Storage

Energy storage is a critical component for strong-grid, weak-grid and off-grid telecommunication sites. The storage element is essential in providing backup and/or bridging power to the generator for short and long-duration outages.

Lead acid batteries are used predominantly in strong-grid sites because they are rarely exercised and remain on float charge for the majority of their life. Lead acid batteries in float application will last a long time, unless elevated temperatures are present for extended periods of time. At these “hot sites”, lead acid batteries often fail in 2-5 years, making lithium-ion and other non lead-based battery chemistries more attractive from a levalized cost of battery energy basis.

The renewable-based hybrid power systems designed, constructed and operated by WRH Power Systems, predominantly use lithium-based batteries combined with solar panels, thermal (diesel) generators and intelligent WRH Telecommunications’controls and monitoring. WRH Telecommunications’ sites predominantly use lithium-based batteries because the sites:

  • Have weak-grid power or are off-grid,
  • Are in hot geographic locations with limited environmental control,
  • Have high penetrations of renewable energy generation (Greater than 95%) and operate predominantly on battery during times of limited or no renewable generation,
  • Charge the battery from the thermal generator at optimal generator efficiencies during prolonged renewable outages due to extreme weather conditions and
  • Rely on the battery for all fluctuation in grid power.

    WRH Telecommunications is constantly improving its controls and monitoring to reduce the levelized cost of energy and consequent cost of ownership across its asset class.