=====  Energy Storage and Distribution  =====

====  Overview  ====

At the core of the renewable energy plant is an all-in-one proprietary unit, the ZBB EnerStore, which allows the plant to operate "off-grid". This system performs the following major functions

  * Input rectification or conversion of the varying renewable sources.
  * Battery storage of power for later use
  * AC Output Inverter

The output is then fed onto a separate building micro-grid, using standard 3 Phase 415VAC voltage, that is connected to certain devices and powerpoints placed throughout the building that are solely powered by the renewable energy generated. 

====  ZBB EnerStore  ====

A promotional video describing the system from the manufacturer is [[https://www.youtube.com/watch?v=yCvvFS5bYLo|available here]] and for an explanation of how the flow-cell technology works see [[https://www.youtube.com/watch?v=W4HoiRgXjSI|this video]].

===  Flow Battery Specifications  ===

  * Zinc-Bromide (Zn-Br2) flow battery technology.
  * Ionic charge is stored in ZnB solution
  * High cycle life. 1000's of full discharge/recharge cycles with no loss of performance.
  * Capacity: 2x 50kWh Flow Batteries (100kWh total)
  * Maximum charging rate: 17kW
  * Maximum discharging rate: 25kW
  * 70% Round-trip efficiency at the DC point of connection (inclusive of all auxiliary power loads).

===  Inverter Specifications  ===

  * Max Continuous Output Power: 25kW
  * Max Continuous Output Current: 69A

==== Micro-Grid ====
The building microgrid is fed directly from the ZBB EnerStore output AC inverter to a Main Distribution Board.
It outputs power to the following devices and locations via sub-distribution boards:

  * Basement Electric Car Charging Outlets (not yet implemented)
  * Deans Winter Garden Grow Lights
  * Level 9 Common Room
  * Labs on level 6, 10


====  Downloads  ====

  * {{:technical:renewables:ac-pcu_25kva_specifications.pdf|Inverter Specs}}
  * {{:technical:renewables:30-000361_50v31c_manual.pdf|Enerstore (Battery) Manual}}
  * {{:technical:renewables:flow_battery_schematic.pdf|Flow Battery Electrolyte Circuit}}
  * {{:technical:renewables:flow_battery_chemical_process.pdf|Flow Battery Electrical Process}}
  * {{:technical:renewables:zbb_electrolyte_msds.pdf|ZBB Electrolyte MSDS}}
  * {{:technical:renewables:hazards_register.pdf|Hazards Register}}
  * {{:technical:renewables:znb_barrels_storage.doc|Zinc Bromide Storage Risk Assessment}}
  * {{:technical:renewables:znb_storage_swms.doc|Zinc Bromide Storage SWMS}}
  * {{:technical:renewables:znb_barrels_removal_from_site.doc|Zinc Bromide Movement Risk Assessment}}
  * {{:technical:renewables:znb_removal_swms.doc|Zinc Bromide Movement SWMS}}  
  * {{:technical:renewables:zinc_bromide.pdf|Zinc Bromide Safety Handbook}}
  * {{:pecc_control.pdf|CON3 Control Schematic}}
 
==== Links ====
  * [[http://www.zbbenergy.com/products/flow-battery/zess-50/|ZBB EnerStore Website]]