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Old 12-21-2014, 03:34 PM   #21
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While we are talking batteries, was wondering if anyone knows if it is possible to put a battery charger on a set (two) of batteries at the same time.
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Old 12-21-2014, 04:38 PM   #22
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Yeah really. Your reply makes it clear that you don't understand what a real battery monitor measures and it has nothing to do with 8Ga wire OR measuring voltage at the battery vs. the monitor.
I can guarantee you that without a true monitor IF YOU BOONDOCK a lot, you are getting significantly less battery life over time by using a Voltmeter. If you don't boondock it doesn't matter.
You get significantly less battery life because:
1. You have no idea when you are 100% charged. Less than 100% charging degrades battery life.
2. You have no idea when you actually go below 50% state of charge.
3. You have no idea of the actual present capacity of your batteries as they age.

There are a number of other things a monitor can tell you that are not directly related to battery life but are helpful....like how many amps does my CPAP draw or how long at my present amp usage do I have before I need to recharge or how many amps is my battery charger putting in RIGHT now.
If you're happy with what you have...fine. Others may wish to have the real ability to save & monitor their batteries in a more proactive way.
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Old 12-21-2014, 04:41 PM   #23
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Originally Posted by tennlady View Post
While we are talking batteries, was wondering if anyone knows if it is possible to put a battery charger on a set (two) of batteries at the same time.
YES. But they should be the same age and type and the charger will work best if it is at least 10% of their combined amp hour rating.
Assuming they are 12V...connect the batteries positive to positive and negativve to negative....then connect the charger to the first battery positive and the second battery negative.
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Old 12-21-2014, 11:33 PM   #24
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We have a Georgetown Motor Home and have been unable to overnight without shore power because my CPAP requires either 110 or a cigarette lighter plug in. Do I have to convert the 110 outlet next to our bed to a 12V then get an inverter to plug the CPAP into?

I only have a 110 cord for my CPAP and very limited 12v cigarette lighter outlets in the camper (like 2 in the middle of the camper in the kitchen). I plugged a cheap inverter into one of my 12v outlets and just ran an extension cord up to the bedroom.

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You do know Cpap are 12 volt and you can buy a 12 plug, that well run them.

The plug from the wall goes to a coverter box the converts 110 to 12 volt. You can save yourself a lot of battery by not running the inverter

I do know that but these 2 overnights were literally the first non-hookups "camping" (well, parking) I've ever done with a camper. If we keep doing it, I'll consider proper alternatives.


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Old 12-23-2014, 12:07 AM   #25
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So...Ependydad... how many 12V amps or 120V amps does your CPAP use...it should be printed in small letters on the wall wart or AC box....that would be helpful to know to advise others how much battery power they need for that device in addition to whatever else they need.
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Old 12-23-2014, 12:48 AM   #26
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I boondock about 8 weeks a year and my monitor does just fine. But I am sure you could tell me how to do it better!

Quote:
Originally Posted by camaraderie View Post
Yeah really. Your reply makes it clear that you don't understand what a real battery monitor measures and it has nothing to do with 8Ga wire OR measuring voltage at the battery vs. the monitor.
I can guarantee you that without a true monitor IF YOU BOONDOCK a lot, you are getting significantly less battery life over time by using a Voltmeter. If you don't boondock it doesn't matter.
You get significantly less battery life because:
1. You have no idea when you are 100% charged. Less than 100% charging degrades battery life.
2. You have no idea when you actually go below 50% state of charge.
3. You have no idea of the actual present capacity of your batteries as they age.

There are a number of other things a monitor can tell you that are not directly related to battery life but are helpful....like how many amps does my CPAP draw or how long at my present amp usage do I have before I need to recharge or how many amps is my battery charger putting in RIGHT now.
If you're happy with what you have...fine. Others may wish to have the real ability to save & monitor their batteries in a more proactive way.
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Old 12-23-2014, 05:37 AM   #27
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Originally Posted by camaraderie View Post
So...Ependydad... how many 12V amps or 120V amps does your CPAP use...it should be printed in small letters on the wall wart or AC box....that would be helpful to know to advise others how much battery power they need for that device in addition to whatever else they need.
My DW's CPAP has 120 volt watts listed. Divide the watts by 12 to get DC amps.
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Old 12-23-2014, 09:30 PM   #28
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Originally Posted by camaraderie View Post
So...Ependydad... how many 12V amps or 120V amps does your CPAP use...it should be printed in small letters on the wall wart or AC box....that would be helpful to know to advise others how much battery power they need for that device in addition to whatever else they need.

I'll look and will report back... if I remember!
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Old 12-23-2014, 10:38 PM   #29
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I've always heard that a triceratops never forgets!
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Old 12-23-2014, 10:50 PM   #30
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I've always heard that a triceratops never forgets!

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Perfect timing, I'm sitting right next to it!

That said, I don't know if those power requirements are with the humidifier or without. The humidifier generally used 3 times the amount of power as the blower only.
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