Headhunter
RVF Supporter
- Joined
- Jul 18, 2021
- Messages
- 539
- Location
- Northeast PA
- RV Year
- 2021
- RV Make
- Tiffin
- RV Model
- Red 33 AA
- RV Length
- 35 ft
- TOW/TOAD
- 2017 Jeep Sahara
- Fulltimer
- No
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I ran the coach on 30 amp when we were out west,, but it was for heat not AC. I have twp propane furnaces so it was fine. So I shut off the rear AC and let the front one run overnight. But first I brought down the temperature running both ACs with my generator for a couple of hrs.Nice Rig! How was the Harvest Host? On 30 amps my rig won't run both ACs either.
Ok I never heard of this before. What is involved in installing easy start to your AC units? How much does it cost?If you find yourself in a position of frequent 30amps like I do, then adding a easy start to the air units will let you run 2 on 30amp.
careful ! soft starts are just that, designed to control the inrush current needed to start the air conditioner. They will not reduce the required power needed by the air conditioners to actually run.That said, consider Furrions Chill Cube 18K, you can run 2 of these units on a 30 amp service right out of the box.If you find yourself in a position of frequent 30amps like I do, then adding a easy start to the air units will let you run 2 on 30amp.
Careful….Newmar is not compatible with Furion.careful ! soft starts are just that, designed to control the inrush current needed to start the air conditioner. They will not reduce the required power needed by the air conditioners to actually run.That said, consider Furrions Chill Cube 18K, you can run 2 of these units on a 30 amp service right out of the box.
Careful….Newmar is not compatible with Furion. Please help me understand, Newmar is the company that makes coach? and do they use some other kind of roof top air conditioners then all the other RV manufacturers? Sorry i know nothing about these coaches or motor homes, i assumed they used a standard roof top air conditioner mounting over a 14x14 cutout.
I personally love the furion, but that won’t help the OP. Again, please help out here, " OP ? "
And soft starter does resolve the issue as the in rush is the problem.
I only need 11amps to run a single 15k air unit or 33 to run all 3... 33 amps at 120volts is 3,960 watts, that's not going to work on a 30 amp circuit, and if the voltage is under 120 volts, then is going to fail even faster as Ohms Law tells us the lower the voltage the higher the Amperage.
This is down from the 21 starting and 18 running that I had before. The run would eventually lower itself to 14-15amps but never 11 as it does with soft starter.11 amps = 1320 watts x 3 units is 3960 watts which = 33 amps, that's 3 amps over a 30 amp breaker and also exceeds the 10 gauge wire 30 amp max rating generally found on the 30 amp RV park/shore power connecting chord.Again this math all assumes your actually getting 120 volts, as I mentioned before, my life experience has shown me most RV parks are often lower then 120 volts, especially during high occupancy and hot weather.
So for a Newmar owner or any other owner that wants to resolve the problem for $250 approx per unit, easy start is a great solution.I would not disagree with this, Im just saying be careful because the math required to run 3 units exceeds circuit size.Id hate to see someone spend 750.00 to later find out he/she is reseting a 30 amp breaker every 5 minutes.
If you have a non Newmar and don’t utilize central control from RV-C or KIB then you may be able to change to a furion chiller, which is arguably the best unit made today.I agree you can't find any 18K 120 volt roof top unit to run on 1450 watts MAX
Thank you for sharing this information and your experience. I had no idea with no experience related motorhomes or coaches, I was just attempting to learn more and share knowledge.Yes, Newmar are very different. They only work with Dometic Penguin 2 and the upcoming dometic
Replacement with a retrofit kit. They have the mounting plates built into the construction and a dedicated plenum for the ducting. Further the electronics that control thermostat, auto generator start, and power management only work with dometic ccc2 controlled units, which is only the penguin 2 units. My responses would be " Off Topic " but im pretty sure all of these things could be overcome if an owner would like a more efficient unit for cooling.
The OP (original poster) has an tiffin that is trying to run 2 air. This is possible by running the easy start. OP, Original Poster thank you
Your math is correct regarding 3 units, but that was not the point of the post. The point is to get 2 units on 30 amp.Sorry I chimed in, wont happen again.
Not all newmars have 3 air, but those that do benefit by having all 3 air on the easy start allowing the user to determine which pair of air to run.
During the day I run the front and middle. At night I run the rear and middle.