Hi all,
I am spec'ing out what I would like to do with an RPC, and I'm hoping for some general guidance here regarding the start up amperage from a duplex compressor with 7.5HP 3-phase motors and how well my residential service will support it.
My shop is at my residence, where I have a big green humming box from the power co (a pad mounted transformer). This transformer feeds only my house, and it consists of two-200AMP services (one is general house, one is house HVAC system). My shop is fed from a 100AMP sub-panel from the house feed.
Does having my own transformer (which must be at least 400AMPS) suggest that I am going to have enough power to my site to not cause problems at the house/neighbors with the in rush from a 7.5HP motor? I know that running both will be stressing my 100AMP service, but I'm more concerned about brownouts, etc. I'm feeling like it should be plenty.
If it isn't sufficient, should I be considering a commercial RPC which has the additional boost/hard starting capacity which lowers the current inrush to load motors via electronic wizardy (note this is not soft-start of the idler, but boost of the load starts)? I would be all for one of these, but in general they are a lot more expensive and they are not expandable. I'd like to start simple and alter as I change me mind, not to mention keep more $ in my pocket.
My current plan is to go with a commercial 10HP soft-start system and add idlers to support what is needed over time.
Thanks for any thoughts,
Don
I am spec'ing out what I would like to do with an RPC, and I'm hoping for some general guidance here regarding the start up amperage from a duplex compressor with 7.5HP 3-phase motors and how well my residential service will support it.
My shop is at my residence, where I have a big green humming box from the power co (a pad mounted transformer). This transformer feeds only my house, and it consists of two-200AMP services (one is general house, one is house HVAC system). My shop is fed from a 100AMP sub-panel from the house feed.
Does having my own transformer (which must be at least 400AMPS) suggest that I am going to have enough power to my site to not cause problems at the house/neighbors with the in rush from a 7.5HP motor? I know that running both will be stressing my 100AMP service, but I'm more concerned about brownouts, etc. I'm feeling like it should be plenty.
If it isn't sufficient, should I be considering a commercial RPC which has the additional boost/hard starting capacity which lowers the current inrush to load motors via electronic wizardy (note this is not soft-start of the idler, but boost of the load starts)? I would be all for one of these, but in general they are a lot more expensive and they are not expandable. I'd like to start simple and alter as I change me mind, not to mention keep more $ in my pocket.
My current plan is to go with a commercial 10HP soft-start system and add idlers to support what is needed over time.
Thanks for any thoughts,
Don