Battery Amp/hour for a kayak electric outboard

[Liquor Box]

I have been looking for a new battery for my yak and spoke to Battery World- I am no electric expert so am unsure what i really need!

I was quoted $169 for a car size deep cycle 55 amp/hour 12V battery- Is this big enough? I know quite a few guys use a 130amp/hour but this is for their boats, and my yak weighs a lot less.

If someone could suggest the correct amp/hour for me it would be much appreciated.

Thanks

[Feral]

Rough rule of thumb - pounds force from your motor equals how many amps it draws on full power (its a little less, but I did say rough!)

So if you have a 25 or 28 pounds thrust motor, you would get roughly 2 hours on full throttle with that size battery before it was flat.

[Liquor Box]

would the light weight of the kayak make a difference?

The kayak is only around 30kg?

Thanks for the help, i have a 42lb so it wont last long, although i dont think i will ever \"red line\" it!

[Feral]

The weight will make a big difference, because as you say will probably only rarely have it flat out.

I remember Lee saying that set on '1' his was still going to fast to troll effectively, he was switching it on and off to get the right speed. I reckon you would get a few hours trolling out of that size battery, then paddle home.

[rayke1938]

Do you have a suitable charger? You need a 3 stage one to get the most life out of your battery or else look at replacing the battery every year.

Ray.