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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > need a way to recharge battery while sailing
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Thread: need a way to recharge battery while sailing Reply to Thread
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Topic Review (Newest First)
09-23-2011 07:14 PM
hellosailor carl-
As the HF manual for that product says:
"7. This product is not water-proof, so keep out of the rain."

It is intended to be kept on the dashboard of a car, not water-resistant at all. You might want to try adding some silicone seal to improve your odds.
09-23-2011 05:41 PM
carl762
Quote:
Anyway, was just thinking of how/where to mount the tiny solar panel (stern rail obviously, but then when/how)?
I mounted my Harbor Freight 5 watt panel on the stern rail (zip ties for now) and ran the cabling through starboard Dorade vent back to the battery. I'll fashion a better mounting solution this Winter, but it works just fine for now.

I changed out all the bulbs on the boat with LEDs, and have LED running lights. All that's left is replacing the masthead light with an LED version.

There's no shore power at my current marina, and I've had no problems with power.
09-20-2011 10:54 AM
SHNOOL I am curious what you go with... I have a Capri 22, and as I understand it, the small solar (5w) is enough to top off the battery, but that is about it.

I have a 6HP with alternator, and I know it would not charge the battery when it was dead flat (daughter likes to see lights on in the cabin apparently during the day)... Anyway, was just thinking of how/where to mount the tiny solar panel (stern rail obviously, but then when/how)?

I really don't run the motor enough to charge anything.

Yes I like the idea of LED's everywhere, so I'll be looking into that for one of my MANY winter projects.
09-05-2011 03:09 AM
75R20 You have many options presented here. LED's are expensive. A bigger battery is probably a good choice regardless of what else you run. AGM batteries have a longer/better reserve rating. Outboards....Several problems here; Your basic 9+ hp outboard "may" charge the battery, but will move a J24 at hull speed at idle, and at idle, will not put out enough to charge the battery and could wiegh upwards of 90lbs. and also require a seperate fuel tank, and the storage for it. Most J24 owners that I know don't want the weight aft, so they remove the motor for racing, and I garantee you will not want to lift a 9+hp motor on and off the back of your boat. I run a 4hp with charging circuit(6 amps), with an on-board tank, and it does charge the battery because you do rev it enough for full output, it wieghs 55lbs. Still not light, but I need the motor to get the boat out and in to the morrage.
My choice for you : bigger battery with solar for back-up.
Best of luck
Kary
S/V Mariah
#49080
08-24-2011 02:12 PM
hellosailor folly, in theory the battery will swamp out (absorb) any excess voltage from the panel unless your battery is fully charged, the panels are really huge, the sun bright, and the load small.

In practice a panel may put out 17-22V when it is rated "12" volts and there's a lot of electronics that will blow out at 15 volts, so if you're on a budget you disconnect the panels. Or, use a multimeter and make sure you can't blow anything, i.e. that under the "best" worse case, you never see more than 14.4 volts on the "12" volt supply lines to the electronics.
08-24-2011 01:59 PM
follysurf I have a similar situation....

Is it Ok to leave the solar charger connected directly to the battery while using electronics?

I have read in several places where they say to disconnect panel while using battery.

Thanks
08-10-2011 12:43 PM
MacGyverRI I use a 125 watt wind generator from here affordable wind turbines made in the USA and it was only $110 along w/ 2 sets of 45 watt solar panels. One 45 watt set from Harbor Freight and they're on sale for $149 this week.

Total was only about $400
08-08-2011 10:43 AM
bandaidmd As others have mentioned swapping to LED bulbs in your existing light fixtures ~interior and exterior~ cuts you amperage use by 90%. A small solar panel like they make to lay on your cars dash will put back most of what you use between times when your able to hook up to a real charger.
07-22-2011 05:08 PM
hellosailor Adam, if it is just the running lights consider replacing them with LED running lights and an LED anchor light. They cut your power consumption so much that despite the high price (of good ones) they can be the cheapest way to make your battery bigger.

Then throw on a small solar panel (that is warranteed for exterior use in the rain!) so the battery will stay topped up when the boat is not in use. And maybe a GFI, a long extension cord and cheap charger as "trip insurance" you can use at docks.

Odds are if you switch to LED lighting and the battery is any good to start with, you'll be OK.
07-22-2011 03:36 PM
pdqaltair
Quote:
Originally Posted by Adam9066 View Post
to be honest im not sure of the battery size im going to have to get back to you on that has a 6 hp evinrude outboard. but pretty much just run the lights and stuff no more then a 2-3 night trip. it would simply be running the lights i don't think any thing else. pretty much most of the overnights will be to an island to go camping but i want to be able to have power on the boat just becuase well you never know.

did you tie the two batteries in parallel or just swapped them out?

like i said worst case scenario i bring my generator and set it up on the dock and use a charger. i was just hoping for something a little more convenient becuase i have seen all these things about water generators and wind ones
What Rozz said!

We had only one group 24 for the first 5 years, and that worked OK, but as I added lights, electronics and started watching movies (portable DVD) it came up short. A lot depends on how you use power. An anchor light can be your biggest use, because of the hours.

I installed a small 10amp charger in the boat:
Amazon.com: Guest 2611A Charge Pro Series Marine Battery Charger (12/24-Volt, 10-Amps 5/5, Double Output): Sports & Outdoors)
Which allowed me to recharge easily at marinas and at the dock. Really easy, and probably a good first step.

I don't think a solar panel set-up makes sense on that boat. It didn't make sense on my Stiletto. Keep it simple, light, and fast.
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