T-Pain Is On A Boat: Re: [Electric Boats] Electric Scooter Batteries??

Thursday, July 11, 2019

Re: [Electric Boats] Electric Scooter Batteries??

By the way....

I was thinking of the prop on the Torqeedo 2R and 4R. Those props are BIG, and specifically engineered for electric boat motors - not gas engines.

Is the prop on the Torqeedo 1003 similar, in that it would be much bigger than what would be on any other cheap small gas outboard?

On Thursday, July 11, 2019, 04:28:28 PM CDT, oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

1) It would still be an interesting test, even with a beat up Torqeedo prop - if the Torqeedo is still significantly more powerful, that says something.

2) Can you "jumper into" the battery connection on your Torqeedo 1003 - or is it set up so that you can't use an outside battery?

There might be proprietary stuff built in so that you can only use a Torqeedo battery (dunno). But if not, it would see easy to power that motor off almost anything else.

The nice thing about the electric bike batteries is that it's a small form factor that is already built up to 48V.

I have a Torqeedo 4R mounted on a small outboard runabout. The reason why I was asking about the max output current from the e-bike battery was that I was wondering if I could at least test this configuration. I couldn't go far, or very fast - but the Torqeedo 4R will spin the prop and move the boat (slowly, but at least moves along - about 3mph) at about 300W (6A@48V). At 600W (12.5A@48V), I should be close to 4mph.

If an 18AH e-bike battery can really deliver 18A for 1 hour without bursting into flames, this would give me something to play with - and then I could add a 2nd, 3rd, 4th... as $$ allows, for more range.

However, if the e-bike battery is limited to only 2.5A discharge rate, that's only 120W, and not very helpful.

Someone mentioned voltage sag.

The Torqeedo does have a low voltage cut-out. If the e-bike battery voltage drops too far, the motor will cut off - which would also be unhelpful.

I'm curious about how the batteries would perform. Not sure if I'm $300-600 curious. Though it's a hell of a lot cheaper than a $1000-2000 Li battery, even if that would most likely work well.

John

On Thursday, July 11, 2019, 03:58:15 PM CDT, 'james@deny.org' james@deny.org [electricboats] <electricboats@yahoogroups.com> wrote:

I am some what curious about side by side comparison myself. At $500 dollars maybe I'll just buy one and compare it to my Travel 1003. Though to be fare I would need to replace my Torqeedo's prop first, it is pretty beat up for a fair contest. At a $100 bucks for a new prop, I have just been living with the slight out of balance vibration for around six months.

I have been considering buying a spare Torqeedo 1003 battery pack anyways, to have more range. But the cheapest quote I have found is $500 bucks without shipping. So I could buy this motor and a larger battery for about the same price.

Hmmmm.

On Jul 11, 2019, at 10:46 AM, oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

I took a look at "electric bike batteries" on Amazon.
Plenty of 48V Li batteries listed, with chargers, in about the $300 range.

My question is concerning the rating of the batteries (as VERY LITTLE documentation is provided - as is so typical of so many products imported these days...).

The listings give a rating of something like: 48V (56V nom?) at 18AH
But in the further specs, the mention 2-2.5A output...

How fast can you discharge the battery? Can you draw 18A (864W) for one hour, or do you need to limit the draw to 2.5A (120W) max?

John

On Wednesday, July 10, 2019, 12:39:13 AM CDT, Berlouin Fred berlouin@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

I have a Lithium battery 15amps at 48v. It is very common for electric scooter and bicycle on the market.

On Tuesday, July 9, 2019, 02:44:06 PM GMT+12, 'james@deny.org' james@deny.org [electricboats] <electricboats@yahoogroups.com> wrote:

What batteries pack did you pair with the Hangkai?

On Jul 8, 2019, at 4:41 AM, Berlouin Fred berlouin@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

As requested, a little update about the 4HP Hangkai 48v outboard.

I have it for a year, it works very well. It makes my life easier and nicer…. No service, no maintenance, no repair….as simple than this!!