Howdy folks, got a bit of an arb question here.

So a business got 10 of these Sonoff POW3s and want to get them all installed where applicable. It is a factory with solar and a generator, so my only thoughts were to use them in tandem with contactors to:

• Automatically turning factory lights on in the morning and off at night
• Timing geysers to reduce load in the morning when solar is weakest
• Starting the Generator remotely
• Phase monitoring

I would call upon the collective creativity of this community to offer any other uses for something like this in a distribution business?

4 hours ago, Psy said:

Howdy folks, got a bit of an arb question here.

So a business got 10 of these Sonoff POW3s and want to get them all installed where applicable. It is a factory with solar and a generator, so my only thoughts were to use them in tandem with contactors to:

• Automatically turning factory lights on in the morning and off at night
• Timing geysers to reduce load in the morning when solar is weakest
• Starting the Generator remotely
• Phase monitoring

I would call upon the collective creativity of this community to offer any other uses for something like this in a distribution business?

I think youve covered the important bases here. Question, why is phase monitoring important,? 

For lighting and geyser (eg 3kw) you dont really need contactors. 3kw i switch with small 30A relay. 

Edited November 22, 20223 yr by BritishRacingGreen

14 hours ago, BritishRacingGreen said:

I think youve covered the important bases here. Question, why is phase monitoring important,? 

So it looks like the site was only allocated 80A breakers on the incoming line, so they spec'ed the DB and wired the rest of the building accordingly. Their site tech wanted to use 3 of these to monitor the phases, set off alarms if it starts heading into the 75A range and use these to dynamically balance loads. I assume it's only a thing now because they have Aircons running for the heat and when they are all running along with other loads the incoming breaker trips...

 

15 hours ago, BritishRacingGreen said:

For lighting and geyser (eg 3kw) you dont really need contactors. 3kw i switch with small 30A relay.

This was my thinking as well, however they already have a bunch of contactors on site that can be used. The only reason I'm not using relays is because they already have these so it reduces the costs. A couple small 25-40A breakers should work fine and shouldn't cause any issues as far as I know, but if it'll be an issue I would really appreciate any feedback.