Float Battery Charger is not a standalone dedicated battery charger. Float battery charger along with a floating battery provide uninterrupted DC power supply to a critical load, such as supply to telecommunication & signaling equipment, SCADA network or supply to HV switch gear etc.

That is Float Charger or Float rectifier feeds the critical load as well as charges the battery. In the event of mains power outage battery feeds the load without any break in supply to the load. When mains power supply resumes Float rectifier charges the discharged battery and feeds the load.

In most of the applications the loads are not only critical to supply interruption but also to voltage fluctuation and ac superimposed ripple.

There are various topologies of Float Battery Chargers (commonly called Float cum boost Charger). Most popular among those are:

• Float cum boost battery charger with one rectifier.
• Float and boost battery charger with two rectifiers.
• Dual Float cum boost battery charger for more critical application with larger load.

In ESI we design and manufacture Thyristor controlled Float Chargers up to 220V, 300KW of each rectifier.