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Old 06-21-2022, 04:06 PM   #1
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CPAP backup

I thought I would share my CPAP setup in our 34' motor home for boondocking.
We used this system on our last trip out west Jan-Mar 2021. We were gone 81 days and only had access to electricity 10 of those.

Needless to say we do not like RV parks.

The first picture is what I have for a 12v connection under the bed and its connection to the house battery at the control center under the bed and auxiliary battery (currently a lead acid deep cycle group 27) in the driver side rear storage compartment. I can get a full 8 hours with my Resperonics System One set on 13 in with humidifier on 3 and one night with the humidifier turned off, at the point the battery is down to 12.1 We were fortunate enough to be able to charge the auxiliary battery enough with our 200w foldable Dokio solar panel. We did travel enough that the house batteries (2 new Trojan 6v) stayed up enough to keep the refrigerator and heater on. I will say we were on the ragged edge with this setup.
I have now added a 300w Dokio foldable solar panel to keep things charged much better.
I also put together and a new 12v CPAP backup that I can used at home if the power is out. It is a Weize 50ah lifepo4 in a Harbor freight ammo/tool box with USB and cigarette lighter outlets. I have ran it 2 nights with the humidifier and only goes down to 12.7 which is near 20% remaining. I have attached 3 pictures of it.
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Old 06-22-2022, 08:21 AM   #2
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Nice.

I am surprised how many of us are on CPAP.

I don't think I have seen that AMMO box at Harbor Freight. I need to look next time I am there. I am sure I can figure out some reason to need one of them.

I have a bunch of old, metal, military surplus ammo cans I picked up when I was working in a machine shop in college. They are great for many uses, but the new, plastic boxes are lighter and I think great for so many things.
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Old 06-22-2022, 03:55 PM   #3
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part number 64113
The battery posts will toucn the lid when folded down but I heated the spots where the touch and made a dimple for them to fit with a ball peen hammer.
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Old 06-22-2022, 04:58 PM   #4
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Cool set up.

I have a large battery bank, inline inverter and solar to run mine along with everything else.
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Old 06-26-2022, 04:15 PM   #5
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I have a respironics dream station. They actually work off 12 volts. I installed a dedicated line to a 12 volt outlet at the night stand. I have four 6v batteries which gives me 465ah of power. I've run my C-pap and my wife's C-pap(her's is 24v with manufacturers inverter to 12v)with humidifiers on all night while having the furnace set at 60 degrees(25 degrees outside)and I wake up with 85% of my battery bank left. Solar has me fully charged up by noon. My point being, i've never needed to be concerned about having a back up. I suppose if I did want a back up that dude you have there is pretty darned sweet!
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Old 06-27-2022, 11:22 AM   #6
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Quote:
Originally Posted by Vintage465 View Post
I have a respironics dream station. They actually work off 12 volts. I installed a dedicated line to a 12 volt outlet at the night stand. I have four 6v batteries which gives me 465ah of power. I've run my C-pap and my wife's C-pap(her's is 24v with manufacturers inverter to 12v)with humidifiers on all night while having the furnace set at 60 degrees(25 degrees outside)and I wake up with 85% of my battery bank left. Solar has me fully charged up by noon. My point being, i've never needed to be concerned about having a back up. I suppose if I did want a back up that dude you have there is pretty darned sweet!
I have the same CPAP unit. I only have 2 Trojan 6V house batteries so when I was out west, I barely could recharge things with my 200W solar. I now have 500w so it will be much better. Also, the main reason for this setup is in case we have a power outage at home and having an extra battery in the motor home is a bonus.
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Old 06-28-2022, 08:18 AM   #7
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Originally Posted by SiteTrek View Post
I have the same CPAP unit. I only have 2 Trojan 6V house batteries so when I was out west, I barely could recharge things with my 200W solar. I now have 500w so it will be much better. Also, the main reason for this setup is in case we have a power outage at home and having an extra battery in the motor home is a bonus.
I agree, two 6v's and 200w would be struggle. It took us about 3 years to finally get our power supply to match our power needs. Now days I seldom look at the battery power level with concern.....normally just look with a smile on my face. I'm sure you've read eslwere that the way the solar is configured has a huge.......and I mean huge factor on how well things charge. Our coach came with a dealer installed 300w of solar two 6v batteries. It didn't take long to see that this wasn't enough. Went to four 6v's and it was better, but not great. I completely re-did the solar adding an additional 150w panel, putting the existing controller in the pass thru and running #4 conductor from the roof to the controller in the pass thru did the trick. I think the relocation of the controller and running hefty high quality wire had as much to do with the improvement as the additional panel......Probably more.
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Old 06-28-2022, 08:44 AM   #8
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Nice setup. I have two 6volt batteries with a Renogy 200 watt solar suitcase for recharging during the day. However, when camping in areas that don't have much sun, I have a 2000 watt inverter generator so that I can fully recharge my batteries. I also have a Victron smart shunt to monitor battery usage.

System works great with no problems. I can run the CPAP machine with the furnace kicking on and off all night and still have plenty of power left in the morning.
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