Steps to Top-Up Water in Inverter Battery – Dos and Don’ts


Like fuel is to engines, distilled water is to inverter batteries. In this article, we will discuss the importance of distilled water, how and when to replenish it, and the various steps involved in filling distilled water in an inverter battery.

As we know, the basics are always a good place to start.

What is Distilled Water?

When it comes to inverter batteries, we often hear the term distilled water. So, what is the difference between ordinary water and distilled water?  

Distilled water is nothing but the purest form of water. It’s so pure that it doesn’t even contain ions that regular water does. Due to this nature, the distilled water has many uses, including replenishing inverter batteries, car batteries, applications in medicine, etc.

Why Use Distilled Water for Inverter Batteries?

Regular water has ions in it. If you use regular drinking water for your batteries, the ions will clog the electrodes, form a layer, and inhibit the chemical reactions that produce the current. If the water contains organic compounds or dust particles, the chemical reactions that produce energy in the batteries will be hampered. So, only use distilled water to ensure the smooth functioning of the batteries.

Also Read: Things You Need for Your Grid-Tied Solar Plus Battery Back-Up System

Steps Involved in Filling Distilled Water in the Inverter Battery: 

With the above image’s help and the steps mentioned below, you will quickly learn to fill distilled water for your inverter battery.

Step 1: Check the level of distilled water in the battery with the aid of the water level indications. These water level indicators specify the amount of distilled water that is present in the inverter battery. While the lower level has a red mark, the upper level has a green mark. 

Step 2: If the water level is low, as indicated by the red mark, it is time to fill water. But, before you start, make sure that you turn off the inverter and the power socket switch. We wouldn’t want any mishaps occurring.

Step 3: Then, remove the water topping vent plugs by twisting it in an anticlockwise direction.

Step 4: Once you have removed the vent plug, place a funnel in the hole (you can model a make-shift funnel using the top half of a pet bottle) and slowly fill the distilled water into the chamber.

Step 5: Continue this process for all the chambers. You can measure the level of water filled by placing the vent plus back in the hole and fill it up till it reaches the green mark.

Step 6: Once that is done, place the vent plug back and twist it in the clockwise direction to close the chamber. Repeat this process in the same manner for all the chambers. 

Step 7: Finally, clean or wipe the battery, the vent plugs, and the water level indicators with a clean cloth.

Once you have finished filling distilled water in the battery, you can turn the power back on. 

Top-up Water in Inverter Battery

To help you further, below is a list of dos and don’ts you need to be wary of if you own an inverter battery.


  • Use only distilled water for your inverter battery.
  • Check the level of distilled water in your Battery every month.
  • Wear gloves while filling distilled water in the battery.
  • Have a Smartphone reminder at regular intervals that provide you notifications about the water levels.


  • Overfill or under fill distilled water in the inverter battery.
  • Allow the water to leak out of the chambers.
  • Use RO water or any other filtered water as a replacement for distilled water.

So, to wrap up, you can comfortably enjoy the benefits of having an inverter at home. No longer do you have to worry about power cuts and sleepless nights as inverter batteries will come to your rescue.