Schneider Electric Owner's Guide

Boost Charging
C–2 975-0560-01-01 G
Using Boost Charging
Boost charging allows for better utilization of flooded lead acid batteries under
moderate cycling in off-grid applications. Boost charging encourages a short
duration charging voltage—above the gassing voltage—at the beginning of the
absorption charge state. Testing has shown that boost charging improves battery
performance by providing a regular mixing of the liquid electrolyte. Boost
charging specifically discourages capacity-robbing acid stratification and plate
sulfation.
Boost mode charging can be enabled by selecting the custom battery type and
then setting the bulk voltage higher than the absorption voltage. The multi-stage
charge algorithm then attempts to use the higher bulk voltage for the first hour of
the absorption stage – unless interrupted by the max absorption timer or exit
current threshold mechanism.
1. Boost charging encourages gassing of flooded lead acid batteries.
2. Boost charging is NOT recommended for AGM, GEL, or any other
electrolyte-limited and/or valve regulated sealed battery application.
3. Boost charging could result in higher than normal water consumption.
However, the benefits of boost charging are likely to be greater than the extra
watering effort. Check battery water levels at least once per month.
4. Boost charging has maximum benefit when used on batteries that
experience moderate cycling. An unoccupied cottage, for example, where
batteries are full the majority of the time, might not benefit from boost
charging – especially if battery watering is difficult.
WARNING
HAZARD OF EXPLOSION
Boost charging generates explosive gases which might escape from the
battery. Always make sure battery ventilation is adequate.
Failure to follow these instructions can result in death or serious injury.
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