tpbrady
Guru
Back in June our 4 8D AGM house bank gave up after 8.5 seasons. Since the only way to get batteries into the boxes is to tilt them, I couldn't go with flooded batteries so that left me with either 6V or 12V AGMs or the Firefly Group 31 carbon foam. The least expensive non flooded route was 6V AGM's. However if you factored in the useable amp hours, they were only a $.01 less per usable AH based on 80% DOD for the Firefly's and 50% for the AGMs. Without going into a long story here is what I am seeing from the bank of 6 Firefly's (696AH total) over the last week:
The first column is the amps consumed as measured by a Link 2000. The second column is the percent remaining capacity on the Balmar Smart Gauge. The third column is the amps used based on remaining capacity predicted by the Smart Gauge (.2*696=139.2). 4th column is amps consumed per battery. 5th column is the number of hours, 6th column is average amps consumed per hour, and the last column is the average amps consumed per hour for each battery.
162 80% 139.2 27.0 17 9.5 1.6
149 86% 97.44 24.8 16 9.3 1.6
96 91% 62.64 16.0 10 9.6 1.6
117 85% 104.4 19.5 10.3 11.4 1.9
107 93% 48.72 17.8 11.5 9.3 1.6
What I don't understand is why the large discrepancy between the Smart Gauge and the amps consumed by the Link 2000 (all grounds are tied to the a shunt). In only one case are they close, 117 consumed versus a predicted 104. Any ideas out there?
Tom
The first column is the amps consumed as measured by a Link 2000. The second column is the percent remaining capacity on the Balmar Smart Gauge. The third column is the amps used based on remaining capacity predicted by the Smart Gauge (.2*696=139.2). 4th column is amps consumed per battery. 5th column is the number of hours, 6th column is average amps consumed per hour, and the last column is the average amps consumed per hour for each battery.
162 80% 139.2 27.0 17 9.5 1.6
149 86% 97.44 24.8 16 9.3 1.6
96 91% 62.64 16.0 10 9.6 1.6
117 85% 104.4 19.5 10.3 11.4 1.9
107 93% 48.72 17.8 11.5 9.3 1.6
What I don't understand is why the large discrepancy between the Smart Gauge and the amps consumed by the Link 2000 (all grounds are tied to the a shunt). In only one case are they close, 117 consumed versus a predicted 104. Any ideas out there?
Tom