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 intelligentRE™ designed for controls and monitoring. WRH Telecommunications™ predominantly uses lithium-based batteries at the site location because:
- 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 the 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 overall cost of energy and consequent cost of ownership across its asset class.