[Public-List] Re electric power.

[Kris Coward]

Yeah, the next time I'm speccing out a battery bank for an electric
motor, I'm pretty sure I'll go with lithium. When I was making the
decision this time around, I was assuming that a burning lithium ion
battery would be a metal fire (class D), and damn near impossible to
extinguish.  Since installing my current lead-acid bank, I've learned
that lithium battery fires are generally safe to treat as class A or C.

And yeah, LiFePO has something like 3x the capacity for the same weight,
in addition to being able to put out its full rated current pretty much
right down to complete discharge -- that's like a 20x improvement in
range the the motor's running at full tilt.

While I've already pretty much figured out that I like to stick to about
3kts on the electric, and can get to a harbour without wind from pretty
much anywhere in Lake Ontario at that speed, on the batteries I've got,
I'm pretty sure I'd have to switch to LiFePO in order to get to
Smugglers Cove under power.

-K

On Thu, Apr 23, 2020 at 12:23:24PM -0400, Margaret and Richard Mair via Public-List wrote:
> We have been running electric since 2012. Can't tell you the prop rpm. We
> run a 13×12 3 blade prop with 3:1 gearing.
> I can tell you that 5 knots will be pulling 95 amps at 48 volts. At 3 knots
> only 20 amps at 48 volts. Electric is great but to get range you need to
> slow down.
> Not sure if you know this but a 200 amp hour agm pack will only give you
> about 20 minutes pulling 100 amps out of it due to pucket effect. Lithium
> is rated differently and would actually give you 2 hours for the same rated
> pack.
> I know this is not a direct answer to your question but just to give you an
> idea what is possible.
> 
> 
> Richard & Margaret
> Into The Blue
> 
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-- 
Kris Coward					http://unripe.melon.org/
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