Circuit Breaker and Shunt Trip. Why

We recommend the use of a Circuit Breaker and Shunt Trip as bestto protect the batteries.  Both are needed as we trigger the shunt trip that manually trips the circuit breaker. 

The below is an example that is generally available worldwide and suitable for a 48V system but there are many possibilities.  Specific choices of circuit breakers and responsibility for the choice is yours and should be made to suit your individual circumstances.  As rules and product availability vary from country to country and even state to state within some countries you should consult with someone qualified locally to you for a recommendation of what will suit your circumstances.   We only sell circuit breakers to customers within Australia 

What it does is disconnect the battery pack to prevent:

  • Over charging
  • Over discharge

Control Logic

  • the first level of control is the remote logic.  This is only in place with a connected inverter or charger.  It uses overall pack voltage.  These are the narrowest limits.
  • The second level of control is using the charging and discharging control logic.  This aims to pick up issues such as if a cell was high or low but overall pack voltage is still within limits.  It would stop charging or go into Limited mode so that cell isn't overcharged or depleted.  Expansion settings allow you to trigger a contactor or similar if you don't have a CANbus connection to gain this control level.  These limits are a bit wider than the remote settings  but narrower than critical settings.
  • The circuit breaker is the last level.  It uses Critical settings.  These are the widest limits when you need to just cut the charging or load if the narrower limits haven't worked.  

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