Hi Chris,
Just the internal fan on the ME0913. After 45 minutes at around 6000W of current (a load that is only available while tied to the dock), the temp appears to have stabilized right around 100C (it stopped climbing around 30 minutes). I don't know about longer than that, by then my battery bank was down to less than 20% remaining of my usable capacity and I was ready to recharge. I think that ambient air temp was around 75-80 deg F. although I did not make a note of it at the time.
Eric
--- In electricboats@yahoogroups.com, Chris Hudson <clh5_98@...> wrote:
>
> Eric,
> Do you have an external fan, or is that with the motor's internal fan?
>
> Chris
>
> Sent from my iPhone
>
> On Jun 26, 2013, at 10:20, "Eric" <ewdysar@...> wrote:
>
> > Hi Orest,
> >
> > Propusion Marine has two solutions for water cooling....
> >
> > You'll notice that James rates his systems more conservatively than the motor manufacturer does, he has observed that most drive systems installed in the bilge of a boat do not dissapate heat as well as the same motor on a test bench. So his ratings are based on observed performance, getting temperature readings from sensors installed in the motor windings while in use in a boat. His drive systems will not overheat when run continuously in a boat at rated capacity. I don't know if the other drive system vendors have collected this type of objective data from actual conversions.
> >
> > I personally know that my air-cooled 5.5kW rated system will not exceed 100C while consuming a full 6kW of power deep in the bilge of my boat, the manufacturer of the motor says that the windings must be kept under 150C.
> >
> > Fair winds,
> > Eric
> > 1964 Bermuda 30 ketch, 5.5kW Propulsion Marine drive, 8kW Lithium batteries
> > Marina del Rey, CA
> >
> >
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