Hi hanermo,
You've got a few interesting metrics in your answers.
$100,000 of LiFePO4 batteries would be 200kWh and they would weigh 5000lbs. That's a lot of storage. In AGM that would be 400kWh and about 10,000lbs...
I really enjoyed the 5-7 year quote. It is exactly what all of us EV people were saying in 1995. It never quite materialized. Lithium did recently double the range of lead acid. But it costs at least 50% more for the same range...
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "\"hanermo\" - CNC 6-axis Designs" <gcode.fi@...> wrote:
>
> Lots of Q and some are not conductive to cheap D/E solutions....
>
>
> 2. Battery power
> Expect to use li-ion or AGM batteries. Li-ion are much better, and a lot more expensive. You need to define your energy budget in kWh...
>
> Battery costs for this use will be 20-100.000$, depending on whether you want short or medium range. Assumes 70% hull speed, around 10 kW/h draw, and 2 hours cruise, ie 20 kWh battery capacity. 70% for 45 feet should get you about 7 knots for a cat at 10 kW/h or 14 miles for 20 kWh. (In the ballpark, I think. Just an estimate.)
>
> Within 5-7 years, this issue is likely to go away, as will the huge
> financial penalty of lion batteries.
>
> Expect about triple the range, and 20% less cost and mass, for a given investment in battery today....
>
>
> The Q is very open-ended, as something like this may have a budget from
> 50 k$ (someones hobby) to 500 k$ (medium range, can afford 100k in
> battery and std "marine" rated stuff).
> You needs and budget are going to be the deciding factor.
>
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