Thank you.
I will check out the items you point to and understand what you are saying.
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???
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
>
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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