Todd is correct. This solution is simple and works. You'll still want a
switch or breaker on the input.
Allan
On 12/19/2022 9:13 AM, Todd Cory via RE-wrenches wrote:
If the grid is wired to AC2, then the inverter can charge off off that
source but not sell to it.
Todd
On Mon, Dec 19, 2022 at 8:21 AM David Palumbo via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Wrenches,
I have been retired from doing solar installs for 10 years now
and I am reaching out for help as to recommending a solution
to an old do-it-yourself customers question.
His solar system that was formerly off-grid and is now using
grid power instead of a back up generator.
He had/has no intention of doing a net-metered system. Just
trying to reduce dependance on a fossil fuel genset during our
mostly sunless Vermont winters.
He says that he brought in power a few years ago to run their
expanding maple sugaring operation located next to their
house. At that time they ran a 115Vac circuit (grid power)
over to their house and connected grid power into AC Hot In
terminal #! in their Trace SW 2512. This is correct as I see
terminal #2 is labeled for generator power.
He has the Trace programmed for float mode not sell mode.
Their local utility was working on the line nearby on the main
road and noticed a small amount of current flowing into the
grid and figured out where it was coming from. The utility did
not immediately shut him down. Just told him to correct the
problem. He is asking me for advice.
My first inclination is to separate the grid power completely
from the inverter power and to feed both power sources into a
double pole double throw transfer switch. What other options
should be considered.
Thanks in advance and happy holidays,
Dave Palumbo
Formerly > Independent Power & Light
Hyde Park, VT
802-371-8678 voice or text
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