3000W Chinese Gensets Info.
professor95 wrote: EDIT ADDED 45/5/2013- When this thread started in March of 2005, I never expected to see it survive this long or amass the quantity of information that has been shared here. In...
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I did this mod yesterday. The voltage never dropped below 112 at full load (28 amps) but the breaker will trip if I pull a sustained load above the 28 amps. This is with the RV connected to the normal 120V outlet.
BTW MrWizard, I was thinking the same thing. When I originally tested the Gen with the factory config the breaker did not trip until about the same amperage although the voltage at that point was below 100V. You'd think the breakers would trip at a lower amperage than that, but they never did. If anything, the CB's should be tripping with the rewired config since all the current is flowing through a single CB. Testing shows the CB does not trip until 28 Amps at which point you can hear the gen is under heavy load. I ran it for an hour this way, (pulling about 24.2 amps and 112.8 Volts, basically just over 2700 watts). CB never tripped. In any case, this should not be a safety hazard since the worst that should happen is for the CB to trip below full load. At which point I would consider wiring the CB's in parallel or changing them out for a higher rated one.
To wire the CB's in paralell you would simply have to move one more wire. The blue panel wire would have to be moved to the red gen wire. Then the NEMA outlet would have one CB on the blue wire and one CB on the brown wire, both on the same phase. Then either bridge the wires at the outlet (requires opening the panel) or bridge them at the male plug. I did not like that option since it effectively paralells the CB's and they are not tripping the way my re-wired schematic shows. I would rather have one CB trip at too little current rather than two in paralell at too much. Specially when testing! However, the CB is not tripping prematurely, so there is no need to go to the extra length.
Single CB is safer and if it does not trip at too little current, then my preference is to leave it that way.
The schematic is posted in my profile for those that wish to view it.
BTW MrWizard, I was thinking the same thing. When I originally tested the Gen with the factory config the breaker did not trip until about the same amperage although the voltage at that point was below 100V. You'd think the breakers would trip at a lower amperage than that, but they never did. If anything, the CB's should be tripping with the rewired config since all the current is flowing through a single CB. Testing shows the CB does not trip until 28 Amps at which point you can hear the gen is under heavy load. I ran it for an hour this way, (pulling about 24.2 amps and 112.8 Volts, basically just over 2700 watts). CB never tripped. In any case, this should not be a safety hazard since the worst that should happen is for the CB to trip below full load. At which point I would consider wiring the CB's in parallel or changing them out for a higher rated one.
To wire the CB's in paralell you would simply have to move one more wire. The blue panel wire would have to be moved to the red gen wire. Then the NEMA outlet would have one CB on the blue wire and one CB on the brown wire, both on the same phase. Then either bridge the wires at the outlet (requires opening the panel) or bridge them at the male plug. I did not like that option since it effectively paralells the CB's and they are not tripping the way my re-wired schematic shows. I would rather have one CB trip at too little current rather than two in paralell at too much. Specially when testing! However, the CB is not tripping prematurely, so there is no need to go to the extra length.
Single CB is safer and if it does not trip at too little current, then my preference is to leave it that way.
The schematic is posted in my profile for those that wish to view it.
