Inverter or 12/24/48 V battery charging: a new choice for Atlas and Magnum

TESUP charge controllers with their display and dial, lined up on TESUP cartons in the warehouse

October 09, 2026

When you order an Atlas or a Magnum, you can now choose how its generator is wound: for a grid inverter, or for charging 12, 24 or 48 V batteries.

Most homes send their wind power to an inverter. Others store it in a battery bank, off-grid or as backup. The two need different things from the generator, so we now wind it to suit the way you will use it.

Diagram: the standard 0.55 mm winding feeds a grid inverter for home power; the battery option with a 0.90 mm winding feeds a charge controller and a 12, 24 or 48 V battery bank — Schematic only. The Magnum uses the separate TESUP charge controller; the Atlas has one built in.

For an inverter: the standard winding

By default the generator is wound with 0.55 mm copper wire. That suits a grid inverter for home (on-grid) power. On an on-grid setup, keep your inverter's MPPT turned off. You do not need a charge controller or batteries.

For batteries: the 0.90 mm winding

If you charge batteries instead of an inverter, tick the battery option on the product page. We then wind the generator with thicker 0.90 mm copper wire, made for 12, 24 or 48 V battery banks. Thicker wire carries more current at the low voltages a battery bank works at.

The brain: the charge controller

Close-up of a TESUP charge controller with its three-digit display, dial, serial-number label and indicator lights — The TESUP charge controller: display, dial and its own serial number.

Between the turbine and the batteries sits the charge controller. It converts the turbine's AC output to DC, manages charging, and brakes the turbine at the maximum voltage you choose, anywhere from 0 to 400 V. It handles up to 15 kW, has fully automatic turbine protection and a manual emergency brake, and connects to MyTESUP for monitoring.

A TESUP charge controller seen from the front and another from the back, showing its connectors, sensor socket and cooling fins — Front and back: the connections, the sensor socket and the cooling fins.

The Atlas has its charge controller built in, so it connects straight to your battery. The Magnum connects to your battery and inverter through the separate TESUP charge controller. Every TESUP charge controller is tested before it ships.

Which one do I need?

Home power through a grid inverter: keep the standard winding. No charge controller or batteries needed.
Off-grid or battery backup: tick the battery option for the 0.90 mm winding. Atlas connects straight to the battery; Magnum adds the charge controller.