OPzS and OPzV Batteries

Updated: Jul 7, 2020

In an inverter system, batteries play very important roles. First, they provide the needed DC that will be converted to DC for use in appliances. And second, in off-grid situations, they help store excess electricity generated from solar panels for use at a subsequent time.


While all batteries have essentially the same components, electrolytes, terminals and separators integrated into 'cells', they are often differentiated based on either the nature of their most basic component, their electrolytes, or their plate technology. Based on their plate technology, inverter batteries can either be Flat Plate or Tubular.


Differences Between Tubular and Flat Plate Technologies

The definitive features of the tubular battery are the multi-tube bag gauntlet and increased surface area of the positive plate.

Due to increased positive plate surface area, tubular batteries have 20% more electrical capacity than flat plate batteries of comparable size and weight. With less positive plate shedding, tubular batteries also provide up to a 30% longer service life than flat plate batteries. Generally, tubular batteries are the preferred of the two types of batteries.


Based on the nature of their electrolytes, batteries can either be

  1. Flooded Lead Acid (FLA)

  2. Valve Regulated Lead Acid (VRLA)

A Victron Energy OPzV Battery

Flooded Lead Acid

Flooded lead acid (FLA), is the traditional battery technology. As the name implies, the liquid electrolyte in the battery is in the liquid form. FLA batteries require constant maintenance checks which may be a heck to some people. Also, the increase the risks of spillage, explosions and domestic accidents. Read how to maintain FLA batteries here.