Grid tie

G'Day,
Just thinking about the solar systems inverters and the grid tie.
Why is the grid tie onto the consumer side of the main switch and not
onto the grid ?? ( Meaning no solar power without mains )
That way the consumer would have some power during an outage during
daytime. The tie would still be controlled by the mains presence.
Cheers ....... Rheilly
Reply to
Rheilly Phoull
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The solar array is customer owned equipment so it needs to be on the load side of the disconnect. It also gets protection from the main breaker in case of a fault. The line side can be thought of as pretty much unprotected.
If the power is out, it is out on the line side too so the inverter will shut down either way. They actually "clock" from the line voltage. No line voltage, no clock, no output.
There are some companies that are coming out with an inverter that will work in an outage but I haven't seen one yet myself..
Reply to
gfretwell
So the inverter freq. is triggered by the mains freq. so it's always in sync ? ( I had overlooked that issue )
Reply to
Rheilly Phoull
Probably the main breaker is automatically opened if there is an outage on the mains. The utility doesn't want feedback from the solar system as a safety precaution. Dangerous voltages could be present on the HV side of the transformer- on supposedly dead lines.
Reply to
Don Kelly

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