Wanco Metro Variable Message Sign - Table 6-1 Battery Charge Requirements

Owner’s Manual 43
Wanco® Metro™ Message Sign
Table 6-1. Battery charge requirements
Charge
level,%
Open-circuit voltage,
volts
Approx. required charge time,
hrs.
6V batt. 12V batt. 5A 10A 20A
100 6.37 12.73 0 0 0
95 6.34 12.68 3 1 1
90 6.31 12.62 5 2 1
85 6.28 12.56 8 4 2
80 6.25 12.50 10 5 3
75 6.22 12.44 13 6 3
70 6.19 12.37 16 8 4
65 6.16 12.31 18 9 4
60 6.12 12.24 21 10 5
55 6.09 12.17 23 12 6
50 6.05 12.10 26 13 6
45 6.37 12.03 28 14 7
40 6.34 11.96 31 16 8
35 5.95 11.89 34 17 8
30 5.91 11.81 36 18 9
25 5.87 11.74 39 19 10
20 5.83 11.66 41 21 10
15 5.79 11.59 44 22 11
10 5.75 11.51 47 23 12
5 — — ———
0 — — ———
Notes
1. Determine the battery charge level from the voltage test readings.
2. If charge level is above 70%, no charging is required. If charge level is below 10%, the
battery may need replacing. Otherwise, determine the approximate required charge time
from the table.