I'm working on an automatic load-shedding program to be used with a generator. Basically, I'll be adding a controlling a set of contactors between a distribution panel fed through an automatic transfer switch (which is already in place) and the circuits each breaker feeds.
I already have a degree of load-shedding capability. For instance, when there is a call for the submersible water pump to run, I de-energize the coil for the electric DHW heater, refrigerator, freezer, the electric range and outside lights. I re-energize these items in sequence after the pump stops. This is easy to do, since the items I monitor have a fixed current draw.
However, for items that plug into a receptacle or for lighting, there is a variable current draw. I want to monitor each line with an analog current transducer and shed load to the above devices accordingly.
I found lots of transducers for $75-$90, but I was hoping to find a cheaper supply. I need about 20. 0-10V preffered, but 4-20mA is acceptable. 0-30A range. Accuracy isn't important - 5-10% bias is fine
Suggestions?
I already have a degree of load-shedding capability. For instance, when there is a call for the submersible water pump to run, I de-energize the coil for the electric DHW heater, refrigerator, freezer, the electric range and outside lights. I re-energize these items in sequence after the pump stops. This is easy to do, since the items I monitor have a fixed current draw.
However, for items that plug into a receptacle or for lighting, there is a variable current draw. I want to monitor each line with an analog current transducer and shed load to the above devices accordingly.
I found lots of transducers for $75-$90, but I was hoping to find a cheaper supply. I need about 20. 0-10V preffered, but 4-20mA is acceptable. 0-30A range. Accuracy isn't important - 5-10% bias is fine
Suggestions?
