T-Pain Is On A Boat: Re: [Electric Boats] Re: Next problem: batteries and others.

Tuesday, April 27, 2010

Re: [Electric Boats] Re: Next problem: batteries and others.

I just throwing figures out as I pretty much understand them to be.

I'm hoping someone who has real numbers will jump in.

In all fairness, when you buy a flooded deep cell you get about 20-30 percent usage before you begin to potentially damage the battery and I think that on high load the flooded cell drops faster than an AGM battery.

When you add the deeper discharge that an AGM battery allows, you've probably cut the cost of each amp into about a third or less.

SO, I think that each 3 amps or so(usable power) from a flooded battery, will equal something like 10 amps from an AGM battery . . . maybe more . . . maybe less.

PLUS if you pull a lot of amps out of a flooded cell, the battery will, I think will actually discharge faster than the ampreage rate and from what I understand the AGM discharge will be much less.

Given if this is true, an AGM battery will give you much more usable power for a little more than a flooded cell battery.

So to speak a cheaper AGM battery(less amps) might actually out-perform a more costly flooded cell with much higher amps. AFTER all, it's only the amps you can really make use of that mean anything.

John Francis

Pearson 26

Port Clinton

On Tue, Apr 27, 2010 at 11:56 AM, Eric <ewdysar@yahoo.com> wrote:

Victor,

In my opinion, the biggest advantage that AGM batteries have over flooded cells is that they will deliver more energy from the same rating under high amp loads. Look up Peukert Effect for a detailed decsription of the issue. IMHO, this attribute alone makes AGM batteries a better buy than flooded cells.

I have made multiple posts that show the differences between three major battery types with the math done to show the available duration (range). Since your boat is fairly heavy, you will see higher loads than most of the people here and the Peukert effect will probably play a larger role in your effective range.

Fair winds,
Eric
Marina del Rey, CA

--- In electricboats@yahoogroups.com, "vjmtymo" <vjmtymo@...> wrote:
>
> I've finally found a good source for drive pulleys, bearings and so on so thanks to all the advice here on this site....

> What would be the real advantage of AGM's aside from the obvious of little gassing and maintenance, mounting? Prices - ouch! Never liked that little detail about them....

> Again, appreciate the help.
>
> Victor
>

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