---
title: What is a vario chargers
description: "A solar charger from the vario series **is an MPPT charge controller designed to optimise the energy produced by photovoltaic panels and use it to charge batteries efficiently.** MPPT technology continuously adjusts the operation of the photovoltaic generator to extract…"
url: "https://studer-innotec.com/support/faq/vario-mppt-charger-series/overview/what-is-a-vario-chargers/"
updated: "2026-09-15"
category: Overview
tags:
  - solar MPPT
  - vario chargers series
  - variostring chargers
  - variotrack chargers
---

# What is a vario chargers

A solar charger from the vario series **is an MPPT charge controller designed to optimise the energy produced by photovoltaic panels and use it to charge batteries efficiently.** MPPT technology continuously adjusts the operation of the photovoltaic generator to extract the maximum amount of energy, whilst ensuring the battery is charged correctly.

The vario series comprises two ranges:

- **[variotrack](https://studer-innotec.com/vt65/) (vt):** low-voltage solar chargers compatible with 12, 24 or 48 V battery systems.
- **[variostring](https://studer-innotec.com/vs120/) (vs):** high-voltage solar chargers designed for 48 V battery systems, allowing the use of photovoltaic strings of up to 900 V depending on the model.

It works together with the [xtender](https://studer-innotec.com/xts/) or [next](https://studer-innotec.com/next1/) series of inverter-chargers to build complete solar systems.
 Directly compatible with our xtender series of inverter-chargers and our next series with the xcom 485i-nx for offgrid/ongrid installations.

**It can also work alone in 12/24/48V systems for example**, in a telecom system. The vario chargers have been used in standard solar systems as well in **special applications (hydro, DC/DC converters, DC minigrid).**

The vario chargers are compatible with all 12V, 24V, 48V (depending on the model chosen) battery chemistries (lithium, lead, Na+…), either communicating or not. A very flexible battery profile configuration helps you to adapt to each technology.