T-Pain Is On A Boat: Re: [Electric Boats] LIFEpo4 house bank

Tuesday, July 21, 2009

Re: [Electric Boats] LIFEpo4 house bank

Right on Denis,
I agree wholeheartedly with Denis re Murphy's Law being a major factor here.. A commercial use electric boat could use the better battery's more cycles as does a commercial trucker buying diesel rather than gas. The average driver of a Ford F150 would need to drive in excess of 25000 miles per year to pay back the extra cost of diesel. Same with boats. Need is roughly 1000 hrs per year to pay for diesel over gas in 5 years use.
Gas generator 3000 watt continuous is $400 ex China and Diesel about $6000. I will run my bilge blower and vent well.
My electric boat uses a set of batteries 6 of 12 volt every 5-7 years. Not bad with lead acid.
Dave

I wonder if the cost per discharge cycle is really relevant in recreational boating? Concorde Lifeline AGM has a predicted life of 500 cycles @ 80% as compared to the Mastervolts 2000 cycles BUT 500 boat rides (2 per week for 4 mths) in most peoples' summer weather would be on the order of 15 years. Seems like Murphy would conspire to kill the batteries by some other method when given 15 years to work on it ;

Opinions?

Denny Wolfe

----- Original Message -----

From: Dave Hackett

To: electricboats@ yahoogroups. com

Sent: Tuesday, July 21, 2009 8:32 AM

Subject: RE: [Electric Boats] LIFEpo4 house bank

Hi Chris,

Check out Mastervolt's new LI battery.

http://www.mastervo lt.com/view_ product.php? lang=2&section= marine&prggr_ id=10

19&prg_id=1187& pro_id=6103

They claim 3x the life span of lead. It also has all the battery management

stuff built in so it should be really simple to use.

I'm betting though, this will be a very expensive battery. Does anyone have

any experience with these yet? How about a price? With 3 times the life

span and more usable energy per charge, the higher expense may work out.

DaveH

-----Original Message-----

From: electricboats@ yahoogroups. com [mailto:electricboats@ yahoogroups. com]

On Behalf Of Chris Witzgall

Sent: Monday, July 20, 2009 11:55 AM

To: electricboats@ yahoogroups. com

Subject: [Electric Boats] LIFEpo4 house bank

Hi all;

Does anyone on the group know enough about LIFEPO4 cells to comment on their

suitability to replace traditional house batteries on boats? The two

characteristics I am concerned about are lifespan in years, ie how long will

they last in years if properly maintained, and the ability to withstand

being partially discharged. If on a cruise, a house bank may be charged up

to 100% only occasionally. Maybe the bank is drawn slowly towards 80%

discharge over a week, and then charged up when motoring. Could they be

stored for a long time at 50%, for instance?

Chris

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