Temperature compensation is a feature of some high quality battery charging devices. It is a setting that allows the charger to adjust the charging voltage of the battery to suit the temperature of the battery. Most battery datasheets specify that the battery charge voltage should be reduced at high temperatures to prolong the battery lifespan.

Correctly setting the temperature compensation of your charger may improve the lifespan of your battery bank. The correct compensation value for your batteries should be available in the battery datasheet or from the battery supplier.

The value you are looking for is something such as -16.20mV/C (Victron Default).