Solar Fuel Saver

An intelligent solution to decrease fuel consumption for diesel generator systems

Solar Fuel Saver

1. Juwi at a Glance

2. Motivation to implement a Solar Fuel Saver system

2.1 Solar vs. Diesel costs

2.2 Electricity generation

3. Juwi Solar Fuel Saver

3.1 Definition

3.2 Advantages

3.3 Functionality of the SFS

3.4 Technical features

4. Applications

Juwi at a Glance

Company structure

Founded in 1996 by Fred Jung and Matthias

Willenbacher (juwi), pioneers for renewable

energies with agricultural roots

juwi AG is an owner-managed group of

companies and not listed on the stock exchange

Total capacity

Around 2,500 megawatt (approx. 2,200 systems)

Annual energy output

Around 4.5 billion kilowatt-hours, corresponds to

the annual power demand of around 1.3 million

households

Investment volume (since 1996)

Around 5.2 billion Euro

Employees & turnover

More than 1,700 employees (worldwide)

Approx. 1.1 billion Euro in 2012

International offices and project locations

Our Vision

Technical & Commercial

Operation and

Maintenance

Wind Energy

Solar Energy

Bioenergy

Hydro Power

Electricity

Heat

Wood Fuels

Energy Efficiency

Passionately work together to implement renewable energies

economically and reliably.

100% Renewable Energies

Energy SolutionsProjects

Cooperations & Joint-Ventures R & D

Operation

On-grid solutions

50 MW, Wind farm in Costa Rica

10 MW, Wind farm Wörrstadt

52,79 MW free-field installation, Lieberose (Brandenburg)

2 MW, El Cura (Spain)

Off-grid solutions

Off-grid village electrification in Namibia with 200 kWp PV

and a 1,05 MWh battery bank

50 kWp Solar

Hybrid system in Egypt

50 kW wind

Motivation to implement a Solar Fuel Saversystem

• The price for PV systems has decreased by more than 60% in the last 3 years

• Fuel costs for diesel generators are constantly rising

• Especially interesting for gensets in continuous power applications

In many countries, PV-Diesel Systems present an economically viable solution, already today. This effect will even increase in the next years.

Time

€ / kWh

Today

Generation costs by diesel generators

For most sunbelt countries (colored in green)• Generation costs by diesel generators are > 0,30 € / kWh• Generation costs in the same area by PV < 0,15 € / kWh

Map: Source Reiner Lemoine Institut

Definition

• Solar power is directly fed into

the diesel generator mini-grid

• No batteries are needed

• Reduction of fuel consumption

thanks to solar energy

• The SFS controller manages the

solar power output according to

the operation of the diesel

generator

The Solar Fuel Saver is a controller allowing the direct integration of photovoltaic power

plants into fossil fuel powered mini-grids.

Specifications:

Display as single point of operation

• Reduced fuel consumption of the diesel generators up to 50% depending on load profile and climate

conditions

• Less dependency on oil price fluctuations

• Short payback time: approximately 4 years based on a diesel price of 1 €/liter

• Low investment costs (as no batteries are required)

• Flexible controlling possibilities of the diesel generator

���� The Solar Fuel Saver is the perfect solution to cut down on generation costs of existing or new

diesel generator grids.

Juwi Solar Fuel Saver - Advantages

Functionality of the SFS

The solar power reduces the power

generated by the diesel generator.����

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As soon as the generator reaches critical

partial load operation, the SFS controller

decreases the power output of the solar

plant.

Technical features

• The Solar Fuel Saver can be integrated into existing or new

diesel generator grids. It operates with all standard generators

(isochronous or droop controlled).

• By regulating the solar power output, the SFS controller

guarantees an optimized operation of the diesel generator

• Protection against min. partial load

• Reverse power protection

• Flexible reactive power controlling

• Additional control options of the diesel generator: time based,

partial load

• Integrated data logging of system performance

• Remote monitoring via internet (optional via GSM)

• Simple installation (plug and play)

Hotels and Resorts

Residential Areas

Mining Industry

Industry and agriculture

Daytime loads as air-conditioning, pumping and cooking can be covered

Supermarkets, offices, craft shops have load profiles with peak consumption at daytime Individual solutions for small villages with special load profiles

High suitability due to constant loads at relatively high power output in remote areas

High solar fraction possible, as electrical consumption for pumping and cooling can be adapted to irradiation curve

Applications

Next step: free pre-feasibility study

Juwi offers a free pre-feasibility study for systems > 100kW consisting of

- customized technical layout

- economical analysis

Visit www.juwi.com/solarfuelsaver,

download the questionnaire and

send it to fuelsaver@juwi.com

Thank you for your attention!

Contact:

Steffen Rauer

juwi international GmbH

Energie-Allee 1

55286 Wörrstadt

Germany

Tel. +49. (0)6732. 96 57-1781

Fax. +49. (0)6732. 96 57-0

Steffen.Rauer@juwi.de

www.juwi.com/solarfuelsaver