Personally, I like the idea of a gauge with range to 100% depletion. Knowing the ultimate range is a safety issue for me. I'm sure there is a % of discharge reading on the monitor which you can use for prudent battery management. In a critical situation, Knowing I will make the next harbor (or not) at current speed/amp draw sounds like good information to me.
Mark
Santa Cruz
--- In electricboats@yahoogroups.com, Richard Mair <fullkeel2000@...> wrote:
>
> Eric
>
> I can tell you that when I ordered they asked what type and size of batteries so they could program the system to match..
> Richard
>
>
>
> ________________________________
> From: Eric <ewdysar@...>
> To: electricboats@yahoogroups.com
> Sent: Thursday, June 30, 2011 9:18:55 PM
> Subject: [Electric Boats] Re: New numbers - I would love your input - I will upload the excell file next
>
>
> Â
> Hi Richard,
>
> From a vendors standpoint, that makes sense. Since different battery types have different usage guidelines, it's tougher to make it "one size fits all". Many people here use the guidelines of 60% DoD for FLA, 70% DoD for AGM and 80% for Lithium. Many mainstream boaters use a 50% limit for their deep cycle FLA house batteries. Of course, using a 100% limit doesn't give one much of a reserve....
>
> I would be interested if the range and hours figures are tailored for battery type, your numbers worked out to a Peukert's exponent of 1.10, which is a typical figure for AGM batteries. Flooded cells can vary more widely and typically fall into the 1.2 to 1.3 range. I use 1.25 as a reasonable average for flooded cell performance calculations.
>
> My E-Xpert Pro HV allows for a battery's Peukert exponent to be entered into the meter to make it's capacity predictions more accurate. My Lithium batteries were spec'd with a PE of 1.03 and that figure is proving to be fairly accurate through observation.
>
> Fair winds,
> Eric
>
> --- In electricboats@yahoogroups.com, Richard Mair <fullkeel2000@> wrote:
> >
> >
> >
> > Hi Eric.Brett
> >  I e-mailed Scott at Electric Yacht.He confirmed that the readings are to 100% discharge..He did not want to presume what depth customers would use..
> > Richard
> >
> >
>
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