Hi Arby,
That seems like a good starting place. I am running an 8kWh lithium pack in my 10,200 lb ketch and I rarely get down to 50% of my usable capacity (I use 80% of rated capacity for my usable capacity) during my typical day sails and weekends of coastal cruising. To get the same range from other battery types at 4kts, I would need 11kWh of AGM or 13kWh of flooded cells. So averaged out, that's pretty close to 1 Wh per lb like you suggest.
Of course, special use cases would require different size banks. But I think that typical recreation sailboaters will do fine with your rule.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Arby Bernt <arbybernt@...> wrote:
>
> We have a nice rule of thumb for power, about 1kw per ton of displacement.
> I'd like to propose a battery standard.
> How does 1wH per pound of displacement work?
> Our test boat, a 7000lb Ericson 27 has 9600wH, and is never worked. A 13000lb Rawson 30 I converted has 12kwH of power, and it gets worked.
> Other Systems..?
>
> Arby Bernt
> Advanced Marine Electric Propulsion.
>
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (62) |
No comments:
Post a Comment