discoverbattery.com
8
7
6 VDC
12 VDC
24 VDC
48 VDC
Bulk & Absorption Charge Voltage U2
7.2V
14.4V
28.8V
57.6V
Recommended Charge Current I1
I1 = Min 10% C20 to Max 25% C20
Float Voltage U3
6.8V
13.5V
27.0V
54.0V
Table 2: Voltage Regulated Charger - Charge settings at 25°C (77°F)
4.1.2 Commissioning Charge
Batteries lose charge while in transit or during storage. For this reason, a refresh charge should be given before putting
the battery into service. Allow the charger to go through a full charge cycle before they are used.
During commission, measure the battery voltage and after commissioning, measure the battery voltage and surface
temperature of each battery and log this data. Discover Commissioning Logs are online available online.
4.2 Discharging
No restriction on the discharge current up to the maximum allowable is required as long as the connections are properly sized and
the battery temperature stays within the allowable limits.
With traditional stationary and renewable energy systems, Depth of Discharge (DOD) is set to operate between 20% and 50% to
maximize the life of the batteries. By default, this may be set by power conversion manufacturer at 1.75 volts per cell (Vpc). Discover
Dry Cell batteries deliver 50% of its rated capacity above 2.05 Vpc, this is also the recommended LVD to optimize battery runtime and
longevity. Preventing batteries to operate at low voltages will increase cycle life expectancy. Standard RE warranty is reduced on
system designs that continuously exceed 50% DoD.
6 VDC
12 VDC
24 VDC
48 VDC
Reference LVD / I10
20% DOD
6.30V
12.60V
25.20V
50.40V
50% DOD
6.15V
12.30V
24.60V
49.20V
Table 3: Reference Low-Voltage-Disconnect / I10
4.3 Temperature Limits
The battery is designed to perform optimally at temperatures between 15-25°C. At lower temperatures the battery capacity is lower
IUU CHARGE PROFILE
BULK
ABSORPTION
FLOAT
8 HRS
14 HRS
NO TIME LIMIT
I1 = 0.25C20 (max)
0.10C20 (min)
U2 = 2.40VPC
(+/-0.015VPC)
U3 = 2.25VPC
Maximum Charge Time (Must be Limited to 24 hrs)
105%-108% recharge
Figure 1: Voltage Regulated Charge profile (IUU charger) at 25°C (77°F)
