T-Pain Is On A Boat: Re: [Electric Boats] Re: using a 36 Volt dc motor from a 48 volt pack

The chevy volt pack can be broken up into small packs.
In my case a 48 Volt 45 Ah module or maybe 2 to get 48 Volt 90Ah.

My boat is an older (1979) trihull boat(not the best efficiency)

I had a 75 Hp outboard with a dead motor.

From what I have read here a larger prop is better.
I hope mine isn't to large for the motor.

I currently have a direct connection with a lovejoy connector.
Maybe I should consider a pulley so I can change ratios if I get too much heat.

I think it is a 4 to 1 ratio.

I don't plan on going to fast(4-5 knot) and my range doesn't need to be too much( 2-3 miles).
--------------------------------------------
On Wed, 2/3/16, Bill and Ai Qiu hopen billhopen@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:

Subject: Re: [Electric Boats] Re: using a 36 Volt dc motor from a 48 volt pack
To: electricboats@yahoogroups.com
Received: Wednesday, February 3, 2016, 8:30 PM

wow thats
big power....what are you pushing with that? the size and
pitch of prop/transmission/rpm have to be right to keep
from over-heating on long runs. throw in a temp gauge or
a small fan blowing on the armature/brushes
area
Bill Hopen - www.billhopen.com
Hopen Studio Inc - 227 Main St.,
Sutton WV 26601
304 -765-5611
billhopen@yahoo.com

From: "Mark F
mark.internet@yahoo.ca [electricboats]"
<electricboats@yahoogroups.com>

To:
electricboats@yahoogroups.com
Sent: Wednesday,
February 3, 2016 10:16 PM
Subject: Re: [Electric
Boats] Re: using a 36 Volt dc motor from a 48 volt pack

I have a
48 Volt battery module from a chevy volt, I plan on charging
it with some solar panels.

I have a 36 Volt Golf cart motor(1960's vintage)
attached to a chrysler 75 Hp outboard motor leg.

I am considering an altrax sepex controller.

My motor is a 36 volt DC sepex motor.

Like you say worst case I fry the motor.

--------------------------------------------

On Wed, 2/3/16, king_of_neworleans
<no_reply@yahoogroups.com> wrote:

Subject: [Electric Boats] Re: using a 36 Volt dc motor from
a 48 volt pack

To: electricboats@yahoogroups.com

Received: Wednesday, February 3, 2016, 5:28 PM

Sure. Overvolting most DC motors by a modest

amount usually won't cause a catastrophic failure,

though it might reduce lifespan of the motor through

degradation of the coil insulation. Not covered, is

overvolting, by warranty. You should have a temp sensor

installed and an overtemp shutdown system. I know my
cheapie

Kelly controller shuts down at a certain temp if I enable
it

and connect a thermistor, which I haven't by the way
but

should. If the motor is not exceeding max operating temp
you

are good to go. Just in case, you might want to have a
spare

motor. No biggie because usually the motor is the
cheapest

component. My controller cost twice what my motor cost.
My

battery bank cost almost 3x what my motor cost. Even my

reduction gear cost more than my motor. So, I have two
of

them. Three, actually, since I bought a 12kw motor to
play

around with. My regular motor is 5kw. Anyway, as long as
you

take proper precautions I don't see a problem. And
with

a spare motor you are set for any uh-oh moments.

BTW, this opinion is

guaranteed to be worth a minimum of what you paid for
it.

IOW, YMMV. But FWIW, I will be doing exactly the same
thing

with my trolling motor powered pirogue, running off a

Chinese 48v PWM controller and 48v lithium e-bike
battery.

The trolling motor is 12v, actually. I don't think
it

will be a problem. If it is, I burn up a $130 trolling
motor

and have to paddle back to the boat. Obviously I will not
be

running it at full available power from the controller,
but

it should work okay.

Is

your motor brushed, or brushless?

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