Much of a difference between 13,500 or 15,000 BTU A/C?

[Buzzcut]

I’m getting ready to add a second A/C to our t/t that came equipped with a 15,000 Dometic unit. It worked fine but it did get a little warm last summer when we went away for two weeks. Looking to either go with the 13,500btu or 15,000btu Dometic Brisk Air 2. I’m putting it in the bedroom and it will have its own dedicated line. Cost isn’t a factor but I was just wondering if there really is a noticeable difference in cooling. TYIA.

[hypoxia]

My vote is for the 15K and while you're at it go with a heat pump.

I've never had a camper that I wished had a smaller A/C unit. When your heater quits some cold winter day you will be very happy with the heat pump.

[wa8yxm]

ford truck guy wrote:
My thinking would be to go with the 15k... When 2 are not needed, you could alternate which one is used to possibly prolong the life...

If cost is not an issue, thats my choice

Electrically you might be surprised. My RV came with two 13.5K units that drew 13.5 amps running (Carrier's) The Advent air in the bedroom is not 15K but 13.5 amps

The coleman over my head as I type is 15K but 13.9.. Not that big a difference in amps.. but more cool.. still not enough in full sun but it does cool faster in the evenign and makes sleeping more comfortable.

OH. one other things.. Colemans SUCK (now for an A/C this is a good thing) meaning they pull air in over the condensers and exhaust it out the side.. Most everybody else BLOWS.. What is it good that coleman's suck. Well they are way way way way way easier to clean since the crud collects on teh OUTSIDE of the condenser not inside the fan housing .

[3_tons]

dougrainer wrote:

3 tons wrote:

dougrainer wrote:

pianotuna wrote:
I'd go for 13500 as they can be run on a 15 amp circuit.

A 13.5 Brisk air pulls 13.1 amps at 95 degrees.
A 15k Brisk air pulls 14.2 amps at 95 degrees
So, why can't you run either on a 15 amp circuit????????????? Doug

Doug, my Coleman 11k Mach 1 P.S. is rated at 9.0 running amps with Lo-fan, but using a clamp-on meter (on source hot wire), I consistantly measure about 11.6a...Can you suggest a way to measure for winding leakage?

Thanks

No, I have no way to determine leakage Never heard that term or problem. YOUR RVP is a specific LOW amp RVP designed for 30 amp dual AC systems. The OP was asking about Dometic systems. Doug

Got it, Thanks.

[dougrainer]

3 tons wrote:

dougrainer wrote:

pianotuna wrote:
I'd go for 13500 as they can be run on a 15 amp circuit.

A 13.5 Brisk air pulls 13.1 amps at 95 degrees.
A 15k Brisk air pulls 14.2 amps at 95 degrees
So, why can't you run either on a 15 amp circuit????????????? Doug

Doug, my Coleman 11k Mach 1 P.S. is rated at 9.0 running amps with Lo-fan, but using a clamp-on meter (on source hot wire), I consistantly measure about 11.6a...Can you suggest a way to measure for winding leakage?

Thanks

No, I have no way to determine leakage Never heard that term or problem. YOUR RVP is a specific LOW amp RVP designed for 30 amp dual AC systems. The OP was asking about Dometic systems. Doug

[pianotuna]

Nec suggests 80% for continuous loads. 13.1 is more than that on a 15 amp circuit--and 14.2 is really pushing the envelope. I'm sure you know that voltage drop is bad for the motors in an air conditioner.

BTW my 13500 Dometic draws up to 1900 watts when it is hot outside. (actual watt meter measurement, real time) Even at 120 volts that is 15.83 amps. If it were a 15000 it might draw 17.59 amps--and that would trip a 15 amp breaker in short order.

No wonder the RV parks have problems with low voltage.

I fix low voltage with an autoformer. It makes my life easier.

dougrainer wrote:

pianotuna wrote:
I'd go for 13500 as they can be run on a 15 amp circuit.

A 13.5 Brisk air pulls 13.1 amps at 95 degrees.
A 15k Brisk air pulls 14.2 amps at 95 degrees
So, why can't you run either on a 15 amp circuit????????????? Doug

[3_tons]

dougrainer wrote:

pianotuna wrote:
I'd go for 13500 as they can be run on a 15 amp circuit.

A 13.5 Brisk air pulls 13.1 amps at 95 degrees.
A 15k Brisk air pulls 14.2 amps at 95 degrees
So, why can't you run either on a 15 amp circuit????????????? Doug

Doug, my Coleman 11k Mach 1 P.S. is rated at 9.0 running amps with Lo-fan, but using a clamp-on meter (on source hot wire), I consistantly measure about 11.6a...Can you suggest a way to measure for winding leakage?

Thanks

[dougrainer]

pianotuna wrote:
I'd go for 13500 as they can be run on a 15 amp circuit.

A 13.5 Brisk air pulls 13.1 amps at 95 degrees.
A 15k Brisk air pulls 14.2 amps at 95 degrees
So, why can't you run either on a 15 amp circuit????????????? Doug

[TomG2]

I went from a 13.5k to a 15k model and the only real difference I observed was that my Summer electric bill went from $150 to about "$170 a month.

[Happytraveler]

pianotuna wrote:
I'd go for 13500 as they can be run on a 15 amp circuit.

We have a 35ft. motorhome with ducted air and added a Atwood Air Command 13,500 BTU non-ducted Air Conditioner. We spend a lot of time in Palm Desert and the River. It is really nice having both airs running.

[ford_truck_guy]

duplicate

[pianotuna]

The 15 K is 10% more cooling. I'd stay with the 13500. I would use #10 wire for the install. I'd even consider dropping the size down to 11000 btus. I'd also consider a heat pump unit.

In many older campgrounds the pedestals only have 15 amp "additional" outlets. That makes running the 15k unit "iffy".

[Cummins12V98]

If the wiring is already there it most likely is 12ga 20A so go for the bigger one it will not have to work as hard. If adding run 12ga and 20A breaker.

[ford_truck_guy]

My thinking would be to go with the 15k... When 2 are not needed, you could alternate which one is used to possibly prolong the life...

If cost is not an issue, thats my choice

[pianotuna]

I'd go for 13500 as they can be run on a 15 amp circuit.