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Withdrawn Gel AGM LIFETIME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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