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Old 11-23-2014, 08:50 PM   #15
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We just spent over 3 weeks in Michigan in our daughter's driveway plugged into an outlet in the garage. It was bitterly cold the entire time, getting down to 11 one night. We are Floridians and my husband kept the furnace thermostat at 76. The house breaker flipped when we were using an electric heater (because the furnace quit working) and my son-in-law turned on garage lights and plugged in his electric drill. We were using an extension cord, so we turned the RV around and backed it closer to the house eliminating the need for the extension cord. After that we did not have a problem, but tried to be very careful to not overuse other electric in the RV until we were able to get the furnace serviced. Once the furnace was fixed, The fridge, flat screen TV and lights were on most of the time and the furnace ran A LOT. If using the Microwave we tried to remember not to try it while the coffeemaker was brewing. I also added a second house battery because on our trip up, the battery seemed like it needed recharging during the night. On the trip home, the furnace ran all night without a generator start. It was a major pain to have to go out and get the LP tank filled every few days. I would say that next time we will try locate someone that does mobile refills, but we do not intend to visit the north again during this time of year. I do not know how much power a CPAP uses, but it seems like it would not be more than all of the things we were using with the furnace.
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Old 11-23-2014, 10:59 PM   #16
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RayJr
WHAT "UNIT" will do that...and exactly how will the house "let you know" if you're using "too much" power?
Puzzled!
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My inverter shuts down if I use to much power or the battery goes dead as a safety feature. I also get this annoying alarm that keeps going off if the battery is getting to low. A clear indication I need to plug in for a charge. My inverter also has a red led that blinks when battery levels drop.
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Old 11-25-2014, 07:52 PM   #17
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If you have no household electric available those two group 27s are not gonna cut it with the CPAP and furnace.

That said, you didn't give any information about the coach to help determine how hard it will be to heat.

My last truck camper had two group 27s and they would keep up with the furnace overnight in 15 - 30 degree weather, but nothing more.
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Old 11-26-2014, 07:28 AM   #18
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Here is what we do. I take a portable power supply for DH Cpap machine. I keep heaters set at 50 at night and use a down comforter since we have a MSW inverter. We minimize use of anything not essential. I monitor the house batteries and do not let them drop below 12.2 and we have learned over time we can make it from 10 pm until 6 am. I do have to start the generator to recharge the batteries in the am and let it run for 2 hours. I use that time to make coffee, use the MW if needed, take a bath and anything else. Then I am set until evening when we hit the bed. We are out all day with the family. It has worked for us for a few years now. I do have to run the generator though since we don't have access to 120. Besides, I have to have my coffee in the morning and I can't wait long enough for those kids of ours to get up.
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That is proper energy management.
BTW, we "make coffee" on the LP stove...(no 120V needed).
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Old 11-26-2014, 08:07 AM   #19
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My unit is a 30 ft. Minnie-Winnie 430V Class C with two slides.
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Old 11-26-2014, 08:11 AM   #20
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Here is what we do. I take a portable power supply for DH Cpap machine. I keep heaters set at 50 at night and use a down comforter since we have a MSW inverter. We minimize use of anything not essential. I monitor the house batteries and do not let them drop below 12.2 and we have learned over time we can make it from 10 pm until 6 am. I do have to start the generator to recharge the batteries in the am and let it run for 2 hours. I use that time to make coffee, use the MW if needed, take a bath and anything else. Then I am set until evening when we hit the bed. We are out all day with the family. It has worked for us for a few years now. I do have to run the generator though since we don't have access to 120. Besides, I have to have my coffee in the morning and I can't wait long enough for those kids of ours to get up.
The idea of the portable power supply sounds good for both CPAP
and emergency. What size portable are you talking here? Thanks.
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Old 11-26-2014, 08:30 AM   #21
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We just drycamped/boondocked for three days with very little sun. We have a little over 400 amp/hrs of battery storage. We have a trimetric meter and knew we were leaving on the third day so we didn't have to minimize our usage of power.

TV/ant/dvd about 8amps
coffee maker 75amps
lights 6amps
cpap (have to double check this one but didn't drain batteries much at all)
furnace 12amps

By the third day we were down to 70% on the trimetric. With more sun and a little conservation we could make due with just our 200 watts of solar. We may put a few more panels on the roof.
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Old 12-03-2014, 05:43 PM   #22
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We did the same, stayed outside the daughter's house. I ran my heater for two days in very cold weather on batteries with no problem, only dropped to 11 vdc. The only thing that uses the battery is the fan and thermostat. Of course we were in the daughters house most of the time so we only needed the heater for a few hours each night.
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Old 12-05-2014, 08:09 AM   #23
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... only dropped to 11 vdc.
Don and Barb, I suspect that the voltage of your batteries wasn't really 11v. Hopefully after they sat unused for a few minutes they were at least 12v. Anything under 12 (SOC after sitting unused) is typically lower than suggested.

I know your main point (which I agree with) was running the furnace for a few hours only takes 10 -15 amp hours. (That's assuming the furnace is only running about 20 minutes each hour)
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Old 12-05-2014, 09:56 AM   #24
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The idea of the portable power supply sounds good for both CPAP
and emergency. What size portable are you talking here? Thanks.
I'm sorry for the delayed response-been out of town. What I use is one of those portable power failure backups generally used for a house. Mine is so old that I can't remember it's output wattage. It has several outlets, a connection to blow up tires (not MH!), a flashing emergency light and more. I know you have seen one of these before at Home Depot, Lowe's or the like. Mine is now about 9 years old and still works great.
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Old 12-05-2014, 10:45 AM   #25
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A good down comforter goes a long way towards keeping warm through the night, while keeping the thermostat turned down.


Our coach has two furnaces, one for the bedroom/bathroom, other for main living area. We run just the bedroom/bathroom one when dry camping on cold nights.
Agree with that also. A great down comforter keeps us very toasty into the 20's. We then power up a very compact yet powerful electric heater upon waking. I never use LP for heat if there is electricity available even 110.
As long as it warms up to well above freezing, I'm not worried about pipes freezing. But we're in Cali and enjoying 60s
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Old 02-04-2015, 08:19 PM   #26
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We have a 41 ft class A with 4 slides. We park for 2 weeks the first of December every year at our friends house in northeast Pa. We plug into his 120 outlet in his garage. We switch our hot water heater and fridge over to LP. My son and I both use cpap machines. We have never tripped his breaker. The big problem we had was running out of propane after 5 days. We kept the temp at 74 degrees. We also have heated tank bays. You will want to keep a close eye on your propane level.
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Old 02-05-2015, 06:17 PM   #27
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furnace up north

We had to take the RV out to fill propane about every 5 days when we stayed in Michigan in November for three weeks. I do not think we will EVER go there in the winter again, but if we do, I will try to find a company that will bring the gas to us. It is just too cold to prepare the "ship" to venture out for gas every 5 days. We tried using an electric heater, but that just could not keep the place warm enough with temps that low. It was below 20 most of the time and never got above freezing the entire time.
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