Well said Dave. IMO any energy is good energy as long it does not require you to open your wallet to get it. My concern with regen in my set up is the -4 amps that needs to be overcome before regen starts. I'm pretty sure it is just a controller programming issue. As I have seen other ASMO systems that do not do not have anywhere near the same current draw. It's not critical that I remedy this but, at some point I will. Nice thing about electric propulsion whenever you get bored there is always something you can tweak to see if you can make it better. Whether it be prop, controller, pully ratios etc... Or you can just be content and go sailing as I tend to do. Then when I read here that someone reports back that they have made some progress in such matters it gets me motivated to take another look at it. Capt. Mike
--- On Wed, 12/1/10, Dave Kellogg <inganear1@yahoo.com> wrote:
From: Dave Kellogg <inganear1@yahoo.com>
Subject: Re: [Electric Boats] Re: more regen conversation
To: electricboats@yahoogroups.com
Date: Wednesday, December 1, 2010, 9:10 PM
Regen has always been a controversial subject here on this forum and will continue depending on which position you take.. I personally can't give you exact percentages on what would be acceptable for all of us, it depends on what we need in our own application. We work with trade offs in each case and as we all experiment within our own budgets and expertise we will find the groove we can accept.. and the tradeoff's we can live with, so, we keep plodding along and sharing what we learn, that's what is the most exciting about this group.. Dave K
From: Eric <ewdysar@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Wed, December 1, 2010 3:03:43 PM
Subject: [Electric Boats] Re: more regen conversation
Myles, your numbers look good. I have noticed that most prop manufacturers use a 50-55% "slip" factor in determining the proper pitch for displacement auxilliary sailboats, so your 65-70% prop efficiency may be a bit optimistic for many of our conversions.
One problem in tuning a prop to maximize regen will decrease it's drive efficiency. Since I'm personally more interested in drive efficiency to maximize my powered range, then I'm will to accept less regen. You have clearly demonstrated why regen is limited due to the different water and prop speeds, so adding 20% to regen efficiency could make a small difference, but if came at the cost of 20% drive efficiency, it looks like a losing proposition to me. Others may think differently...
Fair winds,
Eric
Marina del Rey, CA
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