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Old 05 December 2015, 09:54   #1
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Charging battery from outboard

I've got a 2010 Tohatsu MFS 20C 4 stroke outboard engine.
It's a basic pull start model.
I would like to charge my battery from the engine.
Just wondering, does anyone know what's required mechanically and the rough cost involved.
Ultimately is it worth the hassle or do I buy another battery as back up.
Cheers
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Old 05 December 2015, 10:17   #2
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Quote:
Originally Posted by kaman View Post
I've got a 2010 Tohatsu MFS 20C 4 stroke outboard engine.
It's a basic pull start model.
I would like to charge my battery from the engine.
Just wondering, does anyone know what's required mechanically and the rough cost involved.
Ultimately is it worth the hassle or do I buy another battery as back up.
Cheers
As said Kaman your engine has an alternator all you need is a charging kit which will be a rectifier/regulator wiring loom (fused) takes about 20 mins to fit you just need a twin cable to the battery then put a volt meter in circuit so you can see the voltage across the battery whilst engine stood also you will see it rise when you start the engine so as you drift for long periods and you get low voltage warning on the plotter just start her up on tick over or go trolling, best option really other than that a larger battery deep cycle same as caravan batteries slow release over longer periods. Cost wise you would be looking at 120 tops Suzuki prices tohatsu I would say a bit cheaper, changing the battery would be not far off same cost I would think. the bueaty is if you can charge the battery any length of holiday sorted.

Cheers
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Old 05 December 2015, 19:59   #3
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Kaman - what Jeff says. You should already have an alternator but its probably unrectified (AC only) on the pull start model. You therefore need a rectifier/regulator. The official part is probably 100-150 ish and simple to fit. If you can be bothered with some reasearch, ingenuity fitting it etc, then probably a motorbike part can be made to do the same job for less than 1/5th of the price!
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Old 06 December 2015, 12:44   #4
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If you try hard enough you will find a bike regulator for under 5 and a solar charge controller to regulate the volts for similar. If it costs more than 15 including wires you just aren't trying hard enough...
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Old 06 December 2015, 13:33   #5
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I'm liking the sounds of fitting a cheap motorbike rectifier to have free electricity on tap in my Sib.
You will need to pardon my ignorance guys but ain't got a clue how to go about wiring it in and how to ascertain if it's compatible?
I will tackle most jobs DIY but don't know nowt about electric circuits.
Had a look thru my engine manual but no further forward.
What am I looking for under the cowl and where do I go from there.
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Old 06 December 2015, 13:55   #6
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Not knocking the motor bike stuff and if you know what your doing spot on but in your case Kaman with limited knowledge you would first be better pricing the correct bits to see if in budget if it is you'll be sorted in a couple of days if not try the bike route but you need to be sure.i went Suzuki for ease and warranty the rectifiers are quite large including the heat sink needing a bespoke bracket and the correct connectors if like mine it will have alternator connections ready to couple to might be difficult to match to. OMO

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Old 06 December 2015, 14:18   #7
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Oh rest assured if the harness is cheap that's the way to go.

But if its not then you've got probably 2 wires (maybe 3) from the alternator to connect via a fuse to a rectifier and then to a regulator and in to the battery & supply.

I don't know the engine. So someone who does can hopefully point right direction there. Beyond that I'm sure the rib.net improvement committee can draw a wiring diagram on a beer mat for you to follow...

My only debate would be do you rectify on the engine like the harness would or feed AC from the engine and rectify near the battery where you may have space /freedom in an enclosure to do as you wish...
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Old 08 December 2015, 10:03   #8
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I made some enquiries with Clyde Outboards regarding my electrical dilemma.
Guy I spoke to was brand new and completely honest with me when I described my needs.
He turned down the opportunity to sell me an outboard charging kit to allow me to charge my battery in my Sib from the outboard.

He said it was not the best option for my needs.
Instead he recommended utilising my current batteries and purchasing an XS power pack to recharge my plotter, hand held VHF and run my fish finder over my away days.

They XS pack cost around 100 squid and I can think of other applications I could use them in - small compact and even capable of jump starting a large 4x4. It comes with a host of leads etc and it can fit in your pocket.

Apparently they are quickly becoming must have items amongst the boating / camping community in and around Loch Lomond.

http://m.ebay.co.uk/itm/Land-Rover-M...701?nav=SEARCH[/QUOTE]
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Old 08 December 2015, 12:00   #9
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Says it all, new and doesn't know and by all accounts not interested in finding out, not looked at the charger in detail but won't that be charging with something that wants charging?
I bet if you phone tohatsu uk with all info from your engine they will give you part numbers and cost.then just buy and fit no more probs but your choice.

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Old 08 December 2015, 12:19   #10
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Jeff, think you might be misunderstanding Kaman's way of using describing the salesman as 'brand new' ! 😃

Clyde Outboards only give good honest experienced advice based on info rcvd from customer. I suspect the turning down of a potential sales was based on honesty rather than laziness.

As you say, it's Kaman's choice if he feels it'd work better for him all round.
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