system monitor for net metered systems [RE-wrenches]

Todd Cory, Bald Mtn. Solar toddcory at jps.net
Sat Jun 23 21:22:26 PDT 2001


Hi Doug,

Two questions...
One how much did Ethan's package cost?
Two, is that a realistic example for the (in)efficiency of the SW-4024?
I know they are BAD... but curious how bad.

Thanks,

Todd

Doug Pratt wrote:

>   I've put a package together with Ethan Brand using one of his fancy
> digital meters. It monitors DC power into the battery, plus both AC
> outputs. The AC circuits are summed together. So if there's 2500 watts
> going out the AC output terminals, but 2000 watts coming into the AC1
> terminals, the net display is 500 watts output. You can then compare
> this AC value to what's coming in on the DC side. In the example above
> if the DC input is reading 750 watts, then your batteries (and
> inverter inefficiency) are eating 250 watts.

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