Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-19-2015, 09:36 AM   #1
Winnebago Camper
 
Join Date: Nov 2014
Location: Bayfield, CO
Posts: 17
Inverter Question

The GF and I both use CPAP machines at night. How can I determine if the 1000 watt inverter in the new MH will provide adequate power for both units, and for how long, without depleting the house batteries?

Yeah, I'm a newb
__________________
Greg & Cindy
Bayfield, CO
2015 Sightseer 30A
mtnfan is offline   Reply With Quote
Old 02-19-2015, 09:41 AM   #2
Winnebago Owner
 
wb7auk's Avatar
 
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 82
Quote:
Originally Posted by mtnfan View Post
The GF and I both use CPAP machines at night. How can I determine if the 1000 watt inverter in the new MH will provide adequate power for both units, and for how long, without depleting the house batteries?

Yeah, I'm a newb
You need to know the power requirements of both units and the total amp
hours of your battery system.
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
wb7auk is offline   Reply With Quote
Old 02-19-2015, 09:58 AM   #3
Winnebago Camper
 
Todd157k's Avatar
 
Join Date: Jan 2015
Location: So.Cal.
Posts: 40
Some of the CPAP machines have DC power in. If you do, it would be better to run off that. You still need to know the power draw as stated above to answer your question.
__________________
2013 Itasca Sunova 30A
2006 Crownline 250cr
2012 Ram Laramie Longhorn
Todd157k is offline   Reply With Quote
Old 02-19-2015, 10:32 AM   #4
Winnebago Owner
 
Join Date: Jul 2014
Posts: 200
Almost everything electric powered has a watt rating somewhere on it.


If you find it, double that number for two. That's the minimum watt inverter you need. Add about 25% for insurance.


Now the watts you are using, plus 10%, can be converted into amps. Watts / Volts = Amps

Knowing the amps it is using, you add up the hours it will be running to get AH (amp hours).

Next is to find out how many amp hours your battery bank has. Take that number and cut it in half, so you only use half of your capacity, and not damage your batteries.

You also need to factor in everything else, using power while you are sleeping, and any power you used, since fully charging them.

EX: each uses 200 watts. 400 watts / 12 volts = 34 Amps. 34 amps, times 8 hours sleeping = 272 AH. So you need at least a fully charged bank of batteries equal to 544 AH for the night.

That would be a bank of 6, 6 volt batteries or 3 LARGE 12 volt ones. Hopefully your machines use less watts then my example.

Good luck
twinboat is offline   Reply With Quote
Old 02-19-2015, 01:57 PM   #5
Winnebago Camper
 
Join Date: Nov 2014
Location: Bayfield, CO
Posts: 17
Thanks, twinboat. You provided very succinct, helpful info. I didn't see any power info on the units, so I'll have to check the instruction books...wherever they are. Thanks, again.
__________________
Greg & Cindy
Bayfield, CO
2015 Sightseer 30A
mtnfan is offline   Reply With Quote
Old 02-19-2015, 02:14 PM   #6
Winnebago Camper
 
Join Date: Nov 2010
Location: hanson ma
Posts: 5
cpap

my wife and I both use cpaps and we sleep parked off the grid when travling and have no problem running the machines through my inverter I know that thay run on 12v I just have not done the wiring.checked power rating on mine is 12v-5amp
hometool is offline   Reply With Quote
Old 02-19-2015, 02:22 PM   #7
Winnebago Owner
 
Join Date: Jul 2014
Posts: 200
Mtnfan,

If the machines use a little wall block plug, they have a watt or amp rating on them.

Good luck
twinboat is offline   Reply With Quote
Old 02-19-2015, 04:33 PM   #8
Winnebago Owner
 
vsheetz's Avatar
 
Join Date: Jun 2012
Location: SoCal
Posts: 227
The consumption ratings listed on devices is a good initial guide to power usage, but often is not correct.

A killawatt meter gizmo is very handy to have. Plug the killawatt gizmo into a 120vac outlet, then plug the device in question into the killawatt gizmo. It will show the watts/amps being drawn. It can also show the usage over time (kilowatt hours) which is valuable for devices that cycle on and off, such as a refrigerator.

About $30 from Amazon, Home Depot, etc.
__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
vsheetz is offline   Reply With Quote
Old 02-20-2015, 01:05 PM   #9
Winnebago Master
 
Join Date: Jun 2003
Location: Palisade CO
Posts: 895
Each of the following - my Respironics System One series 60 , my old M Series Pro, and my wife's Resmed S9, each using the humidifier will operate on a 300 watt inverter - singly, not all at once. Resmed used to require a pure sine wave inverter while Respironics did not.
Since we are now out of the game RV wise I have not checked to see if Resmed still requires a PSW inverter or not. Running a 12 volt line was not easy in my particular motor home and using an inverter was.

The current pulled depends on the average pressure (average for an autopap, constant otherwise) and the humidifier settings. The current required listing seems to be a maximum rating not necessarily what you will use.
I used to be able to get an eight hour nights use from two six volt Trojan batteries (in series of course). Might have gone longer but never tried.
__________________
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
Clay L is offline   Reply With Quote
Reply

Tags
inverter


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Inverter/Question Ron and Patti Electrical | Charging, Solar and Electronics 11 02-12-2008 12:53 PM

» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Winnebago Industries or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 10:46 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×