Philip,
I have always been advised that the GEL battery is a great
performer and has greater potential life, but has a couple notable
problems.
They can easily be damaged by too high a voltage, and they do not
tolerate
high heat nearly as well as an AGM.
Finally, you pay a premium cost for them when calculating
the reserve power available and cost per Amp Hour. (with apology for my
not knowing Capitalization Rules <Grin>)
The Absorbed Gas Mat Battery was our choice on Angel Louise.
We seldom dishcharge them much more than 15 per cent,
and the highest discharge to date was to 40% during a several
week anchorage at the Annapolis Boat show.
It makes sense to have a good charging system and accurate measuring
ability to make your batteries last.
Ed
Ed Kelly (& Sue Kelly)
USSV Angel Louise - a Catalac catamaran
Our Skype Phone (202) 657-6357
Email: EdKelly ("at" symbol) netins.net
On Nov 15, 2008, at 10:25 AM, Philip & Marilyn wrote:
At 11:40 AM 11/15/2008, you wrote:
Lee is totally correct.
If you discharge your battery it directly reflects how long it will
last.
The shallower the discharge the longer the battery will last.
Its actually best if you never approach 50 percent
Typical VRLA Battery Cycling Ability
vs. % of typical Depth of Discharge
Typical # of Life Cycles for Battery:
Here We will assume a battery capacity of 100 Ah
Capacity Withdrawn Gel AGM
LIFETIME GEL AGM
100% 450
150 45,000Ah 15,000Ah
80% 600
200 48,000 16,000
50% 1000
370 50,000 18,500
25% 2100
925 52,500 23,125
10% 5700
3100 57,000 31,000
If Edd's figures are correct:
a GEL will give you 27% more power if carefully managed, (10%
discharge) and
a AGM more than double.
a GEL battery will deliver three times as much current over its life
time as an AGM at 100% discharge and
46% more at 10% discharge.
Seems to me that the cost /amp of a AGM is VERY high compared to a GEL
Am I missing something here? or the figures amiss?
Philip
"Be the change you want to see"
Philip & Marilyn Lange
AE4OV & KD4JRC,
ORYOKI
Witness 35 Catamaran
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