I can testify that 5000 Whrs is grossly inadequate for a 40,000# boat.
My dream is for two of those 20 kWhr Li Ion fork lift batteries packs for $20,000 but budget reality will probably force me to just get another 8 pack of Trojan T-125s for $1000 which will be twice as good as what I have now but still inadequate. I think I would be good with a total of 20 kWhrs of storage though, which is .5 Whr/# in my case. However I get about 25 kWhrs/day from my solar panels which definitely factors into the equation. So if you're operationg strictly off your batteries, 1 Whr/# is probably a good benchmark to shoot for but if you have another energy source such as solar or a genset, I'd say 1 Whr/# is a bit heavy and the .5 Whr/# is a more like it.
That's just my opinion and I would also add that's when it comes to energy storage capacity, more is always better.
Carter
From: Arby Bernt <arbybernt@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Monday, April 15, 2013 2:51 AM
Subject: [Electric Boats] Proper battery capacity
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Monday, April 15, 2013 2:51 AM
Subject: [Electric Boats] Proper battery capacity
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.
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