pv own-consumption, feed-in tariff and system …...1 kwp →yield of 1200 –1600 kwh electricity/a...

Facilitatorr

PV own-consumption, feed-in tariff

and system integrationMichael Vogtmann,

Chairman of the German Society for solar energy

(DGS)

Durchführer

www.dgs-franken.de

Michael Vogtmann| PV Own-Consumption,

Feed-In Tariff and System Integration |

26.03.2019 | Seite 2

PV own consumption, feed-in tariff

and system integration

1. Electricity prices, PV generation costs, and feed-in tariff

2. PV-business models for direct consumption:

a) PV-system for self-consumption

b) power delivery to a third party

3. Outlook: benefit and economics in Sri Lanka

a) 3 kWp single-family house

b) 50 kWp hotel

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 3

Power purchase costs, feed-in tariff

and PV- generation costs

Electricity purchase

rising costs?

2% annually?

Feed-in tariffs

are quite

constant over

20 years

Grids are partly overloaded,

PV-direct consumption

will relieve the grids and

save costs

www.dgs-franken.de

DurchführerMichael Vogtmann| PV Own-Consumption,


26.03.2019 | Seite 4

here:12 moduls x 250 Watt = 3.000 Wattpeak = 3 kWp

Space requirements depend on the power to be

installed

7 square meters are needed for 1 kWp

1 kWp → yield of 800 – 1100 kWh electricity/a in Germany

1 kWp → yield of 1200 – 1600 kWh electricity/a in Sri Lanka

A 4-person household

in Sri Lanka needs

ca. 20 m² roof area

to produce

annually 4500 kWh. 1,66 m

0,99 m

1 kWp

250 Watt

www.dgs-franken.de



26.03.2019 | Seite 5

Electricity price 2019 in the private sector

In Germany: approx. 30 Ct/kWh

Much higher than the

PV-generation costs of approx. 11 Ct/kWh

and „EEG feed-in tariff“ of approx. 10 Ct/kWh

In Sri Lanka: between 5 and 22 Ct/kWh

Often higher than PV-generation costs

of approx. 7,5 Ct and „feed-in tariff“ of 12/8.5 Ct

Germany

Sri

Lanka

PV-generation costs Germany 11 Ct/kWh

PV-generation costs Sri Lanka 7,5 Ct/kWh

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 6

Electricity price 2019 in the commercial sector

In Germany: 15 to 23 Ct, on average 19 Ct

Much higher than the PV-production costs

and the EEG „feed-in tariff“ of approx. 9 Ct

In Sri Lanka: from 5 Ct up to 10,5 Ct

Higher than the PV production costs

→ same level as feed-in tariff

PV-generation costs Germany 8 Ct/kWh

PV-generation costs Sri Lanka 6 Ct/kWh

Sri

Lanka

2019

Germany

2019

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 7

PV own consumption, feed-in tariff

and system integration







b) 50 kWp hotel

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 8

Quelle: SMA

Increasing PV own-consumption through

Energy management

User Behaviour + 5 to 10 %

e.g. washing machine

Smart Home + 5 to 10 %

automated electrical devices

Direction of PV-system + 5 to 10 %

east / west instead south

Power-to-Heat, -to-Cool + 20 to 40 % (in Sri Lanka + 100%)

direct-electrical waterboiler, heat pump, ventilation and climate control

Power-to-Power + 20 to 40 %

E-Mobility (E-bike, E-roller, E-cars), stationary (storage system)

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 9

9,8 kWp with storage 15kWh capacity

stabilizing the public grid

Dipl. Ing. Hans Urban Schletter GmbH

PV own consumption in household

Example: Solar pioneer Hans Urban

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 10

Active power PV-System.

First use pv-power for direct

consumption of household devices.

Loading of storage on base of

the available surplus pv-power.

Discharge of storage to supply household

whilst cloudy sky and in the evening.

Regulated car charging, adapted

to the available PV surplus.

Additional PV surplus for heating

water by electrical heater.

Grid feed-in or grid requirement is

reduced to a minimum.

Late summer day 28th of August: changing weather day

Dipl. Ing. Hans Urban Schletter GmbH

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 11

Active power PV-System.

First use pv-power for direct

consumption of household devices.

Loading of storage on base of

the available surplus pv-power.

Discharge of storage to supply household

whilst cloudy sky and in the evening.

Regulated car charging, adapted

to the available PV surplus.

Additional PV surplus for heating

water by electrical heater.

Grid feed-in or grid requirement is

reduced to a minimum.Dipl. Ing. Hans Urban Schletter GmbH

Late summer day 28th of August: changing weather day

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 12

0

ct

Components of the electricity price in Germany –

better system integration in cases of PV own-

consumption

www.dgs-franken.de



26.03.2019 | Seite 13

PV own consumption, feed-in tariffand system integration







b) 50 kWp hotel

www.dgs-franken.de



26.03.2019 | Seite 14

own-consumption rate

Financed by own capital

Financed by loan with 8% Interest → expenses: neutral

Payback period <10 years

RoI 6 %

autonomy rate

Example 1:

single-family house

in Colombo

3 kWp for

4500 kWh/a

electricity demand

www.dgs-franken.de



26.03.2019 | Seite 15

Typical daily load profiles

for solar compatible commercial species

Example 2:

Hotel in Colombo

50 kWp for

80.000 kWh

electricity

demand

Annotation:

A storage for the

demand during the

evening or for

power outages

could be considered

In G1: a high electricity demand daily except for the weekend: up to 90% own-consumption

In G2 and G3: 100% own-consumption possible - at the same time 10 to 20% partial autonomy

www.dgs-franken.de



26.03.2019 | Seite 16

Example 2:

Hotel in Colombo

50 kWp for

80.000 kWh

electricity

demand

Annotation:

a storage for the

demand during the

evening and for

peak shaving

could be considered

autonomy rate

own-consumption rate

financed by loan with 8% interest → expenses neutral

20% equity,80% financed by loan with 8% interest, 6 years

payback period , RoI 6%

Financed by own capital, 10 years payback period, RoI 5%

www.dgs-franken.de



26.03.2019 | Seite 17

20.000 GWh PV production/a

= 2018 Sri Lankas

energy consumption

overall x 1,35

(for higher future demand)

Space requirement:

100 square kilometers

covering 17% of the Island

Annotation:

A big challenge but what

is the alternative for a

sustainable independent

economy and strong

climate protection according

to „Paris 2015“ ?

Facilitatorr

Thank you very much for your attentionMichael Vogtmann, DGS e.V.

www.dgs-franken.de



26.03.2019 | Seite 19

Household: 5 kWp, power purchase net 25 Ct/kWh, investment cost 1.400 EUR/kWp, interest on debt 2%/a

Commercial: 65 kWp, power purchase net 19 Ct/kWh, investment cost 1.100 EUR/kWp, interest on debt 2%/a

Industrial: 250 kWp, power purchase net 15 Ct/kWh, investment cost 950 EUR/kWp, interest on debt 2%/a

Quelle: BSW e.V.(Source: BSW Investorguide)

RoI: ca 8%

RoI: ca 11%

Average direct consumption (%)

RoI Industrial RoI Commercial RoI Private Household

EEG 2017: Economics of own-consumption at different

rates(Base: 2% rise of power purchase cost per year, 70% borrowing, 2% loan rate)

www.dgs-franken.de



26.03.2019 | Seite 20

12 years

73.600 €

35.600 €

with reduced EEG

reallocation charge

(40%)

with full EEG

reallocation charge

(100%)

10 years credit

16 years

Comparing 100 kWp concepts:

RoI PV Own Consumption vs. RoI Delivery to a third party

Durchführer

www.dgs-franken.de



26.03.2019 | Seite 21

Quelle: SMA

production

costs 7,5 Ct

Energy Management

Smart Home: „Time Table“ for electrical consumers

Energy consumption

of three devices

production

costs 7,5 Ct

pv own-consumption, feed-in tariff and system …...1 kwp →yield of 1200 –1600 kwh electricity/a...

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