On Services is the premier nationwide critical power service provider servicing all types of critical power equipment: Uninterruptible Power Supplies (UPS), Flooded or VRLA Batteries, 48 VDC Power Plants (Rectifiers), Power Distribution Units (PDU), generators, HVAC and more. On sells and services all brands of UPS and battery systems, which includes installation, commissioning, PM inspections, remedial service repairs, complete battery string replacement, and decommissioning of UPS and Battery systems. On also services HVAC and backup generator systems.