Grid offseting system for 10-12 homes, Colorado [RE-wrenches]

[Kurt Nelson]

Hey Kurt,

I have used a simple voltage controlled relay (simple switch), but the
link allows you to pull in a relay based on battery state of charge.
You can program the Link to have a load/circuit transfer to the inverter
at 95% sco and then back to the utility at say 90%.  As long as the
(freezer) doesn't pull 5% of battery capacity during each run-cycle of
the freezer, and it gets replenished during the off-cycle, it stays on
the solar.  

I have had owners of such systems tweak the settings and keep the
freezer on all night, but the deeper the discharge, the less efficient.
I usually have to work at getting the owners to understand that we
aren't doing an off-grid system, just getting the most out of the PV
during periods of sunlight.  This also leaves the batts nearly full to
back up some loads during outages. 

Kurt Nelson

-----Original Message-----
From: Kurt Albershardt [mailto:info at es-ee.com] 
Sent: Thursday, March 18, 2004 4:46 PM
To: RE-wrenches at topica.com
Subject: RE: Grid offseting system for 10-12 homes, Colorado
[RE-wrenches]

--On Thursday, March 18, 2004 4:30 PM -0600 Kurt Nelson
<sunwise at cheqnet.net> wrote:
>
> The above mentioned system has five outlets on the wall next to the
main
> load center in the basement.  One is always solar, one is always
> utility, one transfers on and off the solar/utility based on
> state-of-charge and backs up to the solar regardless of SOC during an
> outage, one transfers on and off but does not back up in a power
outage
> (dehumidifier plugs in here) and another double outlet is always on
the
> utility unless there is a power outage.  The hard-wired deep-well pump
> is also always on the utility unless there is an outage.

Relays and diodes off an aux terminal on the Link?

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