Windy Nation Xantrex C Series Multifunction DC Controller - Manual (Page 98)

Batteries
78 975-0004-01-02 Rev D
CAUTION: Damage to Batteries
Equalization should be done only on vented (not sealed or
maintenance-free) lead-acid, liquid-electrolyte batteries. The
battery manufacturer should be consulted before attempting to
equalize any other battery type. Add clean, distilled water to the
battery following the equalization process.
CAUTION: Damage to Loads
DC loads may need to be disconnected by turning off circuit
breakers or removing fuses before equalization to prevent damage
by the required higher voltages used in the equalization process.
CAUTION
If the batteries are equipped with hydro caps (catalytic gas
recombiner caps), they should be removed during the equalization
process. If hydro caps are used, you should disable automatic
equalization to prevent possible damage.