Join Date: Jul 2007
Location: Windy Wyoming
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Don't worry about it. Any reputable charge controller (like Trace/Xantrax, Outback, Blue Sky. Morningstar, etc) knows what it is about. One amp six hours a day is only six amp hours, not enuf to overpower most batteries. It IS enuf to compensate for self-discharge, small parasitic loads, and to undo damage by sulfation on the plates. A nominal twelve volt battery is really not 100% charged until about 14.4 V. Be especially aware of state-of-charge meters that rely on voltage readings instead of on amperage shunts.
Any PWM charger will taper and float without damage to your batteries -- IF you have it set for your type of battery. See if the manual mentions different bulk/absorb/float thresholds for flooded lead acid, sealed gel, AGM, and NiCads. For example, sealed gels should not be high-charged or equalized; NiCads require charging at higher voltages than other batteries. If you are really scared, flip the breaker to the PV. It can be dead-headed without harm.