GBB Shunt#

GBB Shunt is a GbbOptimizer module designed for installations with lead-acid batteries (flooded, gel, AGM).

What is GBB Shunt?#

In installations with lead-acid batteries, the standard SOC measurement by the inverter can be inaccurate. GBB Shunt enables more accurate tracking of the battery state of charge based on current measurement through a shunt (coulomb counter).

Key Features#

  • Accurate SOC measurement — based on current measurement (coulomb counting), not voltage
  • Temperature compensation — accounts for the effect of temperature on lead-acid battery capacity
  • Battery protection — prevents deep discharges that shorten the life of lead-acid batteries

When to Use?#

GBB Shunt is recommended if:

  • You use lead-acid batteries (not lithium)
  • The inverter does not have accurate SOC measurement for lead-acid batteries
  • You want to extend battery life through precise cycle control

Lithium batteries (LiFePO4, Li-ion) with BMS have built-in accurate SOC measurement and do not require the GBB Shunt module.

Configuration#

The GBB Shunt module is configured in the installation settings under the advanced section. It requires:

  • Battery capacity (Ah)
  • Nominal voltage
  • Shunt parameters
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