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Old Jul 17, 2012, 08:01 PM
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United States, CT, East Hartford
Joined May 2010
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Dell Poweredge 6650 PSU (ASTN 7000245) OVP disable modification to 16.5V

Dell Poweredge 6650 (ASTN 7000245) PSU voltage control OVP mod to 16.5V.

Stock OVP(over voltage protection) for the 6650 PSU is around 13.3V.

This simple mod will raise the OVP to 16.5V.

Remove the 5 screws as indicated to remove the back panel.

Locate the leftmost connector on the daughterboard.

Add a 1k resistor in series with the Grey wire.

Voltage will now be adjustable from 3.3V-16.5V(OVP).

There is no UVP on this unit so voltage can be adjusted down to 3.3V at the full 72 amps of current.

I suggest staying below 15.6V as the output capacitors are rated at 16V.

Tested at 15.5v and 72A.

A higher value resistor can raise OVP to above 20V.

The output caps will need to be replaced if voltage goes above 16V !!

Two of these PSUs(at 15.5V) in series(31V) should max out any charger available and will max out most 120V outlets at full power !!

Do this mod at your own risk !!
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Last edited by xandrios; Oct 11, 2012 at 11:24 AM.
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