when looking at the details of the 360ibl system they don't specify the power of the motors, same when looking at the specifics of the 180ibl and the 100ibl...
most tend to specify kw not hp which is a better way to go i think.... did you mean that these were 9hp or did you mean 9kw.... i don't see either rating at the moment
they do call out 360A but don't specify if that is continuous or not... i gotta assume that it is 48v but that is also missing from the system specs... wouldn't 48v * 36A be 17.28kw so that these would be two approx 8.6kw motors.... if it is continuous then i'd like to know the over amping capability be it 450 for 1 minute or whatever.... they just don't provide all the info necessary or i would be taking them much more seriously
almost no matter what it would be sort of a crime not to provide an air circulating fan almost like one that you would find in a PC and triggered by a thermostat.... so much protection for so very little power and expense
From: James Sizemore <james@deny.org>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Cc: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Tuesday, September 6, 2011 7:19 PM
Subject: Re: [Electric Boats] Re: hypothetical question...
What you are describing is pretty much the Electric yacht Quietorque 360ibl, two 9hp motors and controllers driving the same belt.
Thank you.
I will check out the items you point to and understand what you are saying.It seems that it would be important to have redundancy built into an electric propulsion system if one were to be out in the wilds so to speak. I wouldn't expect a chandlery or any other equipment supplier to be able to provide parts or expertise needed to adequately deal with repairs to an electric propulsion system. Sometimes diesel repair can be a problem but electrics, no way.Therefore it has occurred to me that instead of, for instance, a 10kw system it would be better to have two 5kw systems that were completely independent of each other. In that way should one motor or one controller breakdown one would at least be able to limp along.My first thought would be to provide perhaps enough power in one motor to reliably provide 70% of hull speed. 70% of hull speed is frequently sited as a VERY power economical way to cruise. When both motors were operational one could attain full hull speed quite handily as long as one was willing to sacrifice a lot of battery/gen capacity in the effort.Hi priced systems may very well be more reliable but, to borrow a concept, a sort of RAID (redundant array of inexpensive drives) approach might be both less expensive and more robust?
Thoughts???
From: Eric <ewdysar@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, September 6, 2011 5:03 PM
Subject: [Electric Boats] Re: hypothetical question...Hi Michael,
I suggest doing a little research on the "White Zombie" an electric drag racer that has been running joined DC motors for quite some time. he has also used twin controllers to get past the 1000A controller limitations that existed for some time.
For boating purposes, I don't think that one needs to use two motors until you get much farther up the power scale. If you need them, 20kW motors aren't that difficult to source.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Michael Mccomb" <mccomb.michael@...> wrote:
>
> if one were to hook two 10kw motors utilizing separate controllers and battery banks together so that the two motors were driving a single load wouldn't any imbalance in contribution of effort by the two systems tend to result in a transfer of power from the over contributing system to the lessor contributing system? secondarily if one could have the controllers differentially contribute amperage based on which battery bank was least charged couldn't the resulting system serve to balance the two battery banks? i would also think that the balancing could be attained in either powering or regeneration modes
>
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