net metered system question [RE-wrenches]

Allan Sindelar, Positive Energy, Inc. allan at positivenergy.com
Fri Mar 2 17:31:58 PST 2001


Bill,
I see where you're going.  But where do you set bulk then? Normal 58.8-59.2
for battery care, with immediate drop to float? Also, I have been advised by
Trace to set absorption duration off by 10 minutes with inverter pairs, so
they don't fight each other (one inverter's charging causing the other to
ramp back, in a loop logic). I suppose with absorption at 0 it's a moot
issue?
Thanks.
Allan

----- Original Message -----
From: "Bill Brooks" <billbrooks7 at earthlink.net>
IMPORTANT setting point for SW inverters in grid-connected systems. Shut off
> the bulk charge absorption time (set to 0:00) so that it will not bulk
> charge every time you have an outage. If the grid is doing funny things in
> your area, a 2:00 hour set time can keep the unit off all day long. Just
set
> the unit to float the battery at 54 volts (temperature compensated) all
the
> time. Make sure the PWM controller is set well above 54 (say 55.5V) and
> temperature compensated to keep it from stealing power from the PV array.


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