[Texascavers] electronic question - help requested

2012-11-18 Thread Geary Schindel
Folks, Sue and I are heading out camping this Thanksgiving and have a camping/caving related question for the electronics gurus in the group. Sue has a sleep apnea machine she uses. We've used a marine battery that has worked for as long as a week without charging. I checked the amp hour

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread Logan McNatt
Death Valley for Thanksgiving? Does that mean you'll be having turkey vulture for dinner? On 11/18/2012 10:37 AM, Geary Schindel wrote: Folks, Sue and I are heading out camping this Thanksgiving and have a camping/caving related question for the electronics gurus in the group. Sue has a

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread George D. Nincehelser
I'm on the road so I can't give a detailed answer, but Resmed has an online guide for battery sizing. http://www.resmed.com/us/assets/documents/service_support/battery_guide/198103_battery-guide_glo_eng.pdf Let me know if you need more help and I'll look closer when I hit a motel. I'm

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread Mark Minton
Geary, Since the amperage is the same (2.5) for both 110 v and 12 v, my guess is the machine is running on 12v and has an internal transformer to cut down mains voltage. That being the case, it would be rather inefficient to use an inverter to raise 12 v to 110 only to cut it back

[Texascavers] electronic question - help requested

2012-11-18 Thread Geary Schindel
Folks, Sue and I are heading out camping this Thanksgiving and have a camping/caving related question for the electronics gurus in the group. Sue has a sleep apnea machine she uses. We've used a marine battery that has worked for as long as a week without charging. I checked the amp hour

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread Logan McNatt
Death Valley for Thanksgiving? Does that mean you'll be having turkey vulture for dinner? On 11/18/2012 10:37 AM, Geary Schindel wrote: Folks, Sue and I are heading out camping this Thanksgiving and have a camping/caving related question for the electronics gurus in the group. Sue has a

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread George D. Nincehelser
I'm on the road so I can't give a detailed answer, but Resmed has an online guide for battery sizing. http://www.resmed.com/us/assets/documents/service_support/battery_guide/198103_battery-guide_glo_eng.pdf Let me know if you need more help and I'll look closer when I hit a motel. I'm

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread Mark Minton
Geary, Since the amperage is the same (2.5) for both 110 v and 12 v, my guess is the machine is running on 12v and has an internal transformer to cut down mains voltage. That being the case, it would be rather inefficient to use an inverter to raise 12 v to 110 only to cut it back

RE: [Texascavers] electronic question - help requested

2012-11-18 Thread Edward Gelsone
and layouts until I settled on my large array. Check eBay for whatever you feel you need. Ed From: Geary Schindel [mailto:gschin...@edwardsaquifer.org] Sent: Sunday, November 18, 2012 10:38 AM To: texascavers@texascavers.com Subject: [Texascavers] electronic question - help requested Folks

[Texascavers] electronic question - help requested

2012-11-18 Thread Geary Schindel
Folks, Sue and I are heading out camping this Thanksgiving and have a camping/caving related question for the electronics gurus in the group. Sue has a sleep apnea machine she uses. We've used a marine battery that has worked for as long as a week without charging. I checked the amp hour

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread Logan McNatt
Death Valley for Thanksgiving? Does that mean you'll be having turkey vulture for dinner? On 11/18/2012 10:37 AM, Geary Schindel wrote: Folks, Sue and I are heading out camping this Thanksgiving and have a camping/caving related question for the electronics gurus in the group. Sue has a

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread George D. Nincehelser
I'm on the road so I can't give a detailed answer, but Resmed has an online guide for battery sizing. http://www.resmed.com/us/assets/documents/service_support/battery_guide/198103_battery-guide_glo_eng.pdf Let me know if you need more help and I'll look closer when I hit a motel. I'm

Re: [Texascavers] electronic question - help requested

2012-11-18 Thread Mark Minton
Geary, Since the amperage is the same (2.5) for both 110 v and 12 v, my guess is the machine is running on 12v and has an internal transformer to cut down mains voltage. That being the case, it would be rather inefficient to use an inverter to raise 12 v to 110 only to cut it back

RE: [Texascavers] electronic question - help requested

2012-11-18 Thread Edward Gelsone
and layouts until I settled on my large array. Check eBay for whatever you feel you need. Ed From: Geary Schindel [mailto:gschin...@edwardsaquifer.org] Sent: Sunday, November 18, 2012 10:38 AM To: texascavers@texascavers.com Subject: [Texascavers] electronic question - help requested Folks