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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 07-22-2011
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need a way to recharge battery while sailing

I just bought a j24 for my self to start racing although i have been boating for years this is my first sailboat. my father owns a few. I bought it primarily for day cruises and racing but once and a while id like to take it on a trip around the lake and what not.

i was wondering if any one made a small wind generator or something like that. if i cant i was thinking about just bringing a small mini gas generator that i have.
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Old 07-22-2011
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cheapo 5watt panel from eBay works for me to keep my battery group 24DP up to snuff.
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Old 07-22-2011
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most outboards around 10 hp are able to charge the battery and have electric start.
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Old 07-22-2011
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Please start by telling us how much electricity you tyhink you will use (multiply watts x hours). Also, how many engine hours per day (a 9.9 hp outboard typically charges 100 watts at full rpm, much less at lower rpm).

Also how much battery do you have (AH rating). Many small boats simply run on batteries overnight. If you are really talking about just a few overnights, a second battery and a modest 110v charger may be the best deal. I did that for many years on a Stiletto 27 (2 x group 24 batteries, 2 people), with trips up to 500 miles. We would plug in at a marina every 2-4 days. Simple boats take little power.

A short example:Sail Delmarva: Short Summer’s Cruise

Typically low outboard hours and rpm won't do much, and a 5w pannel will maintain but not charge a battery.
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Last edited by pdqaltair; 07-22-2011 at 01:50 PM.
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Old 07-22-2011
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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
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Old 07-22-2011
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a single deep cycle should work just fine. try it out. u dont have anything dependant, just convenient(u dont run all lights all night) if 2 and yes tie them together. more then enough power for a few nights of what u said plus radio
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Old 07-22-2011
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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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Old 07-22-2011
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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.
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Old 08-08-2011
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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.
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Old 08-10-2011
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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
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