Is distilled water right for every inverter battery?
No. Add water only to a serviceable flooded lead-acid battery when its manufacturer’s instructions call for it. An inverter may be paired with different battery types, and the fact that a battery is connected to an inverter does not tell you whether it can be watered. Read the battery label and manual before opening anything.
Trojan guidance says to use distilled or deionized water for its flooded batteries, never acid. Add water after a full charge; if plates are exposed before charging, add only enough water to cover them, then charge and top up afterward as the battery manual directs. The correct fill level depends on the battery’s design, so use the marks and instructions for the exact battery. Do not fill to the cap or overfill it: electrolyte can overflow during charging.
Which batteries should not be watered?
Do not open or add water to sealed AGM, gel, or lithium batteries. If the battery’s chemistry or service instructions are unclear, stop and ask the battery or inverter supplier to identify the correct procedure. Do not use a general watering rule in place of the product manual.
Follow the battery maker’s charging guidance
The battery maker manual determines fill levels and timing. Use a charger with the correct program for the battery type, and follow its instructions. Keep charging in a well-ventilated area with ignition sources kept away as directed by applicable safety guidance.
If a battery is leaking, unusually hot, damaged, or otherwise abnormal, do not continue maintenance as though it were routine. Follow the manufacturer’s safety instructions and contact qualified service personnel.
Related: Compare inverter battery options, review home inverter battery considerations, and learn about lead-acid battery types.
