Anybody ever connected two leisure batteries together to get more running time for the electric outboard ? I think you need to connect in parallel and use similar if not identical batteries ? What cables do you use ?

I can't carry a big 110 or 125 ah so was thinking of using two seperate 75 ah connected in parallel.

Anybody any experience please ??

Thanks........

Rather take a spare fully charged battery, than to have the two connected. You will get more running time like this. Connected together, you will lose charge on them both, at a slightly faster rate than one at a time, due to the loss through the cables, regardless of how thick they are. The only advantage of connecting them together in parrallel, will be the ability to deliver more current, but if the battery is rated to deliver the current the motor requires, there is no advantage to having the two connected.

Hooking batteries in parallel increases the ampere-hour rating of the combined batteries without increasing the voltage. This increases the capacity of the battery and the run time of the device it is powering. Two batteries connected in parallel would power a device approximately twice as long as a single battery.

To increase capacity for 12 volts, connect the batteries in parallel, negative-to-negative and positive-to-positive.
For 24 volt, 36 volt and 48-volt systems, connect in series, positive-to-negative.
Never mix battery capacities, this will cause over charging on one battery and insufficient charge on the other. Connect a 100 amph to a 100 amph. If one battery is significantly older, it can pull a newer battery down because of lead sulphation.

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Rather than two leisure, use one hard working battery.

In all seriousness, think about hooking up your battery to a solar panel like I have been doing for the past 17 years. I can go on a week long trip and not have to take the battery out of the boat to charge up. What a treat this is.

The posts holding the panel up are not permanently fixed. I can assemble and dissemble the setup, within a couple of minutes.

I don't see any advantage in connecting the batteries if the electric is your only outboard. It would involve a lot of faffing around and I can't see that having two batteries in series would give you significant run-time increases. If any increase at all. It'd be easier just to move change the alligator clips over to the second battery when the first runs dead.

The only place I can see this making sense is if you have a petrol outboard with electric start and a generator.

I've seen guys with this setup put their starting battery and their deep cycle battery on an A/B/Both switch. That way the petrol outboard uses the A battery as the starting battery and that's isolated from the B battery which runs the electric motor.

The advantage comes into play in that the switch can be moved to the "both" setting so that the outboards generator can be used to charge both batteries during longer open-water runs. You can put a lot of charge back into a deep cycle battery during a 20-30 minute run, even a small outboard like a 25-40 HP has a pretty hot alternator. You can also use the B battery as a starting battery in case the primary starting battery would die.

But other than that, I can't see any advantage if you're only running a single electric motor.

Grouse

If some of you haven't heard of a solar panel/cells, it is a means of using the natural sunlight to produce electricity. Now what could be better than that?

Is there a reason that most of you people are opposed to using a solar panel? It's like buying your first microwave oven. Once you have it, you have it.

1st you accuse us of being Stupid.
Then you accuse us of not caring for the planet.
When in fact, the simple answer is that most of us HIRE out boats for the session./day.
No Friends,No Wonder.

Jim

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Jimbo, most of you hire out boats? That's nice!