I made a charger using a TI BQ2031 IC
First, read this: http://handybobsolar.wordpress.com/the-rv-battery-charging-puzzle-2/
Is the battery that is being charged also being drained by some load, or is the Solar Charger just to keep a battery fully charged by trickle charging it.
...Its quite possible that there simply wont be enough power available to provide the bulk charging and equalizing currentswhen you want them..
how much is the DOD of the battery overnite
I have some experience with solar. Here is an Maximum Power Point Tracker for $20.http://www.ebay.com/itm/MPPT-10A-Solar-Regulator-Charge-Controller-12V-24V-Autoswitch-Solar-Panel-/121013495990?pt=LH_DefaultDomain_0&hash=item1c2cf768b6
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via Egeo 16