I’m in the process of building a solar shed in the backyard of two cabins. See picture. I have 4 -48v lithium batteries, 4000w of solar panels and a LV6548 6500w inverter all-in-one. In the past both cabins have had their own solar systems, so now we will have one big shed with the solar. Both cabin have sub panels that have 15a breakers in it. My question is what type of electrical panel should I have in the shed this electrical panel would feed both sub panels. I’m think of getting a 60a breaker that will feed two 30 breakers. Each 30a breaker would feed each sub panel in each cabin. Or does anyone have a better suggestion?
Electrical panel to 2 sub panels - 120v off grid
- Thread starter Derka181
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It depends a lot on the wire size you intend to run to the cabins. If UF 10awg under 100ft the 30 amp feeder breaker would be fine. The panel you should have in the power building is a Main type panel that allows you to bond neutral and attach ground rods to. You might need ground rods at the cabins sub panels if the distance from the power shed is a certain amount (I can't recall off hand what that is).
Hedges
I See Electromagnetic Fields!
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Depending on distance, maybe one 60A run (6 awg?) from shed to one cabin, daisy chain to second cabin.
Each cabin could have a 30A backfed breaker (one might trip its 30A "main" breaker without affecting the other), or each could have 60A breaker. How many 15A breakers in each cabin? One or the other could use up to all available current this way.
Except, even with 30A breaker, not likely inverter can trip it. Magnetic fast trip (15 milliseconds) requires 5x rated current, 150A or more, which may exceed inverter's surge capability. Below that, takes longer to heat up, likely exceeds 6500W longer than inverter can supply. So larger breakers are just a shut-off, not OCP.
Each cabin could have a 30A backfed breaker (one might trip its 30A "main" breaker without affecting the other), or each could have 60A breaker. How many 15A breakers in each cabin? One or the other could use up to all available current this way.
Except, even with 30A breaker, not likely inverter can trip it. Magnetic fast trip (15 milliseconds) requires 5x rated current, 150A or more, which may exceed inverter's surge capability. Below that, takes longer to heat up, likely exceeds 6500W longer than inverter can supply. So larger breakers are just a shut-off, not OCP.
Oh good point
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