PV solar system charging voltage low
Ok solar gurus - I am experiencing low voltage with my PV solar system. The charging voltage will not go above 12.8V. I'm using a Morningstar SS-6L-12V SunSaver controller (2nd gen) with 4 new Crown 6...
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The OP hasn't mentioned just how far down his batteries were discharged.
Amps out have to be replaced. I took a 250 ah bank down to 12.1v resting and put a 220w system on it for the 5 hours the sun was out that day. After 5 hours the voltage of the battery had only made it up to 13v while charging even though the system was putting out 12a. I had removed around 120 ah and even without losses the system had only replaced 60 at best. It would need at least 15 hours of direct sunlight if not more to be in float.
On the other hand, I've had my 95 ah grp 27 down to 12.1v and put my 230w system on it pumping out 15a and in 3 hours it was back in float. The system had no problems replacing the 45 ah needed.
So if you have a 440 ah bank down 220 ah and want to get the voltage up fast, you will need to be putting 45-60 a back in and that's a big system. 3 or 4 of my 230w panel for 690-920w would do it.
Amps out have to be replaced. I took a 250 ah bank down to 12.1v resting and put a 220w system on it for the 5 hours the sun was out that day. After 5 hours the voltage of the battery had only made it up to 13v while charging even though the system was putting out 12a. I had removed around 120 ah and even without losses the system had only replaced 60 at best. It would need at least 15 hours of direct sunlight if not more to be in float.
On the other hand, I've had my 95 ah grp 27 down to 12.1v and put my 230w system on it pumping out 15a and in 3 hours it was back in float. The system had no problems replacing the 45 ah needed.
So if you have a 440 ah bank down 220 ah and want to get the voltage up fast, you will need to be putting 45-60 a back in and that's a big system. 3 or 4 of my 230w panel for 690-920w would do it.
