Ray, If we were comparing the T-105 to the Trojan L-16 in a single string, I agree the T-105 will provide more life cycles. Been there, done that. But that was not the comparison. Having 6-8 parallel strings of golf cart batteries is a terrible idea no matter how much better the GC2 may be.
Larry On Sep 16, 2011, at 10:01 AM, Ray Walters wrote: > The real point is that the Xantrex guy is correct from a scientific stance. > Experimental battery cycle life data shows that some golf cart batteries > (T105) do have more rated cycles to 80%DOD than the Trojan L16. (750 vs about > 600) A really crappy golf cart battery (some have cycle life below 400 > cycles) isn't as good as an L16, yes. You have to base your decision, and > your mouth, on test data for the batteries considered. Also, you must always > compare at 80% DOD, for an apples to apples comparison. Its usually a clue if > a manu doesn't publish their cycle life data. Of course you must temper the > golf cart vs L16 decision with good paralleling technique. > We use golf cart batteries (never more than 4 strings), jump straight to the > HUPs for larger banks, and skip the L16s all together. They just don't make > sense when you look at the cost/ amp hr vs their lifespan. > The only time I could see using L16s, was if the battery bank requirements > were beyond 4 strings of golf cart batteries, and the customer just could not > afford the HUPs, or were going to sell the property soon, and wouldn't > appreciate their long term value. > I've spent a lot of time looking at cycle life data, comparing costs, adding > in maintenance and replacement labor, etc.. > L16s are serious losers on a $/ kwh operating cost comparison, so this is a > chance to up sell the customer to HUPs (or equivalent) and make both of you > happier in the long run. > > Ray Walters > > > > > On 9/16/2011 10:15 AM, Larry Crutcher, Starlight Solar wrote: >> >> Hi Ron, >> Have a look back a few months ago to the discussion about multiple battery >> strings. My synopsis: large, parallel banks are not good; fewer strings are >> always better. How large a bank are we talking about here? >> >> Scientist?? That sounds kind of like “Yea, I been a ‘lectrician for XX >> years...”, something I have heard hundreds of times. It’s just pride saying >> “Look, I can pee that far too!” when in reality they are clueless about DC >> power systems. I’m ranting but my point is you should convince your customer >> that a hands-on, real world experienced professional has a much broader >> understanding of RE system intricacies than a “scientist”. >> >> Larry >> >> From: Ron Young >> Sent: Thursday, September 15, 2011 5:11 PM >> To: RE-wrenches >> Subject: Re: [RE-wrenches] battery cycle life, US Battery >> >> Hi Larry, >> Client has asked me to compare the cycle life because he is upgrading a >> large battery bank and has been convinced by a Xantrex "scientist" that golf >> cart batteries are superior to L-16's even though it involves twice as many >> batteries, connections, cells, footprint etc. So to convince his purchasing >> committee he wants to know the difference in cycle life between a U.S.B 208 >> and a Surrette S-460. >> >> Ron >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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