Hello all. Im trading in my 30 amp rig for a bigger rig with dual ac units and 50 amp.I used to run an extension cord from the garage and with the use of an adaptor,plug in for the frige and keep battery charged.My new unit does not use propane for the frige but runs off battery instead.I would like to run the extension cord like I used to to keep the battery charged.Is it ok to run 110 to the 50 amp power cord?

Yes, so long as you are only charging batteries and maybe one AC unit depending on the cord and the outlet (20 amp) that you are plugging into.If your fridge is using AC power from an inverter, it MAY/PROBABLY/USUALLY has an automatic function that switches from inverter usage to run directly from the AC shore power, it that is the case, you likely will not be able to run the air conditioners with the reefer running also from the 20 amp circuit.

WanderingaimlesslyI'm glad you edited your reply. Had family-of-five used that extension cord and 20amp adapter set-up to run a converter/charger, inverter, fridge and AC....something would give (burn up). Usually the AC first.Family-of-five should have a 30A or 50A outlet/breaker install closer to the RV.I did my 30A for under $200.

For what the OP is asking, it would be okay using at least a 12 ga cord that is not super long. I agree with jdc1, and would add, all items mentioned including AC, would be a hefty load, even for a 30A dedicated circuit, but do able, if not a really long run.Jerry

I would use your 50A cord run to the outlet and a dogbone to connect to the receptacle. Then switch off all the circuit breakers to ACs and any other electricity hogs just so nothing gets turned on accidentally.Best scenario is to install a 50A receptacle.

Continue to use the system that served your 30 amp RV.If there is an Energy Management System, I'd set it to 15 amps to limit breaker tripping at the shore power breaker box.Do use a #12 or #10 extension cord, if greater length is needed.

moving up to 50 amp from 30 | Good Sam Community

13 Replies

MFL
Nomad II
Jul 12, 2020
For what the OP is asking, it would be okay using at least a 12 ga cord that is not super long. I agree with jdc1, and would add, all items mentioned including AC, would be a hefty load, even for a 30A dedicated circuit, but do able, if not a really long run.

Jerry
jdc1
Explorer II
Jul 12, 2020
Wanderingaimlessly
I'm glad you edited your reply. Had family-of-five used that extension cord and 20amp adapter set-up to run a converter/charger, inverter, fridge and AC....something would give (burn up). Usually the AC first.
Family-of-five should have a 30A or 50A outlet/breaker install closer to the RV.I did my 30A for under $200.
wanderingaimles
Explorer
Jul 12, 2020
Yes, so long as you are only charging batteries and maybe one AC unit depending on the cord and the outlet (20 amp) that you are plugging into.
If your fridge is using AC power from an inverter, it MAY/PROBABLY/USUALLY has an automatic function that switches from inverter usage to run directly from the AC shore power, it that is the case, you likely will not be able to run the air conditioners with the reefer running also from the 20 amp circuit.

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moving up to 50 amp from 30

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