[RE-wrenches] Physical of Electrical Interlock

[Ray]

What amp rating do you need?  Midnite Solar makes a small 30 amp manual 
transfer switch, while Reliance (via Northern Tool) makes 60 and 100 amp 
models.  Or are you looking for automatic transfer?  Generac makes a 
bunch of 100 to 200 amp rated transfer switches.  Square D and others 
make some bigger load break rated stuff but it gets big and expensive.

Ray Walters
Remote Solar
303 505-8760

On 8/13/19 12:16 PM, Jon Siegenthaler wrote:
> Hello wrenchers,
> I have a client we're building for who is going to have installed two 
> of the SolarEdge Storedge inverters with two of LG Chem RESU 
> batteries. This electrical system also has a backup generator which 
> then requires there to be an interlock between the inverters and the 
> generator. I was hoping because this was a zero export system (as 
> required or by punishment of paying the utility for your 
> overproduction) that the SolarEdge smart meter would detect and not 
> export to the generator, but as a fail-safe it would be better not to 
> trust a $300 meter against a $10,000 generator and install an interlock.
>
> My question is; has anyone found an interlock that would work with 
> this system? From my understanding the inverters would need to 
> switched off, but then the dedicated panels that the inverters are 
> powering would need to be transferred over to the generator power. The 
> simplest answer I can come up with is a panel with no bussing (mounted 
> on din rail) on one side with 4-2 pole breakers, each is set consists 
> of 2-2 pole breakers with jumpers on the backside so that the inverter 
> has a jumper to the dedicated load panel breaker. On the other side of 
> the panel would be either on a bus or also with jumpers that went to 
> 2-2 pole breakers for the generator in and out and then also the 2-2 
> pole breakers for the dedicated load panels. Then there would be an 
> interlock that slides from left to right to control which system was 
> on, this being either PV or generator.
>
> Thanks ahead of time for any help or product suggestions,
>
> Jon Siegenthaler
>
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