An inverter that handles inrush current

When the aircon brings more issues than solutions

Indian Tower Companies were facing a problem: for their radio equipment to function properly, they had to install air-conditioning units in their telecom shelters. But, when starting up, the air-conditioning unit requires several times the nominal current. And due to the local temperatures and the heat generated by the radio equipment, this situation typically repeats itself several times per hour. When the AC power (Grid or generator set) is not present, which is most of the time in these off-grid locations, the high inrush current required by the aircon must be provided by the batteries through the inverter.

Bravo-HC-block-diagram---initial-situation

This is where the Tower companies were facing their issues:

  1. Inverters usually have a hard time coping with the peak demand of an air-conditioning unit
  2. Due to the typically low capacity of the batteries used in these shelters, the repetition of the peak demand several times per hour really impacted their lifetime, usually reducing it by a factor of two. Which lead to a non-negligible financial impact!
  3. There was also no space available for the inverter in the telecom racks, so it could only be mounted on a wall or even at the back of the shelter’s door!

Introducing the TSI Bravo HC

As a leader in AC backup technology, CE+T Power was naturally approached by several Tower Companies to see if something could be done to improve this situation.
It turns out that CE+T Power’s TSI Bravo inverter could do the job almost single handedly and only required a few tweaks:

  1. Starting an air-conditioning unit with a power demand equal to that of the Inverter’s active power required only a few software changes that were then grouped in the now so-called “Airco Function”. So a 2500VA TSI Bravo HC in which the said option is activated per default, can start a 1.5 ton aircon!
  2. CE+T Power engineers came up with a “DC soft start” function that prevents the peak demand to be passed on to the batteries.
  3. A new hardware packaging was designed to allow for vertical or horizontal mounting of the TSI Bravo HC

Bravo-HC-block-blog

More details on the TSI Bravo HC on our Website