net metered system question [RE-wrenches]

jay peltz jay at asis.com
Thu Mar 8 06:55:34 PST 2001


Hi William,

I installed a SW with battery back up that uses a external manual transfer
switch, its just how it worked easiest with this installation.  So when the power
goes out, he flips the switch and the SW is now on line and isolated from the
grid ( so when it comes back on it won't fry the SW).

In regards to search mode, the inverter is still ON as it is selling back, so
that makes no difference.  And at night it'll be on  while battery charging (
unless you disconnect it manually as well in which case it would be in search
mode.)

Good luck,

jay
Peltz Power

William Miller wrote:

> Pals:
>
> Great discussion, thanks.  Here are a few more questions, if I may (I'll
> put them in caps to distinguish):
>
> >
> >Actually most grid intertied systems (without TOU meters) do NOT cycle the
> >batteries. The wasteful (700 watt hours/day) one hell of a huge phantom load
> >is
> >from the SW running all the time... continuously floating the batteries AND
> >it's constant idle current.
>
> I DON'T RECALL THAT THE SW CAN BE PUT INTO THE SEARCH MODE WHILE IN SELL
> MODE CAN IT?  IF THAT WERE THE CASE, THE IDLE CURRENT MIGHT BE REDUCED.
>
> >
> >Normally the output of a grid intertied SW goes to house loads... having a
> >transfer switch on the output would negate the reason for having a battery
> >based system which provides for grid outage backups. The SW's internal
> >"transfer switch" shifts SW output loads to the grid when it is active and
> >backs up these same loads up from the batteries/inverter during grid
> >outages.
> >
>
> IN OUR AREA, OUTAGES ARE RATHER INFREQUENT.  THEREFORE, A BATTERY BACKUP
> INVERTER SYSTEM IS USED FOR BACKUP MAYBE 10 HOURS PER YEAR.  THE ABOVE IDEA
> IS ONLY FOR HOME OWNERS THAT MIGHT BE WILLING TO MANUALLY ENGAGE THAT
> BACKUP CAPABILITY ON THE RARE OCCASION IT IS NEEDED.
>
> WILLIAM
>
> __________________________________________________________________
> William Miller
> SLO Communications: Communications and Power Systems Consulting
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 michael.welch at homepower.com

____________________________________________________________
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