Hi Steve,
Running a 20' monohull "all day" at six knots using four FLA GC batteries (probably 220Ah max) is astonishing.
You have perhaps 5kWh of energy on board, and pushing a boat like this to that speed could easily take 2.5kW, meaning that if you ran the bank down to full discharge, you'd be likely to have a bit more than two hours run time. Actually, less, since the Peukert Effect hasn't been factored in.
Do you have "Watts per knot" data to share? I'd be particularly interested to know power consumption at 4, 5, and 6 knots. You can see the performance of my launch at: http://www.grapeviewpointboatworks.com/chart.html
-Tom
---In electricboats@yahoogroups.com, <electricboats@yahoogroups.com> wrote:
I have a Duffy 20 named Sparky, posted pics in folder named "Sparky". Ours is unique in that its an outboard drive unit. I use the Torqueedo 2.0 cruise. Boat is unbelievably quiet, we operate on 4 6v deep cycle batteries from Costco. We can cruise all day at 6 knots. I'm charging with solar at home might mount the panels on the boat but looking at flexible panels now available on ebay. We'd mount them to the roof. Boat is stored on trailer near home so I use external panels from garage roof. Duffy's are the original electric boat ours was built in the 70's.
Steve
---In electricboats@yahoogroups.com, <matwete@...> wrote:
-----Original Message-----
From: electricboats-owner@yahoogroups.com
[mailto:electricboats-owner@yahoogroups.com] On Behalf Of Dag Hanssen
Sent: Tuesday, September 24, 2013 6:58 AM
To: electricboats-owner@yahoogroups.com
Subject: Duffy....?
Hi from Fort Lauderdale.
I purchased a used Duffy Balboa a few weeks ago, bit it does not run,
working on having the controller tested, should know in a few days.
Has anybody fitted Solar Panels to their Duffys?
If so what size?
What is the current draw from the 48 Volt motor?
I have 8 golf cart batteries and the brochure talks about a 15 hr endurance,
sounds high, would that be with an optional larger bank of say 12 or 16
batteries?
Not much tech info on the Duffy site, looking for help from other owners.
Thanks
Dag
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