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Hot water with photovoltaics 1

The other way of smart energy storage.

Universal PV hot-water systems

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Speakers

Ing. Dr. Gerhard Rimpler, CEO 20 years of experience in the solar industry Developer solar electronics at Fronius Founder Phocos AG CEO Sunmaster – Solar thermal Collectors Founder my-PV Board of directors Ökostrom AG Chairman "Austria Solar Innovation Center“ (ASIC)

Ing. Reinhard Hofstätter MSc, International Sales Manager 2010-2016 Researcher at Austria Solar Innovation Center“ (ASIC)

Subject areas: R&D solar heat, Project- and quality management

Focus: energy efficiency, optimisation of energy systems Lecturer: Upper Austria University of Applied Sciences, Eco-Energy Technology

Since July 2016 International Sales Manager my-PV

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Content

General information about my-PV

Why hot water with photovoltaics?

How does each system work?

Product-details

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Facts and figures

Located in Upper Austria (near Steyr)

Milestones • 2011 Founded as PV system vendor, Single line Distributor Trina Solar

• 2012 Research project „Utility scale storage“ with Younicos

• 2013 Development of „ELWA“, Single line Distributor Sungrow

• 2014 Product Launch ELWA

• 2015 Termination of the distribution activities, concentration on „hot water with photovoltaics“ Product Launch AC ELWA, AC ELWA-I

• 2016 Product Launch AC ELWA-E, AC ELWA-F, Partnerships with a number of well known companies (inverter/battery/EMS/Smarthome manufacturers )

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off-grid grid-connected

Without storage battery

With storage battery

AC-ELWA AC ELWA-I ELWA

AC-ELWA-F AC-ELWA-E

Universal PV hot-water systems

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Why hot water with photovoltaics?

Source: IEA TechnologyRoadmapSolarPhotovoltaicEnergy_2014edition

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off-grid grid-connected

Without storage battery

With storage battery

AC-ELWA AC ELWA-I ELWA

AC-ELWA-F AC-ELWA-E

Universal PV hot-water systems

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~ ~~

Autarkic hot water with ELWA

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Characteristics

Immersion heater with temperature- controlled DC converter and MPP-tracker

PV-sided • 0-2.000 W / 6-8 standard panels in series, MC4

• 2 W internal consumption

Grid-sided • 1.675 W

• automatic backup in the afternoon

Target temperature-setting with adjusting knob

Many more details

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ELWA Stratification Charge

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ELWA data evaluation

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Sommertage

Frühlingstage

ELWA data evaluation

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4 storey apartment building

24 apartments

District heating

Water heating decoupled from space heating

140 L decentral hot water boilers „Enerboxx“

24 ELWAs with 1,5 kWp each

Project „Leharweg“ in Styria (Austria)

Detailed description available!

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Project „Leharweg“ in Styria (Austria)

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FAQ´s

How is a PV hot water system to be dimensioned? Advisable is approx.

50% solar fraction

Demand approx. 50L/day, person + approx. 20% thermal losses (storage, piping, …) rule of thumb 1.000 kWh/year, person

annual return PV approx. 1.100 kWh/kWp, year (Austria) approx. 7% excess rule of thumb 1.000 kWh/kWp, year

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FAQ´s

Which panels can be connected with ELWA? • All established poly, mono und thin-film PV modules

• Consider voltages and currents!

Is the installation of ELWA in the boiler complicated? • http://www.my-pv.com/autarkes-warmwasser/videos-elwa.html

Solar heat systems have a coefficient of 80%, photovoltaics only 15%? • Real annual return collector 350 kWh/m², PV panel 175 kWh/m²

> required space 2x solar heat collectors

What happens when there is a blackout? • The system continues working!

What happens to the excess?

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off-grid grid-connected

Without storage battery

With storage battery

AC-ELWA AC ELWA-I ELWA

AC-ELWA-F AC-ELWA-E

Universal PV hot-water systems

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PV hot water raises the self-consumption ratio

Source: http://www.volker-quaschning.de

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=~

~ ~~

ca. 4000 kWh

ca. 4000 kWh

AC ELWA – thermal storage of PV excess

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The AC ELWA System

Plug-and-Play: AC ELWA + PLA 3-phase power meter

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The AC ELWA System

Plug-and-Play: AC ELWA + PLA 3-phase power meter

Extern-control: AC ELWA-I + Universal Interface 0–10 V signal

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AC ELWA mechanical data

Immersion heater 47 cm with 3 heating-elements

Non-heating zone 9 cm

1,5 inch standard connection thread

glass-fibre reinforced plastic head: fits for all boiler materials, thermal insulation

Weight: 2 kg, compact design

Installation in storage tanks and hot water boilers possible

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AC ELWA electrical data

0-3.000 W linear power controlled

Single phase grid-connection, 2,8 m power cable

Sinusoidal current consumption => no thyristor!

TAB und TAEV compliant (Austria, Germany, Switzerland)

16 A / 13 A protection fuse

Backup heating possible (hot water indemnification)

ELWA Link single-wire communication can be installed beside normal cable routing AC ELWA has a 2-pol plug (with shorting link)

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PLA technical data

3-phase power meter: determines the excess power

Controls up to 6 AC ELWAs

3x400 V + N, 63 A nominal current

Connection for ELWA Link

Top hat rail installation, 4 DU, division units

Display operating condition of AC ELWA

Data logger integrated (download via IR-interface)

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PLA data logger

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PLA factory setting

Stratification charge Synchronic charge (standard)

Factory setting: Boost-Backup deactivated (hot water indemnification)

AC ELWA 2

AC ELWA 1 Exce

ss-p

ow

er

AC ELWA 2

AC ELWA 1 Exce

ss-p

ow

er

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Decentralized PV hot water in apartment buildings

“Wires instead of pipes“

30 kWp PV

9 apartments

9 AC ELWAs (decentral)

Loxone control

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Decentralized PV hot water in apartment buildings

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Decentralized PV hot water in apartment buildings

PV self-consumption 78% Overall solar cover ratio 44% Hot water coverage ratio 86%

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Tips and tricks

Boiler-drain not indispensable see video http://www.my-pv.com/autarkes-warmwasser/videos-elwa.html

PLA settings LEDs covering see video http://www.my-pv.com/warmwasser-solarstrom/videos-ac-elwa.html

PLA settings Backup / Time http://www.my-pv.com/warmwasser-solarstrom/videos-ac-elwa.html

Further information see www.my-pv.com

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off-grid grid-connected

Without storage battery

With storage battery

AC-ELWA AC ELWA-I ELWA

AC-ELWA-F AC-ELWA-E

Universal PV hot-water systems

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=~

~ ~~

AC ELWA-E: hybrid-storage hot water + battery

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How hybrid-storage works

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AC ELWA-E

AC ELWA-E communicates with a battery / energy-management-system and identifies if the excess power is from the PV or the battery

Superordinate control via battery-storage or EMS > battery has priority

Rj45 interface / Modbus TCP

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Setup

With Router

• AC ELWA-E gets dynamic IP address from Router

• Search AC ELWA-E with scanner-program

• DoubleClick on entry > Web Setup

• or search AC ELWA in the DHCP-list on router

Without router

• Connect AC ELWA-E in setup mode directly with laptop

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Home-page / status-page

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AC ELWA-E Web-Interface / Day Chart

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Setup

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Setup

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Compatible systems List continues to grow!

Quick start guides available soon!

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off-grid grid-connected

Without storage battery

With storage battery

AC-ELWA AC ELWA-I ELWA

AC-ELWA-F AC-ELWA-E

Universal PV hot-water systems

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=

=

~

~

~ ~~

AC ELWA-F off grid usage of PV excess energy

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AC ELWA-F

Designed for frequency-shift battery inverters

Plug into socket, ready!

Identifies the energy flow

• Before the PV inverter shuts down because of the fully charged battery, the energy is used for hot water heating

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Working principle

PAC [%]

FAC [Hz]+1 +2 +3-1-2-3 f0

50

100

FAC-Start Delta (1Hz)

FAC-Limit Delta (2Hz)

+4

FAC-Delta+ (4,5Hz)

-4

FAC-Delta- (4,5Hz)

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Working principle

PAC [%]

FAC [Hz]+1 +2 +3-1-2-3 f0

50

100

FAC-Start Delta (1Hz)

FAC-Limit Delta (2Hz)

+4

FAC-Delta+ (4,5Hz)

-4

FAC-Delta- (4,5Hz)

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Ybbstalerhütte (mountain shelter - Austria)

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Innkeeper: “Finally, when I arrive on Fridays, the water is already hot without heating the wood stove!”

1.343 meters above sea level

1.000 mountaineers are accommodated per year

4,3 kWp PV

18,5 kWh battery

300 litre boiler = doubling of the storage capacities at low investments

Pile of wood remains for cooking and space heating!

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Summary

my-PV is specialised on hot water/heating with photovoltaics

my-PV offers grid compliant solutions

Different solutions/products with open interfaces

Water is our storage medium

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References

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Reinhard Hofstaetter

International Sales

reinhard.hofstaetter@my-pv.com

+43 699 136 30 780

www.my-pv.com

© my-PV GmbH

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