5w 15v solar maintainer
I just went out to the TT to start getting it ready for our next camping adventure. Currently it only has the original Interstate Group 24 Marine battery on it (the Deka's and Unisolars seem to be enj...
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I would put a load on the battery for about 5 minutes, and recheck the voltage.
A surface charge would disappear. The same reading means your meter is reading high. I would replace the meter, or at least the meter's battery. If it's still 12.90 volts, get a better meter.
By the way, if you remember back in March we were discussing upper limits of voltage for charging batteries under different temperatures. My Schumacher SC-12000A Speed Charger reached 16.1 volts while finish charging between 90% and 100% (full cutoff) when charging @35F ambient temperature.
Last week I got chances to recharge the battery twice. The first time the charger reached 15.7 volts after 90% @ 65F ambient temperature. The second time the charger reached 15.3 volts after 90% @ 82F ambient temperature.
While the charger does not have a thermistor to read temperature, it does use programing to limit the maximum force (voltage) output to keep the battery from over-heating (per the manual).
Mark B.
A surface charge would disappear. The same reading means your meter is reading high. I would replace the meter, or at least the meter's battery. If it's still 12.90 volts, get a better meter.
By the way, if you remember back in March we were discussing upper limits of voltage for charging batteries under different temperatures. My Schumacher SC-12000A Speed Charger reached 16.1 volts while finish charging between 90% and 100% (full cutoff) when charging @35F ambient temperature.
Last week I got chances to recharge the battery twice. The first time the charger reached 15.7 volts after 90% @ 65F ambient temperature. The second time the charger reached 15.3 volts after 90% @ 82F ambient temperature.
While the charger does not have a thermistor to read temperature, it does use programing to limit the maximum force (voltage) output to keep the battery from over-heating (per the manual).
Mark B.
