Storage Case Studies

The members of the storage working groups have given their storage case studies. Expand the tabs to see the different cases.

 

Energy storage case study

Approx. installation date 06.05.2016
Location of energy storage system London N16
Technology type: lead acid, lithium, thermal storage, flow battery etc. LG Chem LifePo4  6.4kWh battery.  Also Solic 200 power diverter switch to heat 3kWh water tank
AC or DC coupled system? AC.  Compatibility with Victron battery management components
Located with PV YES
Energy storage supplier LG Chem battery.

Victron battery management system

 

Was this a packaged system (i.e. all components coming from one supplier) or a bespoke system using multiple manufacturers/suppliers All components supplied by Wind & Sun who assisted with system design
System size 3.6kWh PV system.

6.4kWh battery with 3kWh battery inverter.

3kWh hot water storage

Briefly describe function of energy storage Energy storage to  maximize use of solar generated electricity in the home
Please list the motivation of the client for the energy storage system The client was interested in improving self-consumption of PV and reducing demand on the National Grid
Is the energy storage system designed to provide backup power? No
Other information In July 2016 customer total electrical energy consumption was  427kWh of which 9.5kWh (2.22%) was imported from the grid.

Customer electrical energy consumption in May 2016 was higher than consumption during all Winter months 2016/2017.

Total electrical energy consumption since 06.05.16 is 4579kWh which includes electrical energy diverted to heat water during summer months and solar energy diverted to the battery.  To date 38% of energy consumed has been imported from the grid.

British Gas Estimated grid annual energy usage over 12 months to 11.04.17 is 1827kWh.

Energy storage case study

Approx. installation date 06.07.2016
Location of energy storage system London NW5
Technology type: lead acid, lithium, thermal storage, flow battery etc. LG Chem LifePo4  6.4kWh battery.
AC or DC coupled system? Retrofit AC.  Compatibility with Victron battery management components
Located with PV YES
Energy storage supplier LG Chem battery.

Victron battery management system

Was this a packaged system (i.e. all components coming from one supplier) or a bespoke system using multiple manufacturers/suppliers All components supplied by Wind & Sun who assisted with system design
System size 6.4kWh battery with 3kWh battery inverter.

2.25kWh PV system (installed by other company a few years prior)

Briefly describe function of energy storage Energy storage to maximize use of solar generated electricity in the home and provide back-up storage in case of grid power outages
Please list the motivation of the client for the energy storage system The client was interested in improving self-consumption of PV, reducing demand on the National Grid and having power to run essential loads in the case of grid outage
Is the energy storage system designed to provide backup power? Yes
Other information Unfortunately, data for December 2016 and occasional other dates has been lost due to internet connectivity issues.

In August 2016 customer total monthly electrical energy consumption was 338kWh of which 27kWh (8.00%) was imported from the grid.

From the incomplete data available electrical energy consumption since 06.07.16 is 2215kWh which includes direct solar energy use and solar energy diverted to the battery.  To date (from the data available) 42% of energy consumed has been imported from the grid.

Prior to Battery storage installation, actual solar energy generation was 1784kWh.  Estimated grid energy consumption to  April 2016 (after solar but before  Storage installation) was 2534kWh.

Camborne Energy Storage Limited.

Energy storage case study

Approx. installation date October 2016
Location of energy storage system Somerset, UK.
Technology type: lead acid, lithium, thermal storage, flow battery etc. Lithium
AC or DC coupled system? DC, one main supplier who provided a bespoke system with separate inverters
Located with PV YES
Energy storage supplier Technology supplied by Tesla and EPC serviced by Poweri.
Was this a packaged system (i.e. all components from one supplier) or a bespoke system using multiple manufacturers/suppliers Packaged.
System size 500kWh/250kW
Photos of installation available

Briefly describe function of energy storage Energy storage system is used to provide frequency response services to National Grid.

 

Please list all partners on the project Tesla; Poweri Ltd; Open Energi Ltd.
Please list the motivation of the client for the energy storage system Camborne Energy Storage worked with the landowner to use spare capacity on the point of connection to locate a battery energy storage installation that would generate revenue from providing grid services.
Is the energy storage system designed to provide backup power? No.

Energy storage case study

Approx. installation date May 2016
Location of energy storage system Cupboard under stairs
Technology type: lead acid, lithium, thermal storage, flow battery etc. Sodium-ion battery (Aquion Energy)

With Victron inverter

AC or DC coupled system? AC-coupled – existing PV system
Located with PV YES
Energy storage supplier PV Kits Direct
Was this a packaged system (i.e. all components coming from one supplier) or a bespoke system using multiple manufacturers/suppliers Yes
System size 3kW, 5kWh
Photos of installation available
Briefly describe function of energy storage Time shifting for PV self-consumption only
Please list all partners on the project Photon Energy Ltd
Please list the motivation of the client for the energy storage system – Improving self-consumption of PV

– Trialling a residential energy storage system

Is the energy storage system designed to provide backup power? No

Energy storage case study

Approx. installation date 13th February 2017
Location of energy storage system Garage
Technology type: lead acid, lithium, thermal storage, flow battery etc. 6kWh Powervault G200 Lithium-ion storage battery
AC or DC coupled system? AC
Located with PV No – in the garage, but yes there is PV on the roof.
Energy storage supplier IRESA (11.2P in the day, 8p at night and 19.4p for standard charge in the day. Other information: bright fix Sep 2018 – 15.3p in the day and 6.3p in the night and 16.5p standing charge).
Was this a packaged system (i.e. all components coming from one supplier) or a bespoke system using multiple manufacturers/suppliers Yes, packaged system.
System size 6kWh
Photos of installation available
Briefly describe function of energy storage To minimise the amount of electricity customer needs to buy from National Grid, to help reduce his energy bills, gain greater independence from National Grid and have access to power during black outs. The energy storage unit includes an emergency power socket (to power essentials such as lights, wifi, etc.), includes a ‘time-of-use software’ allowing the unit to be controlled to charge or discharge energy to the grid so customers can benefit from smart tariffs. It is a complete system in a box including batteries, charger, inverter and cloud-connected control unit. It is compatible with all solar PV and smart meter systems.

 

The system allows homeowners to benefit from time-of-use tariffs, buying electricity from the grid when it is cheap to store it for use at peak times to cut bills further.

 

Please list all partners on the project Powervault and Green Acorn Energy
Please list the motivation of the client for the energy storage system Having already installed a 4kWp PV system in 2015, Mr. Hawley had already committed to making the most of his solar generation by installing a unit to heat hot water using any surplus solar energy. But he wanted to do more to minimise the amount of electricity he needed to buy from National Grid. His goal was to help reduce his energy bills further, gain greater independence from National Grid and have access to power during black outs

 

 

Is the energy storage system designed to provide backup power? Yes, especially when bought with an EPS (socket).

SolarEdge

Energy storage case study

Approx. installation date May 2016
Location of energy storage system External wall of property
Technology type: lead acid, lithium, thermal storage, flow battery etc. Lithium Ion
AC or DC coupled system? Reasons for system choice: DC Coupled system, increased efficiency and reduced installation cost
Located with PV Yes, PV is installed. No, inverter is not next to storage
Energy storage supplier SolarEdge PV system with Tesla Powerwall 1

 

Was this a packaged system (i.e. all components from one supplier) or a bespoke system using multiple manufacturers/suppliers? Package – however from 2 manufacturers.
System size 6.4kWh of storage on 4.25kwp PV system with 3.68 inverter

 

Photos of installation available
Briefly describe function of energy storage Improve homeowner’s self-consumption

 

 

Please list all partners on the project Installer: Joju Solar Homeowner: Glen Tweedie
Please list the motivation of the client for the storage system  

Improving self-consumption – see video at youtube link below.

 

Is the energy storage system designed to provide backup power? No

Solar Kingdom Ltd.

Energy storage case study

Approx. installation date May 28 2016
Location of energy storage system Domestic Property in Edinburgh
Technology type: lead acid, lithium, thermal storage, flow battery etc. Lithium ion
AC or DC coupled system? DC coupled. Available system compatible with existing PV system
Located with PV YES
Energy storage supplier Tesla
Was this a packaged system (i.e. all components from one supplier) or a bespoke system using multiple manufacturers/suppliers SolarEdge and Tesla
System size PV 5.44kWp, East, South and West facing, battery 6.4kW.
Photos available?
Briefly describe function of energy storage The system provides time shift of PV production

 

Please list all partners on the project Solar Kingdom Ltd, Tesla, SolarEdge.
Please list the motivation of the client for the energy storage system The system was installed to provide real experience and empirical data of what energy storage can provide in a residential/domestic environment.
Is the energy storage system designed to provide backup power? No.
Other information The system features the first Tesla Powerwall installed in Scotland. It has monitoring using both Solaredge and what is effectively a smart meter (GEO Solo 3).

The data covers self-consumption of generated electricity and contribution to total electricity consumption. By the end of May we will have twelve months data. Data collected already makes interesting reading. This has been presented at All Energy in Glasgow this year.

Energy storage case study

Approx. installation date 9th March 2017
Location of energy storage system Sandwich, Kent
Technology type: Lithium Iron Phosphate (LiFePO4)
AC or DC coupled system? AC coupled system.

A quick install that gave the ability to install in preferred location which was remote from the existing PV system. No interruption of existing PV system physically, or any impact on current FiT payment. The grid services part such as ability to charge from low cost tariffs and the potential to join sonnen community later was also stated as of interest.

Located with PV In the same property there is an existing PV system but the storage unit is not located next to the PV inverter.
Energy storage supplier sonnen GmbH
Was this a packaged system (i.e. all components coming from one supplier) or a bespoke system using multiple manufacturers/suppliers sonnenBatterie eco8 system which is “fully integrated” meaning all required parts are contained within the unit itself.

There are no external units or other components.

System size Input/output rating of inverter is 2.5kW

Storage capacity is 6kWh, but can be extended retrospectively up to 16kWh (in 2kWh increments) if required, using monitoring data of live system to provide evidence based case to do this.

Photos of installation available (coming)
Briefly describe function of energy storage The sonnen energy storage system is used to maximize the self-consumption of power produced by solar PV on site, allowing the user to be energy independent from existing utility companies.

In addition, there are several additional features of the sonnen system such as the ability to charge from the grid if required, control “smart” appliances and plugs and a full monitoring system of both the PV system and storage system.

Please list all partners on the project sonnen GmbH, installed by Total Electrical
Please list the motivation of the client for the energy storage system To maximize the use of power generated from existing solar PV system on site rather than export.

Secondly, they were keen to understand and support the latest technological developments and have the ability to monitor and track performance of their system and solar PV system over time.

Is the energy storage system designed to provide backup power? It is available as an option with an additional piece of hardware provided by sonnen. The focus is maximizing self-consumption, increasing independence from the grid whilst giving access to grid services rather than providing off grid capability.
Other information