On 14/08/19 21:47, Cor van de Water via EV wrote:
Paul,
Tell me how you switch a solar panel off?
Only way I know is to throw a light blocking cover over the panels.
As you point out, shade is a good way purposely shut off panels.
Inverters have two safety measures that they use to stop production.
I can have too much PV power for my service entrance transformer and, as
my PV production rises, my ac voltage rises. Most of my micro inverters
seem to shut down around 260vac; my no production voltage is 245-248. I
have a 5kw string inverter that I have never observed shutting down due
to high voltage; I presume it's cut off voltage is around 265.
In an off grid situation, a PowerWall or similar can decide to shut down
PV production; that happens when there is insufficient demand. The
PowerWall achieves that shutdown by shifting frequency off of 60hz. I
don't know the amount of the shift but I have observed motor driven
clocks losing or gaining time when PV is shutdown.
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