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Go Back   SailNet Community > Out There > Cruising & Liveaboard Forum > Living Aboard > Please help me with batteries...
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Thread: Please help me with batteries... Reply to Thread
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Topic Review (Newest First)
07-15-2006 01:14 AM
camaraderie toastchee...I assume your CPAP machine is AC powered. I further assume you are looking to power it at anchor rather than at the dock right?
To use it onboard you'll need an inverter to make your DC batteries back into AC. First thing you need to do is find out how many AMPS your CPAP draws at 120V or how many watts...then we can help you with what size inverter you'll need AND whether your battery setup can handle it. What size/type amp hour battery did you get? If the CPAP uses straight AC then my guess is you can't do it off a single small battery...but if it plugs into the wall with a little "brick" DC adapter then you may be able to do it. More info needed!
07-14-2006 05:37 PM
PBzeer Use this link http://www.livingaboard.com/cgi-bin/...c;f=1;t=000528 for info on CPAP boat usage.
07-14-2006 02:29 PM
Nathan West I have a friend with a CPAP and while he doesn't sail he does camping (Camp site camping not backpacking) and he uses a 12V adapter for his CPAP and a battery jumper pack- check Kragen Auto- lasts him all weekend
07-13-2006 06:05 AM
infonote You can try a combination of solar and wind energy to charge your batteries
07-13-2006 12:27 AM
sailingdog What is a CPAP snoring machine???
07-12-2006 11:27 PM
toastchee Thanks guys, I now have a marine batt and deep cycle charger. I can build from there. Ideally I'd like to power my CPAP snoring machine overnight on the boat. Any other sailors have one of those?
07-12-2006 06:44 PM
Valdare
You can buy a deep cycle Optima battery 34 series that are smaller than most 27 series. The AMG Optima can actually be installed upside down side ways and are water proof.

I have seen rv trailers that when plugged into the car via the lighting plugs also has a charger, charging up the extra rv battery.

There are many ways to accomplish your simple needs with out going overboard. The solar charger really works well, we use one on a boat hoist to keep the boat battery charged and the hoist battery charged using a simple cig. lighter adapter.

Good Luck,

John
06-27-2006 02:58 PM
sailandoar
Add a battery to your car...

Mount an extra battrery in your car or truck... perhaps in the trunk, and then just take it out and use it when needed. A switch is needed to be sure you don't short out the leads when the extra battery is disconnected.

A '24' series is a nice size to carry and will run lights etc for a weekend camping/sail if your frugal. The '27' series battery is portable but you can get a strain or a hernia pretty quickly with one. Two '24' series deep cycle would be more juice and easier to move around than a '27' series.
06-27-2006 02:40 PM
sailingdog I think the solar panel charger is a good one. It should top off your batteries while the boat is just sitting at the dock. If the panel is small enough, then you can just wire it directly to the battery, and won't need a charge controller.

However, you're really much better off sizing the battery according to the loads you're going to put on the battery.
06-27-2006 12:59 PM
hellosailor Toastchee, you might want to do a little work online looking at marine or RV batteries and charging systems, or pick up a classic little book called "The 12v Doctor" or "The 12v Bible" from many boating stores.

Any battery that is small enough for you to conveniently lift and carry from your boat to your car, won't have a lot of power. "Lot" being a relative thing, maybe it wil be enough for you. And a battery in a car is literally a bomb, if it isn't bolted down and you are in an accident, it becomes a 40-pound missile filled with caustic acid. You car's charging system is also not designed to recharge it, unless you start modifying you'll just ruin it, and your car battery.

So...if you start over, by figuring out how much power you need and for how long, then you can start designing a whole system. Or, just buy a deep cycle/trolling battery at WalMart along with a charger for it, and see if that works for you.
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