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Posted by dave on May 12, 2007, 4:36 am
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On Sat, 21 Apr 2007 18:55:01 -0400, Neon John wrote:
>
>Yes, that's fine. Unsurprising that the breaker would buzz under
>load, as the inverter draws more power at the peak of each half cycle.
>
>I've tested domestic type AC circuit breakers rather extensively for
>use on DC relative to my electric car work. This type of breaker
>interrupts what golf cart batteries can throw at it up to about 48
>volts. Above 48 volts to 72 (the highest I've tested), the
>interruption is accompanied with some rather violent arcing that comes
>out the arc chute. The breaker still functions just fine but I'd
>replace it after a short circuit interruption. It's perfectly fine
>for your 12 volt system.
>
Thanks for all the info. I found a DC automotive-type fuse and
installed it at the positive terminal of the series connection between
the two batteries.
I decided to keep the AC circuit breaker in addition to the fuse as a
convenient way to disconnect the batteries. I'll see how it does for
awhile, at least.
I also got a separate inverter to use instead of the UPS, since the
UPS won't operate unless it was plugged in when the power went out.
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