge them. Try fully charging them with a charger then start again with the solar and watch the soc decrease each day to prove what is happening. Remember fully charged can take 3-4 days!
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Post by lulanord on Mar 9, 2017 9:34:47 GMT -8
Hi...i am a new user here. As per my observation if you observed "as much as" 20 amps to the batteries through the controller. I doubt that you're getting 8 solid hours of peak sunlight. So you're going to be coming in WAY below that 320 Amp number. Sorry, but I don't see how you can be sufficiently charging a bank that size with those parameters. one-stop pcb assembly services |
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