Joined: 02 Nov 2003 Posts: 17001 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Posted: Mon Jul 16, 2018 4:41 pm Post subject:
Well, Foggy, we do agree on that many will do fine with just a volt meter. But even in the 80's I had gone over to a digital volt meter, and managed a 1200 amp hour battery banks for about 100,000 ocean miles over 8 years, with just the digital volt meter. On the other hand, you are measuring the amps in and out with the Watt Wizard, so you do have modern technology, and are not a Luddite.
I find advancing technology one of the interesting challenges of boating. Currently, I am trying a liFePO4 battery of usable 110 amp hours, weight 29#, (and a fraction of the size of an 8D or two group 31's), for the Freezers/refrigerators, and with the Li battery technology the old "volt meter" is no longer valid. Victron Energy recommends a Peukert's exponent of 1.05 rather than the accepted 1.25 for lead acid batteries. I suspect that lead acid batteries (including AGM) will be a thing of the past in a few years. _________________ Bob Austin
Thataway (Ex Seaweed) 2007 25 C Dory May 2018
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
Home port: Pensacola FL
Joined: 01 Aug 2013 Posts: 1093 City/Region: Traverse City; Northern Lake Michigan
State or Province: MI
C-Dory Year: 2014
C-Dory Model: 26 Venture
Photos: W B Nod
Posted: Wed Jul 18, 2018 7:07 am Post subject:
that away wrote:
SNIP To charge the engine battery from the solar system, you need only to parallel the two battery banks, This gives you one bank of 5 group 31 AGM batteries. SNIP
Seems simple, direct, a complete great answer to the post. Is it?
With 3 battery switches (start, parallel, house) does the above hold true regardless
of the ON/OFF status of the start and house bank switches? Then there are
ignition switches to consider...
Grandpa used to say, "The more you know, the more you learn there is to know."
Grandma used to say, "Most of us don't know what we don't know." _________________ It's difficult to win an argument with a smart person and almost impossible to win an argument with a dumb one. So, why do it?
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