Gamatronic Electronic Industries Ltd.
Power+ Technical Guide
39
3.9
F.A.Q. (FREQUENTLY ASKED QUESTIONS)
3.9.1 BATTERIES
3.9.1.1 Q:
W
HAT IS THE
DC
VOLTAGE OF THE SYSTEM
?
H
OW MANY BATTERIES ARE
NEEDED
?
A: The nominal DC voltage of the system is
±
424v to
±
432. Power Plus units operate with positive and
negative voltage independently. There are 64 batteries in series in each battery bank, with a middle
connection point which has additional wire connected, so there are two groups
–
positive and negative,
32 batteries in each. The DC voltage is measured between the center point and one of the poles. The
middle point is interconnected with the input neutral. If the DC voltage is measured between the positive
side and the negative side, it will be in range of 848v to 864v DC.
3.9.1.2 Q:
W
HY SHOULD THE BATTERY CAPACITY BE ENTERED IN THE SYSTEM
CONTROLLER
?
A. The battery capacity has to be entered for the calculation of the battery test duration. Power Plus units
offer smart battery handling, and one of the features is a smart battery test. It uses the relevant
information to provide the best information about the current battery status. This information includes
global battery Ah rating, current load level, battery current (if available) and some calculations.
3.9.1.3 Q:
W
HAT WILL HAPPEN IF THE BATTERY CAPACITY WAS NOT SETUP
CORRECTLY
?
A. Accurate values of Ah battery capacity should be entered; otherwise the reliability of the smart battery
test will be lower.
3.9.1.4 Q:
W
HY DOES MY BATTERY TEST LAST FOR MORE THEN
1
MINUTE
?
A. Battery test can last for a number of minutes, it is not a problem. For a unit with large batteries and low
load, checking the battery condition in the best way will take more then one minute. Power Plus units
have smart battery test feature implemented, which discharges the batteries by 5% of the capacity during
the test to check them in the best way.
3.9.1.5 Q:
W
HAT IS THE MAXIMUM CHARGING CURRENT FOR THE BATTERIES
?
A. Under full load each module can provide 2 A to charge the batteries. In case that a module is not
loaded, the entire rectifier current (12 A) can be passed to the batteries. Another example, if one module
is loaded at 50% on the output it can provide around 7 A to the batteries. This means that in Gamatronic
systems with on-line battery topology all current that doesn
’
t go to inverter is available for battery
charging.
3.9.1.6 Q:
S
HOULD THE BATTERY CURRENT LIMIT FEATURE BE ACTIVATED
?
A. The battery current limit is an optional feature. Before enabling it please make sure that you have this
option in the system. In order to check it, please see the rear side of the controller. There are three
battery current sensors connections there, in a green plug. If nothing is connected there, then this option
is not available in your system and must be disabled.
