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Old 10-06-2012, 12:44 PM   #15
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Thumbs up I,ll have to check that out!

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Originally Posted by xctraveler View Post
The problem I had with my CPAP on my current coach was that the inverter was drawing as much as the CPAP. I do not use the humidifier with heater. I installed a 12v source next to the bed. My CPAP has a 12V input. Rather than pay $$$ for the mfg cord I went to RadioShack and bought a 12V cord with standard power point on one end and a power tip that matches my CPAP on the other. I can turn off the inverter overnight and the CPAP and other modest 12V draws are no issue. did this on the prior coach which only had 2 6V Trojans and never had a problem there, current coach has 4 6V Interstates.
I'll have to check and see the next time we replace the cpap that I get one with a 12v power supply! Thanks
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Old 10-06-2012, 04:21 PM   #16
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Originally Posted by rvfunhunter View Post
I'll have to check and see the next time we replace the cpap that I get one with a 12v power supply! Thanks
Many do, take a look at the back of yours for a round power port. They don't advertise the availability for some reason.
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Old 10-06-2012, 05:30 PM   #17
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Post 12v on Cpap only!

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Originally Posted by xctraveler View Post
Many do, take a look at the back of yours for a round power port. They don't advertise the availability for some reason.
There is a 12 volt for the Cpap but not for the heater. Thanks for the information I'll check this out for the heater too.
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Old 10-07-2012, 04:38 AM   #18
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I still have power and the display shows 11.4 v
This is a symptom rather than a cause. Still the same symptom with two new batteries so unlikely to be due to a dud cell.

I might have missed it, but has anyone suggested part of the reason might be that the batteries are not being charged up properly in the first place. A fixed voltage converter does a good job of keeping fully-charged batteries fully charged, but a fairly poor job of recharging flat batteries unless you have a couple of days to spare. Even something like a 30 amp three-stage charger would take about 12 hours to fully recharge dead flat batteries of around 240 Ah capacity.

Plenty of people run CPAPs with fairly rudimentary 12V systems, but only if they don't use the humidifier/heater. With that in the circuit, you would need to double or even triple the size of your battery storage, especially if running off an inverter
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Old 10-07-2012, 08:43 AM   #19
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What did the batteries read before bed time? If it showed over 12 volts, that's not good enough. 12.1 volts is already ~50% discharged.
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