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Subject Topic: Battery Discharge info
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Personblazer666_uk
20/5/2014 at 11:34am
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I have just got hold of a brand new 75Ah car battery.

I am using this for an electric outboard for my inflatable rowing dinghy that I take camping with me.

Am I correct in understanding that the potential duration of a battery is the amp hours if my battery is rated 75ah then this battery could last 1 hour with a 75amp draw? so my motor has a 4amp current demand so it could last for nearly 19 hrs on a single charge (75/4 = 18.75)

I do appreciate the figures are not going to be exact but an approximation is fine.


Post last edited on 20/05/2014 20:50:28

Post last edited on 20/05/2014 20:51:05


PersonGareth29
20/5/2014 at 12:37pm
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A car battery will not withstand many discharges below 80% before its scrap.

A 'propper' leisure battery is only designed to be discharged to 50-60% capacity at the very lowest.


PersonGrampian91
20/5/2014 at 1:07pm
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Dont forget that figure is running the battery totally flat. As the voltage drops the amperage drawn will be increasing. So you wont get 18 hours from it.

As mentioned above though running it that low will seriously shorten its life.


Personsaxo1
20/5/2014 at 2:00pm
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f you run it below 50% it won't last long.
The most I would estimate you should attempt to get would be a max of 8 hours and even then you will find that as the volts drop you will get less power from it as the current will drop.
saxo1


PersonDaveS1
20/5/2014 at 4:55pm
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I wouldn't go far from shore without the oars !!
Daves1


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Personsaxo1
20/5/2014 at 7:44pm
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The difficulty with determining the time it will last is if the 4A is the off load current draw or is that when it is full throttle.
My Minn Kota draws 6A off load but 30A at full throttle, my 110Ah battery will only run it for a max of 2 1/2 hrs at varying loads before the battery is discharged to app 50%, which is as low as you should discharge it.
saxo1


Personblazer666_uk
20/5/2014 at 8:47pm
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Yes that's fine anything over two hrs is a bonus. Its only for pottering around on lakes and rivers. Im going to get a solar charger any one had any experience with these. Was looking at getting a 20w one with a regulator. Would this work with the battery running?


PersonGrampian91
20/5/2014 at 10:01pm
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Thats OK if you can wait a few days to put some charge back.

Dont forget they figures are a full sun one. SO a bit of cloud and that is drastically reduced.

You will be lucky to put 12watts or 1Ah back into the battery..

To charge a battery your looking at 60 watts upwards i think to have a chance to charging it properly.

4amps seems rather low as mentioned. is that on a light throttle?

Just looked at the specs of one for a small canoe and it draws over 8 amps at full throttle.


Personblazer666_uk
20/5/2014 at 10:21pm
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Yes the outboard is tiny. It gives 30 lbs of thrust so lucky if you hit 5kts. Maybe I'll get a 40w solar charger then seen one for 40 quid on eBay.



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