Owner's Guide

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.
n Boost charging encourages gassing of flooded lead acid batteries.
WARNING
HAZARD OF EXPLOSION
Always make sure battery ventilation is adequate, according to the manufacturer's
guidelines. Boost charging generates explosive gases which might escape from the
battery.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
n Boost charging is NOT recommended for AGM, GEL, or any other electrolyte-limited
and/or valve regulated sealed battery application.
n 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.
n 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.
Conext MPPT 80 and Conext MPPT 100 Owner’s Guide Boost Charging
86 This document is for use by qualified personnel 990-6214B