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hpc2020
2005 Aug 09
0
How to lower float charge voltage of an APC Smart UPS unit
...minutes for all internal voltages to bleed off.
3) Remove the cover from the UPS and remove the plastic sheet which covers
the circuit board.
4) Locate the 100K ohm resistor labelled R118. You have found the right
resistor if one end of it connects to pin 14 of the intergrated circuit
labelled APC2020. This is the sense resistor for the battery float charge
voltage regulator.
5) Solder a 1.3M ohm resistor in parallel with R110, to lower the resistance
by a few percent.
Now the float charge voltage will be a little bit lower so that you can use
Lead Acid batteries.
Note that this modification...
2005 Aug 09
0
How to lower float charge voltage of an APC Smart UPS - corrected
...t five minutes for internal voltages to bleed off.
3) Remove the cover from the UPS and remove the plastic sheet which covers
the circuit board.
4) Locate the 100K ohm resistor labelled R118. You have found the right
resistor if one end of it connects to pin 13 of the intergrated circuit
labelled APC2020. This is the sense resistor for the battery float charge
voltage regulator.
5) Solder a 1.3M ohm resistor in parallel with R118, to lower the resistance
by a few percent. Now the float charge voltage will be a little bit lower so
that you can use Lead Acid batteries.
Note that this modification o...