The Victron BlueSolar PWM-LCD&USB 48V-20A is a pulse-width modulation solar charge controller built for 48V battery systems. It suits off-grid installations where an on-device display and USB charging output are useful. The built-in LCD gives installers and users direct visibility of system status without a separate monitor.

Key features of this solar charge controller for solar panel systems

• System voltage, 48V with a 20A maximum charge current, suited to small to medium off-grid arrays.
• LCD display, shows battery voltage, solar input, charge current and charge state.
• USB output, integrated port for charging low-power devices from the solar system.
• PWM charging, reduces overcharge stress during the float stage.
• Battery compatibility, works with sealed, gel and flooded lead-acid batteries.
• Weight, 0.3 kg, suitable for panel mounting in enclosures or on DIN rail with an adapter.

How it works

PWM controllers connect the solar panel directly to the battery once the bulk charge threshold is reached, then switch the connection on and off rapidly to hold the target voltage. This suits smaller systems where panel voltage is closely matched to the battery bank. The 48V rating suits larger off-grid battery banks where a higher nominal voltage reduces cable losses.

The LCD removes the need for a separate battery monitor or app to check basic status. Charge current, battery voltage and charge stage are all readable on the unit itself. The USB port is a practical addition where small devices such as phones or radios need charging without an inverter. This model does not have Bluetooth or VE.Direct connectivity, so remote monitoring through the Victron ecosystem is not available.

Applications

Small off-grid cabins and outbuildings with 48V lead-acid battery banks. Remote monitoring stations or telecoms enclosures needing a 48V solar charge source. Agricultural or rural installations where a simple, readable controller is preferred. Backup power systems using 48V flooded or sealed lead-acid batteries, and demonstration solar setups where an on-device readout is useful.

What's in the box

• 1 x Victron BlueSolar PWM-LCD&USB 48V-20A charge controller

Installation notes

This controller is intended for 48V nominal battery systems only. Connecting it to a battery bank of a different voltage will damage the unit. The solar panel open-circuit voltage must not exceed the controller's rated input. Installation should be carried out by a qualified electrician or experienced solar installer, following current UK wiring regulations for any off-grid system.