Segen Installer Conference, Feb 23rd 2012

Agenda Company Overview Conventional Solar Grid Systems Vs Enecsys Product offering Architecture and Topology Design & Safety Advantages of Enecsys Micro inverters Installation of Enecsys PV Systems Key Benefits (Customer, Installer& Technology and Local Economy) Questions

Company Presentation: Enecsys Ltd. 2003: Finalist in European Business Competition and finalist London Business School social venture business competition; Enecsys formed as Spin out of Cambridge University. 2004: Cambridge Enterprise Investment, DTI R&D grant 2007: Secured investment for development & pre-market testing 2008: CE and G83 Certification of Engineering Sample 2009: Funding $15M Series A received for commercialization of Enecsys Inverters June 2010: Product Launched at Intersolar Munich May 2011 Enecsys secures £25 million ($41 million) investment to accelerate its growth plan Aug 2011 Enecsys appoint Mike Fister as CEO (This is a world class person, as he was one of the top executives of INTEL, and then CEO of cadence design systems (Revenues of $1bn) Institutional Investors:

Conventional Solar Grid Connected Systems Conventional solar systems have: Modules attached in series strings One large string inverter High Voltage DC Visibility at system level only Focus of industry has been on: Inverter efficiency Low cost per Peak Watt Experience shows this to be a sub-optimal solution in real world conditions Inverters must be replaced at least once in lifetime of modules: 2X cost Harvested energy below expectation due to MPPT difficulty & module performance variation: Aging, dust, reflections, shadows Requires nearly ideal conditions for high performance Expensive to plan, install and maintain

Enecsys Solar System Architecture AC- Module Enecsys modular micro-inverter based solar systems have significant advantages vs. conventional DC string systems: Maximised harvested energy: shading & defect immunity, reduced cabling losses, and power optimisation (MPPT) for each module individually No single point of failure Safer system as high voltage DC is eliminated: simple, standardized, cost effective installation with no specialist DC installers System management and performance enhanced through communication down to the individual module level Enecsys Enables a Simpler Solar System Architecture with Superior Performance and Lower Cost 5 5

Unique Patented Energy Control System Low life unreliable components used in conventional inverters are: Electrolytic capacitors and opto-couplers Premium industrial electrolytic capacitor only have an operating lifetime of 7,000hrs at 105C Typical energy storage requirements are very high compared to Thin Film Capacitors Typical life of conventional inverter is ~10 years Purpose of the Enecsys Energy Control Technique: Removal of low life time components Improved stability and maximum power point tracking Typical life of Enecsys Micro-Inverter is >25 years Thin film capacitors have a lifetime of 30,000 hours at 105C with significant increase in reliability The Enecsys inverter using only thin film capacitors

Design Advantages of Enecsys Micro Inverters Enecsys Micro-inverters have no distribution or concentration of high DC voltage and high current Arcing caused through the distribution of high DC voltage is no longer a concern DC wiring is only in the vicinity of the module Maximum DC voltage is 60V as opposed to 1000V Micro-inverters can be used over non-grounded DC systems Thermal cut out at 110 degrees C – providing local isolation Wiring is intrinsically safe > total circuit current capacity Micro-inverters are compliant with the changes in NEC 2011 Electronic inverters secured in fire approved enclosures Removal of the utility AC power results in the system automatically shutting down

Installation of Enecsys PV System General Information: Installation Diagram Wiring Example and Limitation Survey Planning Installation: Installation Process 1st Step: Installation of the Communication System 2nd Step: Installation of the Enecsys Micro-inverters 3rd Step: Connexion of the Enecsys Micro-inverters 4th Step: Check Communication Link 5th Step: Set Live Monitoring System Monitoring Access User Monitoring Installer Monitoring

Site Survey Recommendations to keep in mind when surveying, planning and preparing to install Enecsys solar micro-inverter system: Type of roof: Metal or foil backed insulation will obstruct communication and may require a double repeater Availability of a broadband internet connection The internet router contains an available network socket with a spare power supply socket nearby What is the distance from Enecsys gateway & Enecsys Micro-inverters (do the premise need repeater(s)?). There is a spare power socket for repeater when needed (Between Enecsys gateway & Enecsys Micro-inverters) in case communication need to be amplified. EDIT..need distance of g-r-dr-1st inverter

Equipment Selection Ensure you have selected the appropriate Module for you application and the corresponding inverter type. Select the Module – Enecsys Inverter combination for your application Ensure that you understand the mounting methodology for attaching the inverters to the racking system and have procured all the hardware to install the micro-inverter onto your mounting structure (M-8 SS) bolts including the PV-JB to AC system transitioning hardware. Plan the positions of the micro inverters according to the roof layout, i.e. position of the mounting structure and the junction box of the module. Plan the AC cabling to connect the micro inverters.

Simplicity of Design and Installation Use all available roof space eliminates desing headaches Use with any combination or quantity of Heliene Modules No single point of failure No DC BoS components such as Combiner Boxes, Switches and fuses BoS and Labor saving up to 15% even more in the design stage System can be easily expanded System is very safe: no high DC voltage, no risk of electrical arc Inverter lifetime Savings in design can exceed 50% over conventional String inverters, especially in the design and intial layout of modules.

Installation Planning: No Specific Tools No Design Software need to configure modules vs. string inverter No need to group modules No crimping tools needed to build DC Home Run Connectors anymore No need for Combiner Box(s) installation No specific tools necessary with Enecsys PV system Stop here for Lunch...

Installation Diagram Enecsys Micro Inverter Distribution Block PV Module Grid Connect Cable Enecsys Repeater Enecsys Gateway Enecsys Monitoring

Wiring Example All Work should be performed by qualified personnel. Limit of Inverters per AC branch The maximum number of inverters in each AC branch circuit will depend on the Inverters Maximum Output Current and the maximum allowable AC current of that branch. Each branch circuit installed must have overcurrent protection and be installed in accordance with local and National codes and regulations. Start your AC bus with distribution unit to spread the load, and avoid circle loop. All Work should be performed by qualified personnel.

Standard Electrical AC system design and installation AC Branch Circuits POCCAC Main Electrical Grid PV System Junction Box AC System Standard Electrical AC system design and installation Home Use N # of AC Electrical Branches

Wiring Example Exercise Determine the Number of Inverters, Distribution Blocks, Buss Extension Cables and Buss Grid Connection Cables Used in this wiring example. Can you optimize the design?

Install Enecsys Micro-inverters Easy to install on almost any mounting structure with the handle of the Micro Inverter Layout and install Record the position and serial number of each inverter

Connection of the Enecsys Micro Inverters The Push-Clip System is Plug & Play Connect the Inverters Attach End Caps Secure the AC cabling to the mounting structure Connect the Modules to the Inverters Connect the branch circuit to the POCC

Check Communication Link Check signal strength Add Repeater(s) as needed Verify all Inverters are reporting and Gateway has a √ sign Verify Internet connection is established

Monitoring Monitoring access: User Monitoring: Installer Monitoring: www.monitor.enecsys.com User Monitoring: Quick View System View Can only see their system Cannot make any modifications Installer Monitoring: Live Installation Create New Installation Can add installations (user accounts) Can monitor multiple user accounts

Key Benefits of the Enecsys Micro-Inverter System Skills present within local labour workforce Minimal investment in new training requirements Plug & Play - lower installed cost Lifetime equivalent to module – 25 years Product Warranty 20 years Higher harvested energy in ‘real world’ High performance system monitoring Opens up large new markets, Vision: 50% of Residential market will be Enecsys Micro Inverters – Sub 4KW Generating opportunities for small business enterprises Simplification of supply chain management

Enecsys Company Video

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