Indeed…and thru the charger to the batteries, while there's loss, I've
successfully cruised all day with a HondaEU2000i with 2 chargers plugged in,
delivering a total steady charge current of 40amps into 36v…that'd be
1440watts steady to the batteries—or 1440watts (just shy of 2HP) less drawn
from the battery for cruising with nom ¼ to 1/3 gph fuel consumption. Two
of these would be good for 4HP continuous with ¼ to 1/6 gph fuel usage.
-MT
From: electricboats@
On Behalf Of dennis wolfe
Sent: Tuesday, June 02, 2009 6:10 PM
To: electricboats@
Subject: Re: [Electric Boats] Re: Boats over 30'
The EU200 should drive the battery charger with 110v AC, not the wimpy 12v
output. Then you get 1.6 kw if your charger can handle it.
----- Original Message -----
From: Mark Stafford
To: electricboats@
Sent: Tuesday, June 02, 2009 4:32 PM
Subject: [Electric Boats] Re: Boats over 30'
SailingPM (other names?... I care!),
Mark Stafford here echoing Keith (aweekadaysailor)
credit. Sure start small, get some performance numbers, but plan to at least
add another motor (dual motors driving your one prop shaft). Two 19 peak hp
motors will give you adequate thrust (90% - 99% hull speed) for short term
"situations"
high dual motor thrust, provided you auxiliary cool the motors. Hardly
enough to battle adverse wind and current for transport, but plenty for
short safety maneuvers.
The HondaEU2000i is great, but inadequate since it can only slow charge one
battery at a time. 8 Honda 2000's would be cumbersome, but make you a happy
motor/sailor. Alternatively, a more expensive DC genset would make you an
ecstatic motor/sailor. I am still looking into those for myself (55' x 10'
Herreshoff in Berkeley).
Mark Stafford
--- In electricboats@
<mailto:electricboa
wrote:
>
> I've been reading this board for a few years now and have since gotten my
own boat over 30' and have been waiting for the right time to jump in. I
know nothing of the technical electrical stuff but from what I've read here
and see what's available for sale. I am mechanically able to create my own
set up, but I guess the question always comes back to power, and juice,
which for me is still hard to determine will be enough. Below is my info,
but I still need confirmation that this is suitable and/or reasonable.
Thanks for the great posts. I'm still learning much.
>
> Union Polaris sailboat
> displacement type hull
> 36' on deck
> 32' waterline
> 22,000 lbs
> perkins 4-108 (taken out)
> 100 gal diesel tank (taken out)
>
> The challenge for me is to be able to mosey motor (3 knots?) out of the
Alameda Estuary to the Gate and back on battery power in mild wind and at
slack water. By then the batteries should be down to 80 - 70%? I will have a
honda 2000 generator for anything further and to stop depleting the
batteries. Speed is not so important. But I figure this is the range I'd
like to make me feel comfortable on batteries only at a reasonable pace.
>
> I'm looking at one 48 volt Etek-RT
> 8 - 6 volt trojans for 48 volts
> mounted a la thoosa style with the pulleys and such at 2.3:1.
> My prop is 15", but I don't know pitch. It is in an aperture behind the
rudder.
>
> Is this a reasonable starting point for a setup? I've seen a similar setup
in the photos section in Vallejo.
>
> Thanks for sharing.
>
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