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Asbo dx-dc 1250 50 amp solar charge controller not charging gel battery fully

Reecebcooper

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Dec 3, 2021
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I have recently fitted all of my electric components in my van. I have my starter battery connected to my Asbo solar charge controller, my 500 watt solar panels and my Expedition lead carbon gel ultra deep cycle 12v 200AH battery.

I have all the settings setup but my battery doesn’t charge to 100%. When I have a look through my charger it shows at 12.5V, my channel 2 (solar) pulling in 33.8V and the charger being in Float charging stage and power supply mode. My battery monitor shows the battery at 97.4% charged and yet it won’t go higher.

Is this normal for a gel battery or am I missing something many thanks.
 

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Are you seeing current drop over your wiring?
12.5V, even for GEL, isn't a full charge. Does your charge controller put out the correct voltage for your battery type? 14.1-14.4 is used for gel, a little lower than FLA.

From what I've seen, GEL fully charge voltage is 12.6 to 12.8, so one would have to ask what your meter is using to measure a percentage of charge capacity. Perhaps it just needs to be calibrated to your gel charge state. Sometimes those controller meters are exactly accurate - did you put a digital multi-meter on the battery posts after it's rested?

My Tracer SCC isn't even usable for battery percentage - after resting, at 12.7 (full charge) the meter shows 58%. LOL
 
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