8/12/2023 0 Comments 150 amp panel directions![]() This sometimes means getting a higher bus ampacity because that's what's cheapest at 24 spaces, say. So wildly over-sizing the panel (in terms of number of spaces) is always a good idea. But a) panel spaces are cheap, and b)having to replace a panel because you ran out of spaces is a nightmare, and c) a 100A panel can support a lot more stuff than you think, and you'll want to do that later. I understand gravitating toward the smallest panel that will do the job today, that's your "thrifty gene" doing its thing. See what Ed Beal says about getting a larger panel with more spaces. I would get the 150 amp panel with more circuits you can feed it with anything below 150 as long as the wire size matches the feeder wire requirements. Going to a larger feeder breaker 90 or 100 requires a larger wire size but I doubt you will need that much power. Only during really heavy loading of your circuit would #1 aluminum have a voltage drop that was at the max recommended by the NEC and it never exceeds 5% up to 80 amps. If you are drawing 50 amps 240v on the #1 wire the voltage drop would be only 6.6volts (got that by playing with the amperage and % voltage drop). If you actually used 80 amps of 240v then the drop would be 10.6v with 1awg or #1 wire not a problem. In the US the National Electric Code there are suggestions of 3% and 5% for voltage drop but these are only suggestions. Input in 5 in the % and the wire size drops to 1 awg with a 4.44% voltage drop ![]() ![]() At that length aluminum feeder would be much cheaper, selective boxes for feet, single (phase), aluminum, direct burial/conduit/overhead, minimum conductor size, input 275 (for the length), input 240v for the voltage, max voltage drop leave at 3 (but we will play with this), current at end (since you don’t know guess at 80), input 1 for parallel sets. ![]()
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