Houston We have a Problem……… Or Do We?
Question:
> I wrote this for similar situations. > http://www.woa.com.au/terryc/remote-power/remote-power.html
your link doesn’t seem to be working — Beth in Australia =================== FAQ for alt.support.sleep-disorder can be found here http://talhost.net/sleep Newsgroup Archives http://talhost.net/sleep/archives.htm this site is a work in progress – feel free to submit info/articles Remove my name to reply
Response:
Tal wrote: > > I wrote this for similar situations. > > http://www.woa.com.au/terryc/remote-power/remote-power.html > your link doesn’t seem to be working
Nothing is working at (Fri, Sat and probably until Monday 9am in west coast Australia) because my ISP somehow dropped dns for woa.com.au sometime on Friday. Unfortunately I didn’t realise this until late Saturday. — Terry Collins {:-)}}} email: terryc at woa.com.au www: http://www.woa.com.au Wombat Outdoor Adventures <Bicycles, Computers, GIS, Printing, Publishing> "People without trees are like fish without clean water"
Response:
Terry Collins wrote: > Tal wrote: > > > I wrote this for similar situations. > > > http://www.woa.com.au/terryc/remote-power/remote-power.html > > your link doesn’t seem to be working
Fixed about 15:30 EST Sat 3/8/03
Response:
Laureen wrote: > Dh and I both use Cpaps. We just bought a new trailer. While all will > be fine as long as we are in a camp ground with power how do we swing > both of us using Cpaps in a more remote self contained place?? I have > read the archives about inverters and marine batteries but we’ll have > 2 of us pulling juice. Any ideas? TIA, Laureen
I wrote this for similar situations. http://www.woa.com.au/terryc/remote-power/remote-power.html Basically it does the calcs that you need to do. For the inital calculations, just add the wattages of your wifes and your CPAPs together. If it is greater than 12Amps( 12Vx 12Amps = 144Watts), then you will probably want two separate systems (I’m thinking you can easily get 120AmpHr deep discharge batteries). Compare two systems (some redundancy + back up that allows at least one to sleep), compared to one battery collection, one main inverter (efficencies). As already stated, you can not run a humidifier on an inverter, (maybe if you pay big $ for a good full sine wave inverter – your experiment). I seriously recommend ignoring solar panels. It is far worse that I knew at the time that I wrote the page. Basically the panels give max wattage at 17.? Volts, but nothing runs at that voltage. So no, you don’t have a problem, just a lack of knowledge. I found out from an auto electrician that it (batteries, etc) is a common installation in caravans in australia and CPAP is a big reason. — Terry Collins {:-)}}} email: terryc at woa.com.au www: http://www.woa.com.au Wombat Outdoor Adventures <Bicycles, Computers, GIS, Printing, Publishing> "People without trees are like fish without clean water"
Response:
On Wed, 30 Jul 2003 12:46:56 -0700, "Quick" <dhorw…@NOSPAMcisco.com> wrote: >It should be *way* less. The draw will actually be dependent >on your pressure. The amp figure on the label on the machine >is usually peak draw. For example my machine says 1 amp at >120V. That should be around 10 Ah at 12V. >From the respironics page they say to use a 100 Ah battery. >For my machine they say it should be able to provide approx. >32 hours of use (at all pressures). That would be around 3 times >what you would expect from the 1 amp at 120V from the label. >right? or did I screw up somewhere? >-Quick (NOT a rocket scientist)
True… the battery only has to handle the average draw, while the inverter has to be able to handle the initial inrush current. That’s what I get for reading the nameplate and extrapolating. 
Response:
"Charles Perrin" <c.l.perrin…@att.net> wrote – Hide quoted text — Show quoted text -> On Wed, 30 Jul 2003 12:46:56 -0700, "Quick" <dhorw…@NOSPAMcisco.com> > wrote: > >It should be *way* less. The draw will actually be dependent > >on your pressure. The amp figure on the label on the machine > >is usually peak draw. For example my machine says 1 amp at > >120V. That should be around 10 Ah at 12V. > >From the respironics page they say to use a 100 Ah battery. > >For my machine they say it should be able to provide approx. > >32 hours of use (at all pressures). That would be around 3 times > >what you would expect from the 1 amp at 120V from the label. > >right? or did I screw up somewhere? > >-Quick (NOT a rocket scientist) > True… the battery only has to handle the average draw, while the > inverter has to be able to handle the initial inrush current. That’s > what I get for reading the nameplate and extrapolating.
Heh, thats OK. I certainly want my rocket engineered for the worst case -:) -Quick
Response:
- Hide quoted text — Show quoted text -"Quick" <dhorw…@NOSPAMcisco.com> wrote in message <news:1059594482.437522@sj-nntpcache-3>… > It should be *way* less. The draw will actually be dependent > on your pressure. The amp figure on the label on the machine > is usually peak draw. For example my machine says 1 amp at > 120V. That should be around 10 Ah at 12V. > From the respironics page they say to use a 100 Ah battery. > For my machine they say it should be able to provide approx. > 32 hours of use (at all pressures). That would be around 3 times > what you would expect from the 1 amp at 120V from the label. > right? or did I screw up somewhere? > -Quick (NOT a rocket scientist) > "Charles Perrin" <c.l.perrin…@att.net> wrote > > On 29 Jul 2003 12:01:26 -0700, TheBenne…@olypen.com (Laureen) wrote: > > >Dh and I both use Cpaps. We just bought a new trailer. While all will > > >be fine as long as we are in a camp ground with power how do we swing > > >both of us using Cpaps in a more remote self contained place?? I have > > >read the archives about inverters and marine batteries but we’ll have > > >2 of us pulling juice. Any ideas? > > With a subject title like that, you had to get a rocket scientist to > > answer. > > I suspect you can get by with a larger inverter and a marine battery. > > I know ResMed calls out 200 W peak for the Sullivan V, so double to > > get 400 W. > > 400 W out of a 12 V battery is 33 amps. > > You need 33 amps for 8 hours = 266 amp hours, but I don’t think it > > needs near that much as (IIRC) people report running a single CPAP > > more than one night on a single marine battery charge.
Ok I’m a 10 and he’s a 5 ( that sounds funny eh?) We both use a Remstar LX. He is thinking maybe he can go without. He has had his machine turned down after weightloss and a new sleep study. I on the other hand have gone from 8 to 10 recently. So tell me this you smart people ( I dont know what I would have done without you guys in here in the beginning as I am not a newbie) We have a boat with a marine battery but how does the wiring jive? What do I need to buy? If I go without I’m in trouble not to say how I will be snoring and sucking curtains in from everyones RV in the camp ground LOL. WHere do I buy an e=inverter. Sorry for the ignorance And BTW TIA! Laureen
Response:
Laureen wrote: > Ok I’m a 10 and he’s a 5 ( that sounds funny eh?) We both use a > Remstar LX. He is thinking maybe he can go without. He has had his > machine turned down after weightloss and a new sleep study. I on the > other hand have gone from 8 to 10 recently. So tell me this you smart > people ( I dont know what I would have done without you guys in here > in the beginning as I am not a newbie) We have a boat with a marine > battery but how does the wiring jive? What do I need to buy? If I go > without I’m in trouble not to say how I will be snoring and sucking > curtains in from everyones RV in the camp ground LOL. WHere do I buy > an e=inverter. Sorry for the ignorance > And BTW TIA! > Laureen
Laureen, For inverter information (basic) go to – <http://www.recordersplus.com/html_doc/power_inverters/gax_home.html> For battery information go to – http://www.uuhome.de/william.darden/ I would suggest finding a local person that’s knowledgeable about these things as far as what size of the correct components you need, also where and how to properly mount, vent and wire them. — Bob Gootee When you get to the end of your rope, tie a knot and hang on.
Response:
Do a search on Sleepnet. There are calculations there which can tell you how much battery you need for the current requirements of your CPAP. BTW, if you use a heated humidifier, give up on using it with battery power. Not gonna happen. regards, eric pearson db2e…@nospammindspring.com On 29 Jul 2003 12:01:26 -0700, TheBenne…@olypen.com (Laureen) wrote: – Hide quoted text — Show quoted text ->Dh and I both use Cpaps. We just bought a new trailer. While all will >be fine as long as we are in a camp ground with power how do we swing >both of us using Cpaps in a more remote self contained place?? I have >read the archives about inverters and marine batteries but we’ll have >2 of us pulling juice. Any ideas? TIA, Laureen
Response:
Laureen wrote: > Dh and I both use Cpaps. We just bought a new trailer. While all will > be fine as long as we are in a camp ground with power how do we swing > both of us using Cpaps in a more remote self contained place?? I have > read the archives about inverters and marine batteries but we’ll have > 2 of us pulling juice. Any ideas? TIA, Laureen
Laureen, Besides what Eric had to say, they have solar cells for RV roofs to recharge batteries. They do run some big bucks for the higher output ones but as they say, you get what you pay for. Take a look at – http://www.trailerlife.com/ This was an excellent magazine when I was RVing some years ago. — Bob Gootee When you get to the end of your rope, tie a knot and hang on.
Response:
On 29 Jul 2003 12:01:26 -0700, TheBenne…@olypen.com (Laureen) wrote: >Dh and I both use Cpaps. We just bought a new trailer. While all will >be fine as long as we are in a camp ground with power how do we swing >both of us using Cpaps in a more remote self contained place?? I have >read the archives about inverters and marine batteries but we’ll have >2 of us pulling juice. Any ideas?
With a subject title like that, you had to get a rocket scientist to answer. I suspect you can get by with a larger inverter and a marine battery. I know ResMed calls out 200 W peak for the Sullivan V, so double to get 400 W. 400 W out of a 12 V battery is 33 amps. You need 33 amps for 8 hours = 266 amp hours, but I don’t think it needs near that much as (IIRC) people report running a single CPAP more than one night on a single marine battery charge.
Response:
It should be *way* less. The draw will actually be dependent on your pressure. The amp figure on the label on the machine is usually peak draw. For example my machine says 1 amp at 120V. That should be around 10 Ah at 12V. From the respironics page they say to use a 100 Ah battery. For my machine they say it should be able to provide approx. 32 hours of use (at all pressures). That would be around 3 times what you would expect from the 1 amp at 120V from the label. right? or did I screw up somewhere? -Quick (NOT a rocket scientist) "Charles Perrin" <c.l.perrin…@att.net> wrote – Hide quoted text — Show quoted text -> On 29 Jul 2003 12:01:26 -0700, TheBenne…@olypen.com (Laureen) wrote: > >Dh and I both use Cpaps. We just bought a new trailer. While all will > >be fine as long as we are in a camp ground with power how do we swing > >both of us using Cpaps in a more remote self contained place?? I have > >read the archives about inverters and marine batteries but we’ll have > >2 of us pulling juice. Any ideas? > With a subject title like that, you had to get a rocket scientist to > answer. > I suspect you can get by with a larger inverter and a marine battery. > I know ResMed calls out 200 W peak for the Sullivan V, so double to > get 400 W. > 400 W out of a 12 V battery is 33 amps. > You need 33 amps for 8 hours = 266 amp hours, but I don’t think it > needs near that much as (IIRC) people report running a single CPAP > more than one night on a single marine battery charge.
Response:
Dh and I both use Cpaps. We just bought a new trailer. While all will be fine as long as we are in a camp ground with power how do we swing both of us using Cpaps in a more remote self contained place?? I have read the archives about inverters and marine batteries but we’ll have 2 of us pulling juice. Any ideas? TIA, Laureen
