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Old 09-21-2015, 08:57 AM   #1
Join Date: Aug 2013
Location: S. FL
Posts: 90
RV math for Nubies (50 - 30 = 70)

A little humor for a change?

Topic, the difference between 30 Amp RV service and 50 Amp RV service.
It is NOT 20 A, It is 70 A

30 A RV service is 120 V, 3 wires Hot Common and Ground.
You have ONE 30 A circuit breaker.
Maximum current is 30 A @ 120 V = 3,600 W (3.6 KW)

50 A RV service is 120/240 V, 4 wire Hot1, Hot2, Common and Ground
You have TWO 50 A circuit breakers.
Maximum current draw on EACH Hot is 50 A
50 A @ 120 V = 6,000 on each leg. times 2 legs = 12,000 W (12 KW)

Summary: A 30 A RV circuit has a maximum load ability of 30 A
a 50 A RV circuit has a maximum load ability of 100 A
The difference between RV service at 30 A and 50 A is 70 A

As a side topic, it has been my understanding that no RV manufactures are installing 240 V loads. Though reading on this site some owners have installed 240 V items?

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Old 09-21-2015, 09:24 AM   #2
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Several brands of high end coaches have 240v dryers and/or cook tops.

Originally Posted by ronnie_g View Post

As a side topic, it has been my understanding that no RV manufactures are installing 240 V loads. Though reading on this site some owners have installed 240 V items?
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