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5.8 Suitable disconnection device
It is recommended to have a disconnection device for protection between
battery system and inverter:
1) The rated voltage shall be ≥60VDC. DO NOT use an AC breaker.
2) The rated current should match with system design.
The following factors should be considered:
the maximum DC current on inverter side.
the number of power cable: for instance, if there is only one pair of
4 AWG cable, the rated current of breaker shall be 125A or smaller.
3) If using a breaker, it shall be type C (recommended) or type D.
The Icu required:
the maximum short circuit current for calculation of each module is 2500A.
for instance:
Battery qty. Icu of breaker
1~4 modules Must ≥10kA
5~8 modules Must ≥20kA
5.9 Turning on
Double check all the power cables and communication cables between
batteries and between battery and inverter. Switch ON the disconnection
device between battery and inverter if available.
1) Switch on all the battery modules:
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