Frankman60
Member
The label on my AC compressor says 208-230 volts. I’m not sure how many volts it actually takes to spin the rotor but I know that when I tried it without the Sure Start I heard the relay clicking but that was all. At the time of the test, the house load was about 2 kWs.
Even if the compressor is 208 volts, or 28 kWs, isn’t that too much for 2 PWs that have a surge rating of 14 kWs (7 kWs each)? If the Sure Start device reduces the amps by half, that would still be 14 kWs which would be at the maximum surge capacity of 2 PWs, assuming not other house load being backed up.
Even if the compressor is 208 volts, or 28 kWs, isn’t that too much for 2 PWs that have a surge rating of 14 kWs (7 kWs each)? If the Sure Start device reduces the amps by half, that would still be 14 kWs which would be at the maximum surge capacity of 2 PWs, assuming not other house load being backed up.
Double-check if it's 240 volts. My labeling says HVACs motors run at 208 volts on 240V circuits. So the 135A LRA @ 208V is 28.08 kW, and the PWs should only see it as a load of 117A. Split to two PWs, that's 58.5A each.
58.5A is of course too close to 60A limit (for 2 PWs), but then the SureStart should have lowered the LRA enough without causing any other electrical damage. 58.5A / 2 (for 2 PW) / 2 (50%) = 14.625A per PW with the SureStart.
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