Sacred Sun OPzV Series, Technical Manual, Page: 23 / 24

2.3 Annual Maintenance Inspection Items
In addition to the quarterly maintenance items above, inspect the following items:
Item Content Standard Maintenance
1- Discharge test
Disconnect the AC, take
load discharge or
discharge online method
to check that discharge
capacity is minimum
30%-40% of nominal
capacity
At the end of
discharge, battery
voltage should be
more than
1.90V/cell,
differential pressure
must meet the
following values:
2V series 200mV
6V series 350mV
12V series 600mV
If the battery voltage is lower
than a voltage reference value or the
differential pressure is greater than the
reference value, discharge the battery,
then equalizing charge, then change to
float charge and run for 1-2 months. If
reference values still exceeded, contact
our technical team for assistance.
2- Capacity Test
Use on-line or off-line
intelligent discharge
device for discharging
batteries until the end
voltage has reached
1.80V / cell
In back-up use the
capacity to be
maintained must be
more than 80% and
in energy storage
use more than 60%
of the reference
capacity
Recovery test: measure and record
various parameters specified in the
monthly / quarterly maintenance items as
well each battery’s end voltage during the
discharge test. If the battery performance
cannot be recovered, replace and re-cycle
the battery.
3-Measure and
verify the
controller
parameters
1-Measure the limited
charging current values.
2-Check that the
equalizing charge starts
and ends automatically.
3- Verify the automatic
start of battery discharge
protection.
Actual operation
parameters to meet
with the set
parameters
In case power equipment and/or controller
fails, arrange repair in a due course to
ensure correct battery performance and
avoidance of reduced battery lifetime.
Maintenance notes

Operate and store batteries only in an upright position.

Ensure that the battery installation complies with the design requirements and installation
documents.

Please use only insulated tools during operation and maintenance, any metal objects to be
put on top of the battery is strictly prohibited.
Operation and
maintenance
21