Hi all, I need some advice for my off-grid system. When the FM80 charge controller reaches the setpoint for absorb, for my battery system is 59.2v, will stay there steady, but when a load is applied to the inverter, let's say I use a drill for a a minute or so, the voltage in the charge controller starts to bounce back and forth overshooting the setpoint, the fluctuation is between 58v and 60v and keeps doing this thing for long time until the program changes to float, then it will remain there steady with no voltage fluctuation, is this normal for this charge controller? Any advice will be appreciated |
Voltaje fluctuation during absorb
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Voltaje fluctuation during absorb
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What size wire do you have between the CC and battery?
what size and type is the battery?
do you have the temperature sensor on the battery?
OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNH -
Hi, the wire is size 2, the batteries are deep cycle flooded 110 ah, yes I have the temperature sensor.Comment
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I have a similar problem but when i overvolt it trips my inverter ,sometimes.My Thought is to get away from a battery that needs such a high abs charge. I have batteries now that float only so they float all day @56v. Problem has been solved for me.Even some agms dont need such a high voltage. When I ran my trojans I set my abs v @ 59 instead of 59.3 and charged for 4.5 hours instead of 4h
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how old is the battery?
I assume you checked/cleaned all your contacts between CC and the battery?
do you have DMM to confirm your CC readings?
you see, the battery output resistance is less than 50 mOhm. To jump by 2 volts it would require change in charging current by 2V / 0.05 = 40A which is probably full charging current at that moment. This would in turn mean you might have bad contact somewhere between CC and the battery or between PV and CC - anywhere in the charging current path.Comment
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