Smart Solar Energy

BRE National Solar Centre, Eden Project

January 2015

Keith Hounsell – Green Acorn

Contents

• The Technology – stack, electrolyte and what it

means for you

• The Product Range – Jabil manufactured modules

• The REDT Advantage – key benefits summarised

• Wind Case Study – community cooperation and

constrained wind

• PV Case Study – making solar work as it should

• Grid Services – earn more from your system

The Tech – Escape The Confines of the Cell

• Conventional batteries have fixed power and energy locked together in the cell

• Flow battery uses liquid

electrolyte contained outside

cell and pumped through it –

like car engine and fuel tank

• Liberates energy from power

component allowing long

duration storage that can be

scaled to your exact needs

The Stack – Designed for Deep Discharge

• Conventional batteries often damaged if discharged below 50%

• For this reason they are oversized relative to your requirement

• REDT design allows for

deep discharge – 100% to 0% and back without degradation

The Stack – Heart of the System

The Electrolyte – Life Extension

• Typical use lead acid battery life ~ 1,500 cycles

• Typical use lithium battery life ~ 5,000 cycles

• REDT battery life 10,000+ cycles – perfectly matched to most renewables

• All vanadium electrolyte still usable after this

0

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0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Battery Life Cycle based on Depth of

Discharge

VRFB

Lithium

Deep CycleLead Acid

GEL LeadAcid

Jabil – Finding the Perfect Partner

• ISO9001 accredited manufacture with workmanship guaranteed

• Supply chain expertise and

huge purchasing power bring down the cost

• Standardised but modular designed

…but all whilst ensuring manufacture stays within the UK!

The Modules – REDT Product Range

8

5-30 10-30

5-60 10-60 15-60

15-180 30-180 45-180 60-180

Constrained Energy – A Day in the Life

Blue = ESS kW, Charging when negative Red = Stored energy MWh start/finish @

zero SOC

The Connection – Timed Dispatch

The Truth About Turbines – Theory vs Practice

PV

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More Uses = Higher Revenues

Financial

• Minimise connection and line upgrade costs

by peak-shaving and time-shifting

• Enable more rapid connection permitting

• Maximise supply revenue/savings – More energy to local demand

– Higher tariffs with peak power timing

– Arbitrage & trading opportunities

• Receive higher subsidy

• Reduce reactive power charges

• Hedge against rising power prices

• Additional payments from grid services

Quality

• Increased power quality – brownouts, asset life

• UPS & islanding functionality

• Autonomy – contract freedom

• Smart appliances & DC integration

Environment

• Increase renewables

penetration up to 100%

• Achieve zero emissions

• Facilitate EV charging

Grid Services – Leading Candidates

• Firm frequency response up to £60/kW/yr

• STOR up to £40/kW/yr

• Triad management

• DNO services – dependent on local factors

• Also consider FCDM, Fast Reserve

www.greenacornenergy.co.uk

info@greenacornenergy.co.uk

Tel: 01326 336104