Inverters have become an essential household appliance to secure an uninterrupted power supply during electrical outages. To store energy effectively, these systems rely on batteries that contain an electrolyte solution composed of sulfuric acid and distilled water. Maintaining the balance of this solution is critical for the battery to hold its charge and function properly over time.
Water Evaporation and Its Impact on Battery Plates
During the routine charging and discharging cycles of an inverter battery, the internal water gradually undergoes hydrolysis and evaporates as steam. As the fluid level declines, the lead plates inside the battery risk exposure to air, which can cause severe degradation. Keeping the liquid at an optimal level prevents the lead plates from deteriorating, preserves charging capacity, extends backup duration, and ensures the battery remains operational for years without premature failure.
The Risks of Using Regular Tap or RO Water
Inverter batteries strictly require distilled water to operate efficiently. Filling them with ordinary tap water, filtered water, or RO water leads to significant damage. Everyday water sources contain dissolved minerals such as iron and calcium. When introduced into the battery, these minerals precipitate and form deposits on the lead plates, hindering the chemical reactions necessary for power storage and permanently damaging the unit.
How to Prepare Distilled Water at Home
Distilled water can be prepared at home using standard kitchen items, including a large pot, a small glass or steel bowl, a lid, and ice cubes.
- Fill the large pot with water and place the glass or steel bowl inside so that it floats in the center without sinking.
- Cover the pot with the lid placed upside down and turn on the stove to heat the water.
- Place ice cubes on top of the inverted lid so that the rising steam condenses upon contact with the cold surface and drips directly into the floating bowl.
- The condensed liquid collected in the bowl is pure distilled water, which should be allowed to cool completely before being added to the battery.
Checking Fluid Levels with Floating Indicator Caps
The fluid level inside a battery can be monitored through the built-in floating caps. Each cap contains a plastic indicator stick that floats on top of the liquid. When the stick remains in an elevated position, the water level is sufficient and requires no immediate replenishment. Conversely, if the stick drops down into the cap, it signals that the water has depleted and must be refilled. Generally, the water level should be inspected and topped up every 2 to 3 months.
