48V 30Ah batteries for a 2Kw motor

[adventri]

Hi,

I'm starting to look at electric outboard for my small sailing trimaran and am testing a couple currently.

They range from around 1Kw motors to 2.8Kw peak.

Most of the time I would only need probably 500w (10 ish amps) but on occasion I might need peak 2.8Kw for short bursts when in heavy chop in strong wind for example.

Therefore I would need batteries that could cope with 60 amps.

I'm wondering whether there might be any off the shelf bike batteries out there that I could use but don't know where to start looking.

I need to get an understanding of how many amp hours I would likely need - 30 is a finger in the air - if I had 2 x 10's initially I could run one until it dies to see how it goes.

The idea of bike batteries appeals as the cage clip would work equally on my small boat.

I will probably end up making my own I guess but if anyone has any thoughts on off the shelf I would be really grateful.

Or if anyone knows anyone who builds bespoke batteries that I could contact.

Many thanks in advance!

 

[peter.c]

First question how many hours /mins do you expect to run ?and is it motor power most of the time, because unlike a e-bike with pedal human assist this will run on a throttle all the time drive is required so you can expect less range

 

[peter.c]

This might be a second use option for electric car battery ,they seem to replace whole packs
might be a head ache to pass the marine engineers inspection

 

[adventri]

thanks for the quick replies.
The motor is only normally used for a few minutes when launching to get off the beach and into wind while raising the sails then turned off and lifted out of the water.
Then when coming back in to shore, head into wind take down sails and land.
15-20 mins each way at low power probably 500w max.
The rest is just in case the wind completely dies or we get in the ****.
Also thinking about how I could potentially use the outboard to regen power back into hte battery while I'm under sail but that is much further down the road/sea....