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A Step Forward Toward Greener Diesel Grids SOLAR FUEL SAVER: Xavier Juin Sales Manager Hybrid Systems

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A Step Forward Toward

Greener Diesel Grids

SOLAR FUEL SAVER:

Xavier Juin

Sales Manager

Hybrid Systems

Content

1. The juwi Group

2. Solar Fuel Saver Motivation

3. General Working Principle of “Fuel Saving Applications”

4. Technical and Economical Analysis

5. Applications and Advantages

1. juwi Group

Organisation

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 3,100 megawatt (approx. 2,300 systems)

Annual energy output

Approx. 5.8 billion kilowatt-hours, corresponds to

the annual power demand of around 1.7 million

households

Investment volume (since 1996)

Approx. 6,0 billion Euro

Employees & turnover

Approx. 1,250 employees (worldwide)

> 700 million Euro in 2013

WE MAKE IT HAPPEN

juwi at a Glance

Our Services: All about the Project

Consulting &

Acquisition Management Consulting &

Acquisition Planning Development

Financing &

Sales Construction

Operation &

Service

juwi has installed over 3000 MW

in more than 20 Countries

Location: Lieberose, Germany, PV capacity: 71.8 MWp, various wind projects globally

with 1250 MW

2. Solar Fuel Saver Motivation

Motivation

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

• 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 constant power

applications

• Diesel Generator market:

World-wide approx. 60 GW /

year (at least 10 GW for SFS

applications!)

Generation costs by diesel generators

In most of the sunbelt countries, generation costs

in diesel generator systems are > 0,30 € / kWh

Whereas generation costs of PV applications in

the same area are < 0,15 € / kWh

3. General working principle of “Fuel Saving Applications”

The Solar Fuel Saver (SFS)

100 %

30 %

0 %

100 %

90%

0 %

• Solar power is directly injected into the diesel generator mini-grid

• Reduction of fuel consumption due to solar energy penetration

• No batteries are needed

• The SFS controller manages the solar power output according to

the operation of the diesel generator

Functionality shown on a realistic load curve

The solar power reduces

the power generated by

the diesel generator.

As soon as the generator

reaches critical part load

operation, the SFS

controller reduces the

power output of the solar

plant.

Hybrid Systems

Solar Fuel Saver Battery storage systems

Solar Inverter

Solar Inverter

Battery Inverter

(Bidirectional)

Customized Solution

• The SFS can be integrated in already

existing systems

• Measuring equipment can easily be

adapted and integrated

Spinning Reserve

• As long as all generators are

running, they provide the spinning

reserve.

• Individual generators cannot be

switched off.

• If there is a cloud and therefore PV-

energy breaks down, the generators

can provide the needed energy.

Option 1 - from the generator

Option 2 - from the battery

Solar Inverter

Battery Inverter

(Bidirectional)

• In this case, the spinning

reserve has to be provided by

the genset and the battery.

• Needs to be verified

individually if the additional

expenses for the battery

system are economical.

Spinning Reserve

100 %

85 %

0 %

Balanced Load

100 %

30 %

0 %

300

300

300

Total 900 kW

PRP = 1000 kWMin.30% = 300 kWMax PV = 700 kW

100

100

100

Total 300 kW

200

200

200

Total 600 kW

Unbalanced Load

50

350

500

Total 900 kW

PRP = 1000kWMin.30% = 300 kWMax PV = 700 kW

0

300

450

Total 750 kW

50

50

50

Total 150 kW

100 %

21 %

0 %

100 %

75 %

0 %

4. Technical and economical analysis

What makes a SFS project economically interesting

• High and constant loads during daytime

• Diesel generator is constantly running during sunshine hours

• Diesel generator as main power producer and not in standby or back-up operation

• Balanced electrical phases

• Stable grid conditions (frequency, voltage, power factor,…)

• Well-designed diesel systems, running >80% of their PRP (Prime Power)

Rule of thumb: PV size is approximately 80% of max load (in kW)

High and low PV penetration

High PV penetration

• High fuel savings

• Excess energy

• High CAPEX

Low penetration

• Less fuel savings

• Less CAPEX

• More potential possible

Exess

Energy

More PV

possible

Example – 1 MWp SFS in Philippines

1. Input Data (Client)

2. Technical Results

[kW] [kW]

[%] [kWh]

[USD] [USD]

[years] [USD]

[USD] [%]

[USD/l] [years]

[%] [%]

[kWh]

[kW] [l p.a.]

[years] [USD p.a.]

[% p.a.]

[%] [t p.a.]

[%]

20,00

Gen

era

l

Energy consumption

Project Lifetime

Opex escalation

Peak Load

Tax rate

Discount rate

Gen

set

Increase of fuel price

Fuel price

Generator power

Minimal partial load

Opex

Replacement period

Replacement costs

3,00

5.000

4

671.187

PV

-SF

S-S

yste

m

Power PV System

Annual solar production

Investment

Opex PV

Equity ratio

Lent term

Interest rate (Initial)

1.600

30,00

1.000

1.420

2.080.000

20.000

30,00

10

10,00

7.710.610

1,17

Resu

lt O

verv

iew

Diesel savings

Average cost reduction

CO2 reduction

350.692

234.914

925,8

7,00

15

2,00

1.177

Monthly Average Electric Production

Day with maximum solar fraction [kW] Day with minimum solar fraction [kW]

0

200

400

600

800

1000

1200

00:00 05:00 10:00 15:00 20:00

0

200

400

600

800

1000

1200

00:00 05:00 10:00 15:00 20:00

0

200.000

400.000

600.000

800.000

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Pro

du

cti

on

[kW

h]

Economical Analysis

3. Economical Analysis Break-even

after 4 years

Input Data for evaluation

What do we need from you ?

1. Filled-out SFS questionnaire (Attention: there are two questionnaires, a. Battery based hybrid systems and b. SFS )

2. Most important: hourly data of load curve (for a typical day or for a typical period)

The quality of our technical & economical evaluation corresponds to the quality of your data

www.juwi.com/solarfuelsaver

5. Applications and Advantages

Applications

Hotels and Resorts (typically 100 kW – 2 MW)

Daytime loads like air-conditioning, water pumping,…

Residential Areas (typically 100 kW – 20 MW)

With relatively constant power demand

Mining Industry (> 2 MW)

High suitability due to constant loads at quite high power output

Industry and Agriculture (typically 500 kW – 20 MW)

High solar fraction possible, due to consumption during daytime

Own

Consumption

Market! (private sector)

Your Advantages

• Save up to 50% diesel fuel in your application! Client with 24-hour constant load: SFS can reduce the fuel cost by 20%

• Become more independent from your diesel supply! Clients with insecure sources of fuel, remote areas,…

• Reduce your LCOE! Adding solar to your diesel grid will bring down the levelized cost of electricity

• Achieve short payback periods with a low-risk investment! In sunbelt countries with a diesel price > 1 US$/liter, payback is between 3 and 6 years!

Solar Fuel Saver (Maldives, Kudahuvadhoo atoll)

Description of the Systems

Solar System

203,5 kWp poly crystalline PV-modules on 8 rooftops

3 Diesel Generators: 648kW, 600kW and 440kW

Load: between 300 and 500kW

Objectives

This project is based on a Solar Fuel Saver technology

which enables to reduce the fuel consumption of the mini-

grid of Kudahuvadhoo island.

The power plant supplies the island mini-grid via medium

voltage lines. The main consumers are residential

households, small and medium-sized businesses and the

local hospital. The project is part of the GIZ program to

help the ministry of environment strategy for carbon

neutrality.

Realization

The system was built by juwi and a local partner in 2014.

Solar-Wind-Diesel System (Egypt)

Technical Data

Solar System: 50 kWp

Wind turbines: 50 kW (4 turbines with 13 kW)

Battery: 11200 Ah / 48 V OPzS 4 Battery Banks

Diesel Generator: 1140 kVA, 1 x 350 kVA

Inverter concept: SMA AC-coupling with Sunny Islands

Objectives

• electricity for the local pumps for irrigation.

• the batteries have enough capacity to store the

produced electricity also for long sun- and windless

periods.

• a plant to desalinate the salty ground water is also

connected to the system

Realization

October of 2012 with our local partners.

Solar-Diesel Hybrid System (Namibia)

Technical Data

Solar system: 201 kWp Poly crystalline PV-Modules

3.420 m² Free Field Installation

21.840 Ah / 48 V OPzS Battery Bank

Diesel Generators: 2 x 140 kVA, 1 x 350 kVA

Objectives

• centralized solar PV system in Tsumkwe (ca. 600 km NE of

Windhoek)

• supply the total day time demand of the village

(incl. Telecom station, school and hospital)

• diesel generators will supplement the battery system and

select the optimum generator to run

• each home is connected with a 11-kV line

one line for essential loads (will not be disconnected),

one as “non-essential” will be disconnected to prolong

services to the essential loads

Realization

First half of 2011 with local partners. O&M contract for 5 years

Thank You!

juwi international GmbH

Xavier Juin

[email protected]