On 1/4/2012 3:01 PM, All Solar, Inc. wrote:
Wrenches,
Once again I am trying to size a grid tie w/battery system and I
struggle a little with the efficiencies of them.
With PV Watts (v.1), is changing the DC to AC derate an accurate
method for getting the output?
Thanks in advance!
Jeremy
If you keep the batteries charged to a voltage just above their resting
voltage,
say, 52 volts for a 48V system, and the battery bank isn't too large,
(~225 A-hours,
maybe a bit more), about 90% PV to grid AC efficiency is in the ball park.
That's what we figured in the early days of GFX inverters at OB. That's
giving
5% for the electronics and 5% for keeping up the batteries.
Different and/or more accurate information may have come along since
that time.
boB
All Solar Inc.
Jeremy and Amy Rodriguez
1463 M St
Penrose, CO 81240
www.asolarelectric.com <http://www.asolarelectric.com>
Phone 719-372-3808
Fax 719-372-3804
Email [email protected] <mailto:[email protected]>
Email [email protected] <mailto:[email protected]>
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