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Old 08-18-2016, 06:14 PM   #11
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Originally Posted by wmtire View Post
They will be all powered via the adapter but you are going to be limited to what you can use at the same time.

Simply put, when using a 120/240 volt 50 amp split phase service, your RV has TWO 50 amp legs powering it, each at 50 amps for a grand total of 100 amps of potential power.

A 30 amp single phase service has ONE leg at 30 amps for a grand total of 30 amps of potential power.

So, when you have to use an adapter and plug into the 30 amp service, you are actually moving from 100 amps of potential power, to 30 amps....and cannot use everything at the same time as you could when plugged into a 50 amp outlet. You need to remember that your power potential has dropped by over two/thirds when using a 30 amp outlet.

This link explains the differences and the last paragraph explains the adapter you are using:


Electrical Tutorial - Chapter 3 - 30 Amp versus 50 Amp
How is 100 amps possible with a 50 amp breaker? If you tried to se 100 amps wouldn't the breaker trip?
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Old 08-18-2016, 06:35 PM   #12
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How is 100 amps possible with a 50 amp breaker? If you tried to se 100 amps wouldn't the breaker trip?
A 120/240 volt split phase service is really simple once you understand it, but it can take a bit to get your head wrapped around it. The biggest confusion is people thinking that 120/240 split phase works like 120 volt single phase.....which it doesn't.

The main thing to understand is that a 50 amp service is 50 amps at 240 volts or 100 amps at 120 volts. Both produce 12000 watts. Watts= amps X volts

A double pole 50 amp circuit breaker grabs 50 amps from one pole/leg (L1) at 120 volts and another 50 amps from another pole/leg (L2) at 120 volts.

To get 240 volts, you have to have an item connected to both L1 and L2.

The RV doesn't have items connected to both L1 and L2...but instead uses the L1 and L2 separately, so L1 provides 50 amps at 120 volts and L2 provides another 50 amps at 120 volts....... for a total of 100 amps at 120 volts.

Now the L1 and L2 share a common neutral wire (you have to have a neutral when using 120 volts), which is also only rated to carry 50 amps. However, the way the split phase service works is called load balancing as power shuttles back and forth between L1 and L2. The neutral only carries the imbalance.

If you are using 45 amps on L1 and 40 amps on L2...then the imbalance is 5 amps, and this is what the neutral wire carries.

At the extreme, say you are using the max on L1 of 50 amps (as per its circuit breaker max). Then say you are using 0 amps on L2. Then the neutral carries the imbalance of 50 amps (which it is rated for). If something were to happen on either L1 or the L2 and the amps were exceeded on either, then since a double pole breaker is in essence two breakers tied together, if one side trips, then the other side has to trip too. This also protects the shared neutral wire so neither L1 or L2 can make it carry any possible imbalance of over 50 amps.

It's explained a lot better in this link. it takes a little to wrap your head around it, but you will.

Electrical Tutorial - Chapter 3 - 30 Amp versus 50 Amp

More reading;

http://www.rv-motorhome-answers.com/AC-Electricity.html

http://www.myrv.us/electric/

http://www.nojolt.com/Understanding_...circuits.shtml
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Old 08-18-2016, 06:59 PM   #13
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Kenny, what is a "hybrid inverter"? What Make & model did you put in?

Magnum msh3012m

It's a 3k watt inverter than can use battery power to support the shore power. I split most of the rig ac circuits into the sub panel.
I tell the inverter to use 14 amps from the shore power. Any more draw, and the inverter will pull from the batteries.

I also run both fridges on electric while on the road.

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I did some testing the other day.
Ran the front ac right off the batteries. Click image for larger version

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After an hour, the batteries were still at 85% SOC.


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Old 08-18-2016, 08:00 PM   #14
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I think 50 amp service should be called 100 amp service. That is what it is and it would eliminate much of the confusion. Ya, it's split between 2 legs but it is still 100 amps for the rig.
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Old 08-18-2016, 08:29 PM   #15
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I think 50 amp service should be called 100 amp service. That is what it is and it would eliminate much of the confusion. Ya, it's split between 2 legs but it is still 100 amps for the rig.
I disagree. It is NOT a 100 amp service. Any draw of more than 50 amps per phase, will trip the breaker. A more appropriate name might be 'Dual 50 Amp' but not 100 amp.
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Old 08-18-2016, 09:46 PM   #16
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I disagree....
Here, someone always will.
Let's try this,...the sky is blue.
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Old 08-18-2016, 10:14 PM   #17
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If North America abandoned 120 v and went 240 volt for RV's the anacondas we have to carry would have the size. Just 100 amps at 240 volt or 30 amp 120.
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Old 08-19-2016, 07:25 AM   #18
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Here, someone always will.
Let's try this,...the sky is blue.
Nope... not today. Cloudy & grey.
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Old 08-19-2016, 07:30 AM   #19
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I disagree. It is NOT a 100 amp service. Any draw of more than 50 amps per phase, will trip the breaker. A more appropriate name might be 'Dual 50 Amp' but not 100 amp.
X2

A 100 amp 120/240 volt residential service provides 100 amps of 120 volt power on each of two hot legs with the neutral wire capable of carrying an unbalanced load of 100 amps.

A 50 amp 120/240 volt RV service provides 50 amps of 120 volt power on each of two hot legs with the neutral wire capable of carrying an unbalanced load of 50 amps.

A 30 amp 120 volt RV service provides 30 amps of 120 volts power on one hot leg with the neutral wire capable of carrying the entire load of 30 amps.

A 20 amp 120 volt RV service, used on older popups and ?, provides 20 amps of power on one hot leg with the neutral wire capable of carrying the entire 20 amp load.

It takes two hot wires with a shared neutral in order to have an unbalanced load.

It is my understanding that most RV's do not use any 240 volt appliances, although there is no reason they couldn't. An instant hot water heater would draw half the amps if wired straight 220. Unfortunately the instant hot water heater would be useless without a 50 amp 120/240 volt shore power or generator, which is probably the reasoning for wiring everything 120 volts.
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Old 08-20-2016, 09:09 AM   #20
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I disagree. It is NOT a 100 amp service. Any draw of more than 50 amps per phase, will trip the breaker. A more appropriate name might be 'Dual 50 Amp' but not 100 amp.


You are correct, more than 50 amps on either leg and the double breaker will trip. You can however pull 50 amps on each leg, which is the 100 amps.




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