wiffleballpractice
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- Pretend Electrical Engineer
A heat pump system combined between the AC and air handler might be over 50A of MCA if it includes a beefy resistive heating element for aux/emergency. One of my systems combines to something like 64A, but 40A of that is the resistive heat kit.I doubt you have a 50A AC. The compressor unit will have 2 ratings, “minimum circuit ampacity” (MCA), and “maximum overcurrent protection” (MOCP). MOCP is the largest breaker rating allowed and probably where you’re getting 50A. You need to look at the MCA.
If it’s less than 35A, it will probably work, but you might need a special “soft start” module to limit the inrush current. Most HVAC technicians are familiar with this because the same limitations apply to marginally-sized standby generators.
I bring that up because in researching all of these solutions, I've found that modern homes with mostly all electric appliances can really be in a bind because any significant electric appliance (water heater, dryer, small central AC, oven) can draw almost 7.2kW by itself. ~9kW will reliably run most any major appliance, but you can only seemingly do that with the IBP. (I realize I'm mostly just repeating content from Tom).
Great video, by the way; I appreciate the detailed breakdown!
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