Inside the SARBS Rectifier: 85–300V AC Down to 54V DC

Grid voltage at a Bangladeshi tower is rarely a textbook 230 volts all afternoon. A rectifier that only behaves inside a narrow window will drop the site just when the line sags. SARBS specifies its rectifier to convert 85 to 300 volts AC into 54 volts DC.

What is in the shelf

The system is described as a compact, intelligent power plant with up to six rectifier modules, a controller, AC input and DC output. The size is part of the design: a short shelf is easier to land in an existing shelter or outdoor cabinet. Modules are universal, so a failed module is a swap rather than a redesign.

Fifty-four volts is the charge and bus voltage the radio and the 48V battery string expect. The rectifier’s job is to hold that bus while it also refills the battery after a grid failure. Wide AC input means the same plant can sit on a weak rural feeder or a healthier urban one.

What else the module can show

• Tenant-wise current and watts, so shared sites can see who is drawing power.
• Battery information on the display, so a visit starts with facts.
• A built-in remote monitoring path, covered in more detail in the RMS article.

SARBS introduced the wider hybrid plant, 18kW to 30kW, on its LinkedIn page as a telecom DC power system. The rectifier is the heart of that plant. See it with the other hardware on the products page.

Figures and product notes on this page are taken from the public SARBS website, the SARBS LinkedIn page and the SARBS YouTube channel.