I'm trying to reconfigure my SMA Sunny Island from increased self-consumption mode to increased self-consumption mode with backup. SMA offers the required equipment as a pre-build panel, but they state that customers can use an after-market equivalent. And here comes the issue - what can I use for the grid disconnect switch (single phase)?
I was considering an automatic transfer switch, but I'm almost sure that it won't work. The required switch should automatically disconnect the grid if the grid power fails. The ATS won't do that as it needs power to operate (to disconnect).
Or shortly - I'm looking for a switch that:
Probably a contactor with a built-in indicator relay will do the job, but I don't want to experiment with this. So I'm looking for advice.
I was considering an automatic transfer switch, but I'm almost sure that it won't work. The required switch should automatically disconnect the grid if the grid power fails. The ATS won't do that as it needs power to operate (to disconnect).
Or shortly - I'm looking for a switch that:
- Is rated for 63A/230V AC (at least).
- Will automatically disconnect the load if power is missing.
- Will connect the load if and only if power is applied to the solenoid (Q2).
- Has a built-in relay that indicates the switch position (Q2 NC connection on X5 3 and 4).
Probably a contactor with a built-in indicator relay will do the job, but I don't want to experiment with this. So I'm looking for advice.