I have two of these in service now for about 5 years.
This failure was my bad, I tried switching from inverter to 120v and back with a D. P. D. T. relay.
I did not take into account that the compressor would be out of phase with the inverter some times.
POOF!! Now I have a 5 min time delay for switching back and forth from 120 to inverter, all is well.
I rewired the Fet drivers so as not to have to work with the Surface mounted fleas and crap.
When the Fet's shorted they also burned off some of the runs to the cheep SMCs.
so far its been on line now for two days at 400 watts.
Seems to be working ok its 100 degs. and the fans are only running about 30 percent of the time.
Will shoot for 1000w later during Air Conditioning season. Fingers Xed.
The most I ever run is 1200w in the winter when its cooler, due to the false Bloated advertising.
Major Modifications:
N3, N4, N5, N10, N8, N7, N21, N20 and associated circuit placed on 4 small Driver Boards Attached to the MOS Fet Heatsinks.
4 extra Fets added. Replaced all with IRFB7437pbf Fets. On resistance .0015 ohm. Originals were MXP400BTS .003 ohm.
Disabled all the Surface Mounted Flee and Tick circuitry by cutting runs on the board. Added Terminal Strip.
Hard wired drivers to terminal strip after installing them back on the board.
Note: Disclaimer, this is a hobby. Nothing is really worth fixing any more.
The inverter is only $140 It cost $40 for parts and 20 Hours Labor. At ($50/Hr) Cheep $1000 :-(
This failure was my bad, I tried switching from inverter to 120v and back with a D. P. D. T. relay.
I did not take into account that the compressor would be out of phase with the inverter some times.
POOF!! Now I have a 5 min time delay for switching back and forth from 120 to inverter, all is well.
I rewired the Fet drivers so as not to have to work with the Surface mounted fleas and crap.
When the Fet's shorted they also burned off some of the runs to the cheep SMCs.
so far its been on line now for two days at 400 watts.
Seems to be working ok its 100 degs. and the fans are only running about 30 percent of the time.
Will shoot for 1000w later during Air Conditioning season. Fingers Xed.
The most I ever run is 1200w in the winter when its cooler, due to the false Bloated advertising.
Major Modifications:
N3, N4, N5, N10, N8, N7, N21, N20 and associated circuit placed on 4 small Driver Boards Attached to the MOS Fet Heatsinks.
4 extra Fets added. Replaced all with IRFB7437pbf Fets. On resistance .0015 ohm. Originals were MXP400BTS .003 ohm.
Disabled all the Surface Mounted Flee and Tick circuitry by cutting runs on the board. Added Terminal Strip.
Hard wired drivers to terminal strip after installing them back on the board.
Note: Disclaimer, this is a hobby. Nothing is really worth fixing any more.
The inverter is only $140 It cost $40 for parts and 20 Hours Labor. At ($50/Hr) Cheep $1000 :-(
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