[RE-wrenches] Low grid voltage fix

[August Goers]

Hi Joel -

Have you tried getting PG&E out to check the line voltages? I believe they
need to be +/- 5% steady state (ANSI Range A) or possibly +/- 10% (Range
B) or they need to fix it. 105 V is way too low.

Here in the Bay Area I have found that PG&E is very receptive to resolving
line voltage issues. They normally have a tech out to the site within a
few hours after making a service call...

Best,

August

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Joel
Davidson
Sent: Sunday, December 19, 2010 9:25 AM
To: RE-wrenches
Subject: [RE-wrenches] Low grid voltage fix

Wrenches,

It's Christmas time again in Southern California Edison (SCE) territory
which means low insolation and high regional electric consumption. Every
night SCE voltage drops to around 105 VAC or lower. Our grid-tie SW4048
inverter sees SCE's low voltage as a brownout and switches to autonomous
mode which is normal. However, we have only 4 kWh of battery storage so
the
combination of nightly brownouts and a series of cloudy days eventually
depletes our battery bank causing the inverter to do a low-voltage shut
down
which is normal. Power goes off in our home and we have to switch over to
SCE power, reset the inverter, and wait until the battery bank is
recharged.
How do we set the SW4048 to accept as low as 100 VAC from the grid before
switching to autonomous mode?

Joel Davidson

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