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Hot water with photovoltaics 1
The other way of smart energy storage.
Universal PV hot-water systems
Hot water with photovoltaics 2
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
Hot water with photovoltaics 3
Content
General information about my-PV
Why hot water with photovoltaics?
How does each system work?
Product-details
Hot water with photovoltaics 4
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 )
Hot water with photovoltaics 5
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
Hot water with photovoltaics 6
Why hot water with photovoltaics?
Source: IEA TechnologyRoadmapSolarPhotovoltaicEnergy_2014edition
Hot water with photovoltaics 7
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
Hot water with photovoltaics 8
~ ~~
Autarkic hot water with ELWA
Hot water with photovoltaics 9
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
Hot water with photovoltaics 10
ELWA Stratification Charge
Hot water with photovoltaics 11
ELWA data evaluation
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Sommertage
Frühlingstage
ELWA data evaluation
Hot water with photovoltaics 13
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!
Hot water with photovoltaics 14
Project „Leharweg“ in Styria (Austria)
Hot water with photovoltaics 15
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
Hot water with photovoltaics 16
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?
Hot water with photovoltaics 17
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
Hot water with photovoltaics 18
PV hot water raises the self-consumption ratio
Source: http://www.volker-quaschning.de
Hot water with photovoltaics 19
=~
~ ~~
ca. 4000 kWh
ca. 4000 kWh
AC ELWA – thermal storage of PV excess
Hot water with photovoltaics 20
Hot water with photovoltaics 21
The AC ELWA System
Plug-and-Play: AC ELWA + PLA 3-phase power meter
Hot water with photovoltaics 22
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
Hot water with photovoltaics 23
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
Hot water with photovoltaics 24
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)
Hot water with photovoltaics 25
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)
Hot water with photovoltaics 26
PLA data logger
Hot water with photovoltaics 27
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
Hot water with photovoltaics 28
Decentralized PV hot water in apartment buildings
“Wires instead of pipes“
30 kWp PV
9 apartments
9 AC ELWAs (decentral)
Loxone control
Hot water with photovoltaics 29
Decentralized PV hot water in apartment buildings
Hot water with photovoltaics 30
Decentralized PV hot water in apartment buildings
PV self-consumption 78% Overall solar cover ratio 44% Hot water coverage ratio 86%
Hot water with photovoltaics 31
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
Hot water with photovoltaics 32
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
Hot water with photovoltaics 33
=~
~ ~~
AC ELWA-E: hybrid-storage hot water + battery
Hot water with photovoltaics 34
How hybrid-storage works
Hot water with photovoltaics 35
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
Hot water with photovoltaics 36
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
Hot water with photovoltaics 37
Home-page / status-page
Hot water with photovoltaics 38
AC ELWA-E Web-Interface / Day Chart
Hot water with photovoltaics 39
Setup
Hot water with photovoltaics 40
Setup
Hot water with photovoltaics 41
Compatible systems List continues to grow!
Quick start guides available soon!
Hot water with photovoltaics 42
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
Hot water with photovoltaics 43
=
=
~
~
~ ~~
AC ELWA-F off grid usage of PV excess energy
Hot water with photovoltaics 44
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
Hot water with photovoltaics 45
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)
Hot water with photovoltaics 46
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)
Hot water with photovoltaics 47
Ybbstalerhütte (mountain shelter - Austria)
Hot water with photovoltaics 48
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!
Hot water with photovoltaics 49
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
Hot water with photovoltaics 50
References
Hot water with photovoltaics 51
Reinhard Hofstaetter
International Sales
+43 699 136 30 780
www.my-pv.com
© my-PV GmbH
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