On Feb 14, 12:51 pm, wrote:
I was thinking about using a UPS as a power supply for an amplifier.
The UPS is rated at over 2KW and uses 48 volts on the DC bus. I have
tried powering an amp directly from the batteries and it seems to work
OK. Battery pack is rate at 20 amp/hr. The inverter side of the UPS is
dead but the charger side is still functional. The plan is to remove
the inverter circuit completely. Can anyone think of anything wrong
with doing this.

JImmie

Do you plan on leaving the batteries in the unit? They act as a large
filter capacitor for the unit. If you take them out, you will need to
use some rather large filter capacitors to get anything close to DC.
If you have an oscilloscope, look at the waveform with the batteries
in place and with them disconnected. That will tell you how badly you
need filtering.

Good luck,
Paul KD7HB