Sealed Maintenance-Free Batteries

Updated: Sep 16, 2020

The battery is a major component of the inverter power system. It is from the batteries that the DC is drawn from by the inverter and converted into AC for use in appliances and it is in the batteries that the DC is stored for future use. Batteries are often sold separately from the inverters and have to be bought and installed separately. As batteries contain liquid acid, there are always concerns about safety and constant maintenance. With maintenance-free batteries, these concerns are addressed and eliminated.


Components of Inverter Batteries

Batteries convert chemical energy directly to electrical energy. Its components are constructed in an arrangement that is described as ‘cell’. These components include


Electrolyte. The electrolyte in most wet-cell batteries is sulphuric acid diluted with distilled water. Inverter batteries are mostly wet-cell batteries. The two types of lead-acid batteries that use an acidic electrolyte are wet cell and sealed. Wet cell use liquid electrolyte; sealed batteries use either a gel or liquid electrolyte absorbed into fibreglass matt.


Terminals. The terminals are the pure lead at the negative side and the PbO2 on the positive side both constructed as ‘plates’. With acid electrolyte and lead plates, wet-cell batteries are therefore known as ‘lead-acid’ batteries.


Separators. Separators between the positive and negative plates prevent short-circuit through physical contact, mostly through dendrites but also through shedding of the active material. Most separators are made of rubber. They are more stable in battery acid and provide valuable electrochemical advantages that other materials cannot.



According to their plate technology, a battery can either be Flat Plate or Tubular. Read all about inverter batteries and the differences between flat plate and tubular batteries here.


Tubular batteries have 20% more electrical capacity than flat plate batteries of comparable size and weight. Tubular batteries also provide up to a 30% longer service life than flat plate batteries.