[Public-List] Re electric power.

[rmglover1]

Is anyone using the Finnish solar panels in the sail system for recharge?

Mark

Sent from my iPhone

> On Apr 23, 2020, at 12:31 PM, Kris Coward via Public-List <public-list at lists.alberg30.org> wrote:
> 
> 
> 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
>> 
>> On Thu, Apr 23, 2020, 12:45 AM , <public-list-request at lists.alberg30.org>
>> wrote:
>> 
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> -- 
> Kris Coward                    http://unripe.melon.org/
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