5 Watt Solar Panel & CPAP Machine - Page 2 - SailNet Community
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post #11 of 29 Old 10-14-2011 Thread Starter
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LL:

I do have an extra battery in the garage which exactly matches the one onboard. I'm going to employ a person (my nephew) who is smaller than myself to help me first find a place for it, and then help install it. I can't squeeze into the space myself. But, yup, thought about that.

Darned boat is a never-ending todo list.

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post #12 of 29 Old 10-14-2011
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Exp: High wattage panels complete and ready to rock and roll. You can also get individual 6'' X 6" mono crystalline cells rated at 3.77-4.4W ea for about 0.60USD ea. if you want to build your own panel (s).

High quality lower price SOLAR PANELS 200W and 230w
FOB_Price: US $1.0~1.25
Shandong Huayi Sunlight Solar Energy Industry Co., Ltd.
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post #13 of 29 Old 10-14-2011 Thread Starter
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In fact, reminds me, a fellow sailor gave me a two-battery box a few months ago. Think I'll just pull the existing box, affix the second - that'll work. I hear my nephew is a hard worker, so I don't mind spending money on him to help out old Uncle Carl. Plus the motor charges the battery, so I'll have to figure all that out. Have to study Nigel's book, and Don's Sailboat Electronics. I suck at electronics. More of a woodworker type.

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post #14 of 29 Old 10-14-2011 Thread Starter
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Exp: High wattage panels complete and ready to rock and roll. You can also get individual 6'' X 6" mono crystalline cells rated at 3.77-4.4W ea for about 0.60USD ea. if you want to build your own panel (s).
Cool. Got a link?

In the meantime, WTF, I'm going to use the damned thing on the boat. If I wear the battery down a bit over one night experiment, it'll charge. I have a multimeter down there.

I do want to upgrade the solar though, but not lots of room on a 23 footer for that. There'[s a couple railmount projects from Good Old Boat that I have printed out and should work on this Winter. Thus far, I've been very happy with my setup. I run the lights and usually run the stereo all night when I sleep there.

Only thing missing is heat.

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Last edited by carl762; 10-14-2011 at 04:33 PM.
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post #15 of 29 Old 10-15-2011
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This was just to illustrate how economical solar can be for high output panels that are already built. At $0.60/6"x6" cell with an average output of 4w a guy could get very creative on almost any size vessel that has a battery for a small outlay of cash.
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post #16 of 29 Old 10-15-2011
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A note on power consumption.

I checked my wife's new CPAP more carefully:

5.2 amps at 12V if running full load, including water heater.
2.5 amps at 12V if running only the blower.

This may be the source of some of the confusion. Since it is very damp around most boats, my wife does not use the heat or the humidifier on the boat, only in the house in the winter when the air is very dry.

So, 30 AH is not so bad. Still after a few days, you will need some juice. I would add a second battery before I added solar; less money, complication, and needed if you add solar and other toys anyway (solar is great until it's cloudy, so it is best to have batteries for 2 days anyway). Also consider the size and type of the batteries; 2 group 27 deep cycles have a lot more kick than 2 group 24 starting batteries, and the size difference is minor.

(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")

"Well, I just climb up to them."

by Joe Brown, English rock climber




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post #17 of 29 Old 10-15-2011
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30AHrs each day the machine is used sounds reasonable.
If it is used for an average of 4 days a week 30x4/7=17AHrs allow a bit for battery losses, and led lights etc and that is 20AHrs each day.
Its important to understand no matter how big your battery bank it will go flat if you do not generate 20Ahrs a day, 7 days a week.
A 5w solar panel will produce on average about 1-2Ahr a day.
So you will need to make up an average of 18-19Ahrs each day.
If this is done by running the main engine it will only be for the days you are on board so you will need to run the engine long enough to produce close to 30Ahrs each day you sleep on board.
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post #18 of 29 Old 10-15-2011
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The boat is a Sundance 23 and i believe it has an outboard.

Brian
Living aboard in Victoria Harbour
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post #19 of 29 Old 10-15-2011
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Quote:
Originally Posted by mitiempo View Post
The boat is a Sundance 23 and i believe it has an outboard.
More solar, wind, or shore power needs to be fitted if that is the case. The power must be replaced. or the battery bank will go flat, even if a extra batteries fitted.
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post #20 of 29 Old 10-16-2011
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My wife's resmed autoset II runs on a 150 watt inverter and draws less than 2 amps at 12v. You will need at least a 50 watt panel to keep up with that draw.
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