6300BTU A/C? Yikes.
I am guessing that's running about 5A at 115V, which is about 50A at 12V.
If you think CU is expensive, wait until you calculate the battery required in a reasonably designed RE system.
The florescent lamp is nothing compared to the A/C.
Need to rethink power.
"I work alot and only use power for 8-10 hrs max a day now."
10 hours x 31 days = 310 hours max.
"running 3-400 a month"
$350 average.
That's near $0.50 worth of grid per hour, or maybe 3000W continuous 24/7?
Need to rethink how that power is used.
Time for more insulation, turning the temp up, programmable thermostat, white curtains on the windows, CFLs, turn the water heater down, attic fan, etc.
G-