On Aug 31, 9:35*pm, "JB" wrote:
It has been stated elsewhere in documentation not to hook a battery on the
output for backup.- Hide quoted text -

Anyone know why that comment "not to hook up a battery"?
Perhaps because to re-charge a nominal 12 volt battery at say 2.3
volts (max) per cell it requires 6 x 2.3 = 13.8 volts. Or even a
little higher; that's why military equipment was/is rated as '14
volts' (or, typically aircraft, 28 volts).