Ask any HVAC tech how many 240V contractors they replaced this week alone
on condenser units. They carry boxES on their trucks around here. Granted,
those are engaged far more frequently than in a PV system application,
enduring many cycles per day. But it's still not a failsafe solution.
In my op
I haven't had problems with contactors failing. I suspect that a lot of
the problems on battery systems happen when contactors are controlled at
battery voltage.
The nominal voltage of the system is not what the coil will see. A 48
VDC coil might experience 63 VDC. A resistor needs to be put in
You are correct on this.
The failure of any control hardware, IO's / relays / contactor logic
along the way from generator sense to PV contactor should result in the
coupled grid-tie PV inverter disconnected. Which means the contactor at the
PV inverter should be energized "closed" (so PV AC conne
I'm not a fan of this strategy because it is not failsafe. Contactors fail.
When the coil fails to open the contactor, you will have the PV AC coupled
with the generator If he normally closed contactor is used in this manner.
I think the question needs to be the converse: How do you turn the PV on
I’ll usually use a 60 amp contactor with 240Vac coil.
The generator powers the coil and opens the Normally Closed contacts
disconnecting the grid tie inverter.
Maverick Brown
Off-Grid Solar Commander since 2006
Maverick Solar Enterprises, Inc.
• Solar Commander Remote Power
• SunFlow System
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