13,500 BTU vs 15,000 BTU second AC

The Texan wrote:

dougrainer wrote:

The Texan wrote:

dougrainer wrote:

The Texan wrote:
We are running BOTH 13.5 units on 30A with NO problems, so you will have no problem with a 15 unit. Try running your fan on "high" instead of auto, when in high humidity and that should stop the icing.

Really??? If you look at his photo post, his 13.5 Penguin will pull 15.1 amps at 95 degree ambient on hi cool. His 15k original rear unit will pull 16.1 amps on hi cool at 95 degrees. That puts his TOTAL AC load at 31.2 amps with NOTHING else in his RV on. If the temps go to 105 (they are in Texas right now), his amp draw will go UP 2 more amps to a total of 33.2 amps. Doug

Doug, go back and read his post. He said ONE 15k on 30A, NOTHING about running both on 30A. And like I said we are setting here with temps reaching low 90s and have no problems with two 13.5k Dometic on 30A. Yes, we do shut down the rear AC when we run the micro and we do have the water heater on gas, but we have a residential fridge, a 32" TV and all the other normal stuff. We have NOT tripped a ckt breaker once.

NO, YOU read it again. I see nothing in his post about running his RV on 30 amp service. YOU made the statement about your RV on 30 amp service and I was just letting him know, that almost ALL RV's cannot run 2 AC units on 30 amp service especially his. I will bet if I look at your 50 to 30 adapter, it is burnt and corroded (30 amp side) from the excess amp draw caused by what you are doing. Doug

Sorry Doug, but I hold a Journeyman Electrician license and I will guarantee you my dogbone is NOT burnt or corroded. I know what my system is doing at all times and with BOTH 13.5 Dometic AC's running, even when they both have a compressor start at the same time, it does NOT exceed 30A.

Here is his post I referred to, that you say did NOT exist...

TexasRedNeck wrote:
Regarding the 30 vs 50 amp, I will use 50 amp sites until the fall and hope that 30 amp will run the 15K unit in the main living area and be enough without cranking up the second AC. I think the 15k AC pulls about 17A at start up if I recall correctly.

You are correct, but he did not state that in his first post. Curious, when did being a Journeyman Electrician qualify them as HVAC experts???? IF both 13.5k Dometic Compressors start at the same time you will easily EXCEED 30 amps. The start amps on each compressor is about 16 to 18 amps for a few seconds. And, what other 120 appliances do you have running? The ruuning amps of a Dometic 13.5k on HI COOL is about 14 amps at 95 degrees. 13 amps at 85 degrees. Your RV refer pulls 2.6 for a 2 door to 3.5 for a 4 door. The Power Converter pulls 1 to 3 amps depending on DC load. With both AC's running in 95 degree ambient you are pulling 28 amps. On 30 amp circuit, you do NOT have much extra to run anything else on. Doug