> So how would I do that with these two deep cycle RV batteries I've 
 > got sitting here to make them last longer?
 > 
 > Mostly I've just been maintenance charging them,  every so often,  
Roy,
 Much of the information I got on equalizing batteries came from Home Power 
Magazine. The one article even gave the specific rate of overcharge:
C/5 -> C/10 for 5 hours or so. The 'C' is capacity in amp-hours. My 
RV/Trolling batteries that I use on my UPSs are 105 Amp-hours, so I charge 
them at 5 amps for 5 or 6 hours once per month. Before charging them, I check 
the voltage under load with my battery tester, check the fluid, topping off 
with distilled water, and recording the battery tester readings.
The UPSs keep those batteries charged at 13.5 volts, but that's insufficient 
to equalize the cells.
The equalization requirement is one reason why most home power folks have a 
generator set.
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