I want to create a standby 12v dc power source for my shop. (Jump-starting, testing winches, etc.)
I want it to be very simple, & rugged, with as little silicone if I can manage it. It doesn't have to be
fancy or the ultimate in efficiency or sophistication. I have a large transformer out of a UPS
with a 30A rating, a 50A full bridge rectifier, heatsink, and two 6v deep cycle golf cart
batteries. I do not anticipate any smoothing with capacitors.
Under 20A of load, the transformer drops to 12.95v DC. With a .25A load, it's voltage is 13.5V .
No load voltage is around 18v, and drifts around. I would stay this transformer is very "stiff".
If the float-voltage for a 12v lead acid battery is 13.6v, it would seem I could permanently leave
the transformer/rectifier hooked-up to keep the battery bank float charged without boiling the electrolyte.
Yes/no?
Second concern, which I believe is negligible, but maybe someone could advise, is if I were use a large
load for an extended period of time, in excess of the maximum charging current, so that the battery
was discharged to a condition of 10.5v, would the resulting bulk charge-rate exceed or overload the transformer?
This would only occur rarely.
I want it to be very simple, & rugged, with as little silicone if I can manage it. It doesn't have to be
fancy or the ultimate in efficiency or sophistication. I have a large transformer out of a UPS
with a 30A rating, a 50A full bridge rectifier, heatsink, and two 6v deep cycle golf cart
batteries. I do not anticipate any smoothing with capacitors.
Under 20A of load, the transformer drops to 12.95v DC. With a .25A load, it's voltage is 13.5V .
No load voltage is around 18v, and drifts around. I would stay this transformer is very "stiff".
If the float-voltage for a 12v lead acid battery is 13.6v, it would seem I could permanently leave
the transformer/rectifier hooked-up to keep the battery bank float charged without boiling the electrolyte.
Yes/no?
Second concern, which I believe is negligible, but maybe someone could advise, is if I were use a large
load for an extended period of time, in excess of the maximum charging current, so that the battery
was discharged to a condition of 10.5v, would the resulting bulk charge-rate exceed or overload the transformer?
This would only occur rarely.