Joel,
Unrelated, mostly. I got a call from a customer a few weeks ago
that was claiming his inverter had failed working. When I arrived it was in
fact not working and gave a code that the grid voltage was too high. I
called Fronius and they said they sometimes have had to replace a card to
fix this sometimes, but also suggested that I check the grid voltage first,
just in case.
I was a bit surprised to find 270 VAC L-L, 135VAC L-Gnd. Out of
disbelief, I checked it with another meter and got the same readings. This
was PG&E, NE Ca. Service dude came at customer's request and claimed the
"voltage reg" was not adjusted properly. Problem fixed.
Bill
Feather River Solar Electric
4291 Nelson St.
Taylorsville, CA 95983
530-284-7849/6544 fax
----- Original Message -----
From: "Joel Davidson" <[email protected]>
To: "RE-wrenches" <[email protected]>
Sent: Sunday, December 19, 2010 9:24 AM
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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