AS/NZS 5033:2021 Max Short Circuit Current Of PV Modules & Inverters
COMPLIANCE UPDATES FROM OUR TECHNICAL TEAM
From 19 May 2022, Solar PV installations nationwide need to comply with AS/NZS 5033:2021. An issue was identified in this standard that affects some high current solar modules when paired with popular inverters.
Supply Partners responsibly moved to discuss this potential issue with the Smart Energy Council and electrical bodies associated with Standards in Australia specifically regarding this potential issue.
The problematic clause is 184.108.40.206 which states “The current rating of the PV input of the PCE (Isc PV) shall be at least the current rating of the circuit they will be fitted to according to Clause 4.2.2”
Clause 4.2.2 outlines various calculations to determine the current of circuits, however the most relevant calculation would be for a PV string with no overcurrent protection or DCU’s connected. Istring max = 1.25 x KI x Isc MOD.
Therefore, if you were using a Monofacial PV module with an Isc of 12.28A you would need to multiply by 1.25x to attain the maximum string current of 15.35A. When making your inverter selection, the inverters maximum short circuit current would need to be higher than this value.
This requirement has proven problematic due to the mismatch between new higher current modules in the market and a large portion of existing inverters. Supply Partners aims to support our industry by providing rolling updates from industry bodies and manufacturers regarding this issue while it unfolds.
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* The information below is intended for guidance purposes only. While Supply Partners has consulted with various organisations in preparing the below summary, we do not warrant that the information given is complete and error-free. We recommend that installers undertake their own enquiries based on their own business circumstances, including verifying this information with the appropriate regulators.
INVITE TO ALL INVERTER MANUFACTURERS IN AUSTRALIA
We're inviting all manufacturers who offer Inverters in Australia to send through their statements or updates regarding 'AS/NZS 5033:2021 - Max Short Circuit Current Of PV Modules & Inverters' and we will publish it on this page. Even if it is from a brand that we don't distribute, we will share it as we want to include as much helpful information as possible. Please email your statement to firstname.lastname@example.org or call 0428938255.
Updates from Industry Bodies
27/05/2022 - Smart Energy Council - Industry Update: Solar PV Array Design Resolution. Email from John Grimes.
27/05/2022 - Clean Energy Council - Interpretation of AS/NZS 5033:2021 : Selection of inverters and PV panels - Email to Database
The Clean Energy Council have sent an email to their database regarding Interpretation of AS/NZS 5033:2021 : Selection of inverters and PV panels. Please read the email for full details.
Updates from Manufacturers
30/09/22 - SUNGROW INVERTER Max. PV Short-circuit Current (Isc) Update 30th September 2022 Bulletin
Sungrow have emailed out an updated bulletin regarding Max. PV Short-circuit Current (Isc) and their inverter range. Please see the statement for full details.
01/07/22 - Statement from Fronius regarding Fronius Inverters - PV ISC Input Rating Safety Factor - AS/NZS 5033:2021
13/07/22 - Statement from Delta regarding Higher Short Circuit Current Testing on their range of Inverters - AS/NZS 5033:2021
06/07/22 - Statement from FIMER regarding Higher Short Circuit Current Testing on their range of Inverters - AS/NZS 5033:2021
06/06/22 - Statement from Sungrow regarding Higher Short Circuit Current Testing on their range of Inverters - AS/NZS 5033:2021
06/06/22 - Statement from SMA regarding AS/NZS 5033:2021
SMA have emailed out a link with the following information:
"With the new AS/NZS 5033:2021 now mandatory, there has been much talk and confusion in the industry about PV array short circuit currents and how they relate to inverter MPPT DC input ratings. SMA inverters are engineered for the toughest conditions and come with one of the largest MPPT short circuit ratios on the market making them compatible with the majority of modules.
Please see the link below to view array current calculations for SMA inverters in accordance with the updated standard, AS/NZS 5033:2021.
If you have any further questions, please contact our Service & Support team for further assistance." Please see the webapge for full details.
27/05/22 - Statement from GoodWe regarding Higher Short Circuit Current Testing on their range of Inverters - AS/NZS 5033:2021
GoodWe Country Manager Dean Williamson has have provided a statement to confirm higher testing levels on their Australian range. Please see the statement for full details.
30/05/22 - Statement from Sunways regarding Compliance with AS/NZS 5033:2021
Sunways has provided a statement to confirm "Sunways inverters have a max short circuit input current of 20A per Inputs which means you can confidently install Sunways inverters to pair with most of the current or future mainstream solar modules power class and safely meet the AS/NZS5033:2021 standards." Please see the statement for full details.
27/05/22 - Statement from Solar Edge regarding Compliance with AS/NZS 5033:2021
Solar Edge has provided an application note which sets out to provide clarification of the practical application of AS/NZS 5033:2021 and how it relates to SolarEdge products. Please see the statement for full details.
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