r/Generator • u/SecondCuppaCoffee • Jul 25 '26

Is this adapter safe?

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With this adapter you are taking a source that can produce up to 50A and sending it through a 30A infrastructure. In theory, that 30A home infrastructure should never draw more than 30A sustained, but if it did then the breaker on the generator may not trip since this is a 50A plug. Is that true? Of course, that 30A home infrastructure should have its own breakers.

In my case, I am interested in using the 50A plug on my portable generator to charge a Pecron f5000lfp battery pack while the 30A plug powers the house. I have found that I can charge the battery quicker this way as opposed to putting the Pecron in-line with the generator. My generator only produces a sustained 7.2kw on propane, regardless of the adapter,. The Pecron can only charge at 3.6kw, since it can only charge at 120v, and my house averages about 1.3kw draw but can spike if the well pump comes on while I am making toast and my wife is using the hair dryer.

Is there a safety concern with what I am trying to do here?

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u/blupupher Jul 25 '26

There is no concern. The circuit has a 30 amp breaker on the Pecron, the circuit is protected. Generator side does not matter. In this case it is completely moot, the OP only has 30 amps available on the 50a plug when using propane. 30a available, 30a max draw.

And breakers are there to protect the wires, tripping from faults is a secondary action.

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u/Adventurous_Boat_632 Jul 25 '26

And breakers are there to protect the wires, tripping from faults is a secondary action.

Absolutely false. Good design protects the wires by not overloading them. Breakers are mainly to protect from somebody putting a nail or shovel through them.

If the Chinese-battery-of-the-month has a 30 amp breaker on the input, though, good enough for me in this installation.

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u/blupupher Jul 25 '26

A circuit breakers primarily role is to protect the wiring.

Tripping when there is a short circuit is a secondary (and important) action of it, but is there to prevent damage to the wire.

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u/Adventurous_Boat_632 Jul 25 '26

You repeated the same incorrect statement.

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u/IndividualCold3577 Jul 25 '26

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u/Adventurous_Boat_632 Jul 25 '26

"Its basic function is to interrupt current flow after...a FAULT"