Originally Posted by
DmaxMaverick
I had something similar with a solar powered driveway gate. The diodes on the charge/maintenance control board failed, allowing the panels to discharge the battery when solar activity fell below balance. I simply installed diodes inline from the panels, and the problem disappeared. Dirty, fogged (oxidized) or failing panels can act similar, failing to maintain sufficient power. Lastly, and most obvious, is a parasitic drain you may be unaware of. Turn off everything and check the circuit with an ammeter. Cover the panels and check the leads for a parasitic drain.
From his description, though, it sounds like his batteries aren't actually draining, but that his monitor is simply showing an incorrect voltage.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter