cost per kWh [RE-wrenches]

[Bill Brooks]

Joel,

With all do respect to Ethan's excellent meters, yours is not accurately
measuring the power consumption to maintain float charge. Although it does
not take much power to float some batteries, the power to keep the inverter
running and maintaining voltage is 40-50 Watts at night. During the day any
current needed for float comes from the array.

Bill.


-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net]
Sent: Monday, June 02, 2003 7:39 PM
To: RE-wrenches at topica.com
Subject: Re: cost per kWh [RE-wrenches]


I am monitoring my SW4048 system with a Brand meter. Float charge input from
the
grid has been averaging around 250 watt-hours per month (much less than I
thought). My 4 each 12-volt 86 AH Johnson Controls sealed batteries just sit
there
waiting for power outages and there have been no outages for the past year.

"Todd Cory, Mt. Shasta Energy Services" wrote:

> Thanks Bill. I would have thought the SW would be far worse in conversion
> efficiency, so it is that stupid battery floating all night that really is
the
> problem. I imagine Outback will be the ones to finally make a grid tie
machine
> that is smart enough to know when it is not needed. 45 to 50 watts
continual
> overhead is significant, especially during those dark winter months when
the
> PV's don't even generate that much.
>
> Todd
>
> Bill Brooks wrote:
>
> > Todd,
> > Night-time losses for the SW are measured at a continuous 40-45 Watts.
The
> > SB is one big donut (no losses) at night.
>
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