For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Do outboard motors charge batteries? Thread starter Blake Hearn Start date Apr 13, Blake Hearn Seaman Apprentice. Joined Feb 14, Messages This is probably a dumb question but i was wondering if my 18HP Evinrude outboard will charge the battery while it is hooked to the motor.
Joined May 7, Messages Re: Do outboard motors charge batteries? My Nissan does. If it is electric start and has some kind of alternator, it should. Joined Apr 15, Messages 5, Some older electric start OMC motors had alternators, some did not. Look for the rectifier on the motor it typically will have a couple of yellow leads and one or two of another color coming into it and is usually on the top, rear of the block and is normally a watercooled device recessed into the block.
Any BRP dealer could tell you after a quick look. The two 18HP models shown on BRP's parts site don't show any sign of charging equipment for those motors, so I would say most likely no charging for you.
Joined Feb 20, Messages Blake Hearn said:. Click to expand I tried it and wasted a lot of effort on it. You need a rectifier box as the supply from the outboard is AC, unless you have a box in the lead fitted inside the engine cover? Unlikely - but you may. The box can be bought from any outboard service agent. He'll gladly relieve you of a sum of dosh! Consider that outboard power is similar to a motorbikes supply to lights It will likely fall off quickly as battery comes up as well giving less than satisfactory level of voltage final.
As other says Joined 16 May Messages 7, I used to have a Yamaha 8B which charged the battery via a rectifier. If your frugal with lights it will keep you charged up but I found it couldnt keep up with the demand from Autohelm and lights together. You definitely need a rectifier between the motors output and the battery as the output is AC.
I have had small boats powered by outboards for a long time. It is worthwhile but you do need to be very frugal with the battery power. Although you dont get as much output as from an inboards alternator the plus side is you dont waste any of what you do get starting the engine.
Modern outboards are much better in output. The latest one 12 amps. On our current 25 ft boat the outboard is the only means of charging the battery and does keep it topped up. Joined 31 Oct Messages 2, Location N. It had to be revving its bits off to generate even an amp of charging current much faster than was useful for pushing a 22' boat along , and it was never running for long enough, anyway.
Had this permanently connected to the battery on a flying lead fused at the battery end. Just left it on the cockpit seat when we were away from the boat and when we went sailing, it went into a cockpit locker.
Hopefully that bloke-with-the-aussie-hat-that-does-the-boat-jumbles will be at Beaulieu at the weekend then! I remember his name is Tom.
Joined 2 Jul Messages 3, I had a Yamaha 8hp outboard about It would put out 5A at cruising revs. Not a lot but useful. I also had an 80w solar panel so had to turn the outboard charging off when the battery was full. Reasons:- 1. The output from small outboards is so minute as to be almost useless. You have to fit a rectifier, to convert the ac from the outboard into DC for the battery, together with a diode to prevent the battery being discharged by the OB when not working.
In themselves not particularly expensive. It's unlikely you'll need a regulator, most OBs won't produce enough current to damage a battery. Pretty much all outboards that have an electric start will re-charge the battery as it runs. How often should you charge boat battery? How do you start a dead boat battery?
Can you charge a marine battery? If the battery is clean and free of corrosion, you can start the charging process. The first step is to connect the battery charger to the terminals of the marine battery. How long does it take to charge a dead boat battery? Batteries usually take several hours to recharge; if the battery is severely discharged What size marine battery do I need?
Most manufacturers recommend charging them to at least Standard marine battery chargers routinely reach higher voltages, so chargers designed to include gel batteries or those with a gel setting must be used. How long does marine battery hold charge?
What is the difference between a rectifier and voltage regulator? See the chart to the right to do the math. How many volts should a boat alternator put out?
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