APPLICATION GUIDE FOR
AC DAISY CHAINING OPTION
Proper sizing of fuses and cables when using AC Daisy Chaining
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Application Guide for AC Daisy Chaining option
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© Fronius International GmbH
Version V1.0 May/2021 Peter Schmidhuber, Jasmin Gross
Solar Energy
Fronius reserves all rights, in particular rights of reproduction, distribution and translation. No part of this document may be reproduced,
in any form whatsoever, or stored, processed, duplicated or disseminated with the aid of electronic systems, without the written consent
of Fronius. You are hereby reminded that the information published in this document, despite the greatest care being exercised in its
preparation, is subject to change and that neither the author nor Fronius can accept any legal liability. Gender-specific wording refers
equally to the male and female form
.
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Application Guide for AC Daisy Chaining option
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INDEX
1 Introduction .....................................................................................................................................4
2 AC Daisy Chaining option ..............................................................................................................5
2.1 What is AC Daisy Chaining? .............................................................................................................5
3 Right application of AC Daisy Chaining .......................................................................................6
3.1 AC Daisy Chaining with Tauro ..........................................................................................................6
3.2 Fuse sizes .........................................................................................................................................6
3.3 Current carrying capacity when cable is buried ................................................................................7
3.3.1 200kW Daisy Chain ..........................................................................................................................7
3.3.2 150kW Daisy Chain ..........................................................................................................................8
3.3.3 100kW Daisy Chain ..........................................................................................................................8
3.4 Current carrying capacity for cables above ground ..........................................................................9
3.4.1 200kW Daisy Chain ..........................................................................................................................9
3.4.2 150kW Daisy Chain ..........................................................................................................................9
3.4.3 100kW Daisy Chain ....................................................................................................................... 10
4 AC Daisy Chaining with SnapInverter ....................................................................................... 11
4.1 Fusing and installation ................................................................................................................... 11
4.2 Example ......................................................................................................................................... 12
4.2.1 20 kW Symo with Tauro ECO 100-3-D .......................................................................................... 12
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Application Guide for AC Daisy Chaining option
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1 INTRODUCTION
This paper deals with the new AC Daisy Chaining option, which can be used in combination with the Fronius
Tauro commercial inverter series.
In the following chapters, you will be given an insight into the innovative design options as well as important
safety information that will help you to design and choose the right cabling. In addition, practical examples
with different system sizes will help you understand the AC Daisy Chaining option in detail.
Furthermore, the combination of SnapINverters and Tauro in connection with AC Daisy Chaining is also
explained.
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