I concur with Phil. Gelcells are the true maintenance free battery of
choice for a ham shack. I have run my ham shack off 12V gelcell battery
banks for at least 25 years. I have always simply floated the battery
with a regulated 13.6V 4A power supply. It charges the battery as needed
and floats it at 13.6V when the battery becomes charged; no danger of
overcharging. If the power goes out, there is no need for switch over . .
.. shack is still running off the battery. About every 6 or 7 years I
replace the battery(s).

More recently I have pulled the AC power supply off in favor of 55watt
solar panel with home brew regulator ..... set for 13.6V max. Still works
like a dream.



Ed K7AAT