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Resi-BESS
Testing and Trials
Michelle Taylor
Ergon Energy May 2016
Residential Battery Energy Storage Systems
• Industry survey – March 2014 and again May 2016
• Product selection
• Lab testing
• Field deployment
• Results
Funding for this work has been provided by The Department of Energy and Water
Supply, Queensland Government
Industry survey
3
• 2014 - About 40 manufacturers bringing or intending to
bring in specific resi-BESS product to Australia
• 2016 – Over 70 manufacturers bringing or intending to
bring in specific resi-BESS product to Australia
• Includes Multiple Mode Inverters, packaged batteries,
packaged systems but not build compilations in general
• Understanding of products operation has increased
• Local support has increased
• Lots of changes in the market and in the product over
the time frame
• Lots of planned evolution of product
Product Selection
4
• Up to 10kVA/30kWh single phase or 30kVA/50kWh
three phase
• High level of control enablement
• Some form of remote access
• Back-up function
• At first we only looked for fully packaged systems
• As the systems needed to respond to a series of tariff
scenarios, higher levels of control were sought.
• None appeared to have all aspects covered
• Started with 3 products – now this has increased
considerably
Lab Testing
5
• Installation assessment
• Review of safety in relation to device/s – general
aspects and where available standards conformance
• General functional tests
• Operation under tariff scenarios
• Operation in end states – ie states where BESS could
not complete assigned task due to lack of battery
capacity (either as a load or a source) within command
Field Deployment
6
• 11 units installed in a residential location in 10 houses
with 4 blocks of testing over a period of 1 year
• Each homeowner was also given an Energy Monitoring
Device which provided very rich level of information
• Solar shifting, time of use, time of use demand and
capacity tariff concepts were trialled
• Customers were heavily engaged for feedback
Results – Lab Testing
7
Compliance issues – earthing, labelling, insulation, trip times
Installation assessment – some very straightforward to install, some needed a lot of extras (this is before you get to considering the state of the customer’s switchboard)
Operational assessment – the manuals left wanting for providing a good understanding of what the systems were able to do, and likely to do
- the systems generally performed consistently but in some cases this was even in contravention to what the manufacturers had noted in their manuals
- all systems were controlled via time clock and some had the additive of state of charge controls – at the time of lab testing, none actually enabled operational controls based on the energy monitoring of the installation (which was provided in various forms across the products)
- there was no consistency in terminology of operation
- the way in which systems were programmed was diverse
- the connectivity for monitoring and in some cases control was also diverse
- accuracy of system data was poor on some systems
8
Testing in the Lab
Operational Development
9
Results – Field Trials
10
• Only 3 of the 11 systems did not have issues that resulted in failure or
inconvenience to the customer over the period of 12 months
• System failures included inverter, BMS, battery management module,
communications, on board circuit breakers
• Support for repair of systems took up to 8 weeks (system offline) and local
industry personnel were only able to provide very limited support, support
came from Brisbane, Perth, Adelaide, Melbourne and China
• There were some upgrades in operational firmware whilst in the field
• There were some in correct programming errors we made whilst the units
were in the field
• Correct installation with essential circuits separated and with the
installation of circuit monitoring required substantial work for brownfield
installations
• The cost of the system did not correlate at all to the reliability or to the
manufacturer’s desire/ability to resolve failures, or to the level of control-
ability of the systems.
Results – Field Trial – from the customer’s perspective
11
• Due to some power cycling caused by interaction between the HEMS and
the BESS, and possibly other reasons, there were 4 appliance failures on
the trial that could have been attributed to the project
• All systems were installed outside on verandahs or carports, or in garages
and utility rooms (not habitable rooms)
• Customers lost interest in most cases in how the systems operated and did
not want to understand the details
• Customers wanted set and forget functions
• Having a user interface that is understand-able at a glance but does not
require a manual to interpret is important (apps are useful but not when
things go wrong)
12
13
Outage Management
Figure 11: BESS and PV performance during outage
14
Wiring challenges
15
Some installed systems
16
System installation
17
System installation
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