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Old 06-09-2017, 03:07 PM
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Question Electric outboard motor batteries

For those of you who use electric outboards I'll bet you are as sick as me humping the huge and heavy leisure batteries around. If you are lucky they might last a day, if not you are rowing back to the jetty!

When I get home and put an almost new 70Ah flattened battery on charge, I find it draws a 2-3 amp charging current and is fully charged after only 12 hours charging! That means I have only used about 30Ah during my days fishing so where is the rest of that quoted capacity?

I thought a car jump-starter battery would be handy as a 'get you home' device. It is small and light, and has capacities of 6Ah all the way up to over 80Ah (if you believe the claims from our Chinese friends selling on eBay.)

Then I thought why not put several of these powers packs in parallel, 5 of the 20Ah units would give enough capacity to last all day, It would only weigh about 3 Kg and cost about the same as a large capacity leisure battery! It would probably have a longer life as well. Has anyone tried it? I'm sure it would work if packaged properly and care was taken with charging.

It is an attractive proposition if you compare the price with a good sized Lithium Ion battery of the sort used in racing cars or the price of a spare battery for the 'Torqueedo' electric outboard.

Any comments anyone???
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Old 06-09-2017, 04:57 PM
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Default Re: Electric outboard motor batteries

For your intended use get a battery(s) designed for marine use. Internals are quite different as they are designed to a draw down to close to 'zero' and take a proper re-charge.

Auto bat's are not!
fae
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Old 06-09-2017, 05:03 PM
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Default Re: Electric outboard motor batteries

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Originally Posted by fredaevans View Post
For your intended use get a battery(s) designed for marine use. Internals are quite different as they are designed to a draw down to close to 'zero' and take a proper re-charge.

Auto bat's are not!
fae
Fred - the OP is talking about leisure batteries, not auto batteries.

Col
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Old 06-09-2017, 05:17 PM
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Default Re: Electric outboard motor batteries

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Originally Posted by franticfisherman View Post
For those of you who use electric outboards...
I find there is a huge difference in battery brands. I can get a whole day's hard use out of a Halfords 70 AH, where I would have killed a cheap 110 AH battery such as a "UK Giant" with the same amount of use. I've never flattened a Halfords 110/115 AH in the course of a day, even on a good-sized water like Gladhouse (440 acres) in a stiff breeze, and they last a good 5 or 6 seasons. (I only get about 2 seasons out a Halfords 70 AH though.)

The downside is that the difference is shown when you pick them up - A Halfords 110/115 AH weighs about twice the UK Giant!

You are right though - we need something lighter. I hope lithium ion is the way forward and that prices will come down. Scobo on here has put himself together a cracking set-up using a set of lithium ion packs designed for drones and such like. All the details are in this thread on the same kind of subject.

Don't think anyone here has mentioned the starter pack idea, though I have noticed them and wondered about it.

Col
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Old 06-09-2017, 05:25 PM
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Default Re: Electric outboard motor batteries

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Originally Posted by Cap'n Fishy View Post
Fred - the OP is talking about leisure batteries, not auto batteries.

Col
Hear you Col; here they're called 'Marine Batteries.' Another example of a 'Common People seperated by the same language,' or sum such.

fae

Got that Col; Marine vs. Auto Batt's are a very different design/build. Marine are designed to go through heavy draw downs (to almost zero) and that would distroy a auto battery.

fae
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Old 06-09-2017, 06:17 PM
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Default Re: Electric outboard motor batteries

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Hear you Col; here they're called 'Marine Batteries.' Another example of a 'Common People seperated by the same language,' or sum such.
Indeed. Here, they are also used in caravans, so not restricted to marine use - hence the term 'leisure'. Same deep-cycle batteries though.

Col
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Old 08-09-2017, 10:10 AM
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Default Re: Electric outboard motor batteries

Thanks all, especially the link from Cap'n Fishy, Lipos are interesting but are prone to damage from over-discharging (hence the voltmeter and alarm system.) They also need a balancing system. I think the jump packs are a possibility, the only problem is the price. I just came across a review of them in Auto Express magazine and the quality ones are all over 100! (Draper, Sealy, Energiser etc.) They don't quote the capacity either. I am wary of cheap Chinese copies and their outrageous capacity claims but there's only one way to find out....

Watch this space and I might report success...... or failure...

Cheers

frantic
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Old 10-09-2017, 07:05 AM
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Default Re: Electric outboard motor batteries

Further to this, has anyone built a battery with the Li-ion 18650 cells? They have a capacity of around 3Ah. A group of 3 in series = 11.1 volts, 10 groups in parallel = a 30 Ah battery, simple! At a quid each only 30 plus 10 holders at about 1.50 each = 45. Weight would be about 5 lb. The only tricky bit I can see is charging them - how could you do it without dismantling the whole thing? Could you use a balance board with 10 inputs? Is there such a thing?
I am thinking out loud here because I weighed my Halfords 70Ah leisure battery yesterday and it weighs 39lb (18kg) !!! No wonder I am getting aches and pains
Cheers
frantic
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Old 14-09-2017, 08:16 PM
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Default Re: Electric outboard motor batteries

Chinese specials ?
I have bought at least 50 18650s over the last few yrs for torches and little projects etc. Different type but all offering 3Ah 5Ah etc..

They are not the Ah they say they are. Fine for torches, but I had 6 powering a 12 volt apprx 5amp bilge pump at the end of some piping. It was a portable unit to empty water from boats, and it worked a charm pumping the water up 3 feet through the center of the pipe and out, for 2-3 mins.
When you have those batteries they are light as feathers. Not exactly a sign of high capacity.

Find out where golfers get their caddy cars serviced. Those batteries are 18Ah at a minimum. What happens is they lose power and cant do the full 18 or 36 depending on the battery type. Golfers will buy a new battery and leave the old one at the shop. The shops cant get rid of them, I picked up a dozen a few yrs ago from a local golf course and most are running fine, nearly getting a full season out of the 18Ah one in my boat powering a bilge pump. And a friend of mine put two into a little kids car thing, powering it away fine. So might be worth checking out.
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Old 18-09-2017, 07:01 AM
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Default Re: Electric outboard motor batteries

Thanks for the info Stylie, after a lot of consideration, I have cecided to go the lipo route. I did buy a jump starter pack which was supposed to have 20Ah capacity but when I tested it, it only had 4Ah 😡
I will be sending it back today!
Had some good help off Scobo after looking at his set up pictures 👍
Will report back when I've built my 'Powerbox'
Cheers
frantic
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