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Posted by David Kelly on July 20, 2008, 9:19 pm
Whelan - '02 200exc (x2) & '04 MTD 38 wrote:
> If I wire two 100-amp circuit breakers in parallel in a DC circuit,
> will that yield the equivalent of one 200 amp breaker?
>
> Shockingly enough, when powering my 2kw inverter, I'm tripping the one
> 100A breaker from the 12v battery bank.
12 volts times 100 amps = 1200 watts. Surprise!
No, wiring two 100A breakers in parallel probably will not result in a
200A breaker because the load probably would not evenly split.
We see this sort of thing trying to parallel diodes for higher current
capacity. It can work when multiple diodes are made with close
tolerances and put in one package so they all stay close to the same
temperature. When using separate diode packages in parallel we add a bit
of series resistance to each so that if one starts conducting more than
the others the resistor holds back and prevents all the current from
flowing through that one diode.
Breakers are like resistors, but I wouldn't bet on using breakers in
parallel.
Fix your core problem in that you don't really have a 2kw inverter.
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