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2 A/C's
Jun 15, 2019 20:35:20 GMT -5
Post by Edd505 on Jun 15, 2019 20:35:20 GMT -5
Raise your hand if you have heard you can't run 2 A/C's on 30 amps, OK, so had I. Buddy with a power management i his class a says the A/C draws 13amps running. Hummmm. 1 A/C 13 amps so 2 AC's should be 26amps, worst can happen I trip the breaker. Turned of all electric, fridge, fans, etc. Ran one A/C set way down, 60's and fired off the second. 97 out side one A/C 84 second got us down to 76 before wife says she's cold. I did turn on the TV with both running.
Someone with more electrical knowledge maybe able to explain. My guess is as long as the compressor is not cycling the 30amp circuit will hold. 
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2 A/C's
Jun 16, 2019 9:54:43 GMT -5
Post by Chuck on Jun 16, 2019 9:54:43 GMT -5
Edd, I have never tried it but you logic sounds reasonable, suppose you could run your frig on propane instead of electric an as you say the worse that could happen is you trip the breaker at the post  Safe Travels & happy father day Chuck |
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2 A/C's
Jun 16, 2019 13:32:06 GMT -5
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Post by kaboom on Jun 16, 2019 13:32:06 GMT -5
I've ran both AC units on a 30amp service numerous times with out an issue. I have a Progressive Ind. EMS-PT30c and the digital display shows 26amps with the two AC's, TV and satellite receiver on. I start one AC unit and wait a little while then start the second .
Saving up for a EMS-PT50.
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Greg
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Posts: 39 
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2 A/C's
Jun 16, 2019 18:56:44 GMT -5
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Post by Greg on Jun 16, 2019 18:56:44 GMT -5
Someone is forgetting that the AC utilizes 12v power for the thermostat and will trigger the DC converter to run as well. With the eclectic. Of units with manual controls, or replacing them with battery units. Otherwise, you can lay money on it that the DC converter will be running at some point along with the AC units, because the are plenty of other items in the RV that are pulling 12v power. I believe they also pull in the range of 6 amps?? So now we are up to 32 amps at a minimum.
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Post by Edd505 on Jun 20, 2019 21:22:28 GMT -5
Someone is forgetting that the AC utilizes 12v power for the thermostat and will trigger the DC converter to run as well. With the eclectic. Of units with manual controls, or replacing them with battery units. Otherwise, you can lay money on it that the DC converter will be running at some point along with the AC units, because the are plenty of other items in the RV that are pulling 12v power. I believe they also pull in the range of 6 amps?? So now we are up to 32 amps at a minimum. Ran all day without issue. If it's just the A/C's I doubt the thermostats drawing 6amps and next to nothing keeping the house batteries topped off. My surge protector does not give an amp read out just pass/fail. Again, worst that happened would be a tripped beaker. 101 Degrees with only 30 amp available, it was worth a try. |
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Greg
Newbie RV’er
Posts: 39
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2 A/C's
Jun 24, 2019 18:51:11 GMT -5
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Post by Greg on Jun 24, 2019 18:51:11 GMT -5
Someone is forgetting that the AC utilizes 12v power for the thermostat and will trigger the DC converter to run as well. With the eclectic. Of units with manual controls, or replacing them with battery units. Otherwise, you can lay money on it that the DC converter will be running at some point along with the AC units, because the are plenty of other items in the RV that are pulling 12v power. I believe they also pull in the range of 6 amps?? So now we are up to 32 amps at a minimum. Ran all day without issue. If it's just the A/C's I doubt the thermostats drawing 6amps and next to nothing keeping the house batteries topped off. My surge protector does not give an amp read out just pass/fail. Again, worst that happened would be a tripped beaker. 101 Degrees with only 30 amp available, it was worth a try. The startup of the units where you’d see the most power draw. I’d imagine he has soft starts installed in them? The power management system should also keep one from starting at the same time as the other, like a large 50a unit with 3 ACs. I am just pointing out that avoiding use of 120v and using 12v power to supplement in some way still leaves the potential for an additional draw 120 draw through the converter. Ie: Light, LP water heater, LP or Inverter Fridge, awnings, exhaust fan, etc.. Many things that consume 12v power and can be overlooked. Rough numbers, but A 120v 800 watt converter= 6.6 amps with a 60a 12v output if I am not mistaken. All be it unlikely you would see the full draw from the DC converter, but it is just something to be aware of. |
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Post by Edd505 on Jun 24, 2019 20:35:45 GMT -5
The startup of the units where you’d see the most power draw. I’d imagine he has soft starts installed in them? The power management system should also keep one from starting at the same time as the other, like a large 50a unit with 3 ACs. I am just pointing out that avoiding use of 120v and using 12v power to supplement in some way still leaves the potential for an additional draw 120 draw through the converter. Ie: Light, LP water heater, LP or Inverter Fridge, awnings, exhaust fan, etc.. Many things that consume 12v power and can be overlooked. Rough numbers, but A 120v 800 watt converter= 6.6 amps with a 60a 12v output if I am not mistaken. All be it unlikely you would see the full draw from the DC converter, but it is just something to be aware of. No soft start, stock 15K Coleman's. I did start one let it stabilize on continued run (set to 65) before starting the second. I have 30 amp & 50 amp cords and was using the 30 amp. I did heat some so next time I'll try the 50AMP. Only thing left was the 18cuft fridge on LP, no lights or anything else during the day. Evenings cool so one A/C will work. I have no EMS (wish I did) just a 50 amp surge protector. |
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Greg
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Posts: 39
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2 A/C's
Jun 24, 2019 22:04:35 GMT -5
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Post by Greg on Jun 24, 2019 22:04:35 GMT -5
[quote source="/post/19363/thread" No soft start, stock 15K Coleman's. I did start one let it stabilize on continued run (set to 65) before starting the second. I have 30 amp & 50 amp cords and was using the 30 amp. I did heat some so next time I'll try the 50AMP. Only thing left was the 18cuft fridge on LP, no lights or anything else during the day. Evenings cool so one A/C will work. I have no EMS (wish I did) just a 50 amp surge protector. [/quote] Did you notice any heating at the Surge Guard or 30/50 adapter? I would have to agree that your 50a cable would be better to use than the 30, but much more expensive to replace if it gets too hot. Still impressive that you are able to run two 15k units on 30a. Ultimately, I suppose it is no worse than me running a single 15k on a 20a outlet, but I do run a 10 gauge industrial extension cord for it. Hopefully things cool down for you soon! |
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2 A/C's
Jun 25, 2019 13:16:20 GMT -5
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Post by kaboom on Jun 25, 2019 13:16:20 GMT -5
I have the original 15k coleman AC units. No soft start. I plug the EMS into the pedastal. Then a 30 to 50 dog bone then the 50 amp cord. I have checked for heat at the pedastal, dog bone and cord. All were fine no heat detected. The appliances are set to propane.
I trust that between the pedastal breaker and the EMS I'm safe. Worst case the EMS shuts off power or the breaker trips.
One time I was staying at a friend's property and only had a 20amp outlet about 50' away. So I ran a 20 to 30 adapter. Then the EMS, then a 25' 30 amp cord, a 30 to 50 dog bone, then the 50 amp cord. Turned appliances to propane. We ran everything we needed just fine.
Just because I was curious I switched on one AC unit. The EMS Shut the power off but did not show a trouble code. I contacted Progressive Ind. I was told that the EMS sensed excessive resistance due to all the adapters and long run of cords so it shut off for protection.
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Post by Edd505 on Jun 25, 2019 21:49:07 GMT -5
Greg I have a 25ft 30amp cord I used and I did note it was warm to the touch. If I run into this again I'll use the 50amp cord and adapters. I normally reserve sites w/50amp but had business in the area and to what was available. |
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2 A/C's
Jul 31, 2019 11:25:03 GMT -5
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Post by fredieboy84 on Jul 31, 2019 11:25:03 GMT -5
2 AC units 30amp, just nothing else unless you have access to 2 30amp outlets I bought a 2 30amp plug to 50amp adapter.
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