Solar PV systems are already commonplace and affordable in Australia, and battery storage is getting there quickly as well. Increasingly, Australia’s solar homes are looking for ways to maximise the value that solar & storage are able to deliver.
Home energy management systems (sometimes referred to as EMSs or HEMS) are fast becoming a popular way to get the most out of solar panels and batteries. To date, we haven’t seen a side-by-side comparison of the various offerings available in Australia. In the interest of bringing some transparency to this burgeoning market, we’ve reached out to a number of prominent EMS manufacturers for details on their products – and have compiled the results into the table below.
While the list may not be exhaustive, we’re confident that it contains most of the high-profile solutions currently on offer. (And if you see something missing, please firstname.lastname@example.org.)
Also note that all the details included in the table were provided by the manufacturers themselves, so while they be accurate, they have not been independently verified by Solar Choice – we’re taking them at their word.
On a basic level, an EMS does two things:
We’ve used a very loose definition of energy management system for this article; some of the solutions included are primarily monitoring platforms with the potential to be fitted out with control functionality in the future. Some of them are inverters which act primarily as solar & battery managers, while others are full-fledged HEMSs that can function in the absence of solar or batteries; others are bolt-on devices that can be installed alongside a battery bank or on the home’s switchboard.
A helpful glossary of terms used in this table:
Communications protocols & standards – Various ‘smart’ household devices may adhere to or use different communications standards; these standards include
EEBus – A wireless communications protocol for electronic/IoT devices
GSM – A telecommunications standard for mobile devices (allows your EMS to communicate over a wireless network)
Modbus – A wireless communications protocol for electronic devices
RS485 – A wireless communications protocol for electronic devices
ZigBee – A wireless communications protocol for electronic/IoT devices
Z-Wave – A wireless communications protocol for electronic/IoT devices
DRED (Demand response-enabled device) – Devices such as air conditioners and refrigerators with DRED functionality can be remotely and/or automatically controlled to either switch off or use less energy in order to curtail energy consumption during peak pricing periods or when no solar is available.
Internet of Things (IoT) – “the interconnection via the Internet of computing devices embedded in everyday objects, enabling them to send and receive data.”
Peer to peer trading – The ability to sell excess (exported) solar or battery energy to other households. (A ‘moderator’ – usually an electricity retailer – is necessary for peer to peer trading to be possible.)
Spot price trading – The ability to access the wholesale electricity spot market price on the National Electricity Market (NEM) in order to take advantage of high price events (See: Diamond Energy/Reposit Gridcredits).
Tariff arbitrage – Leveraging the difference in TOU billing schedules to maximise energy bill savings
TOU – Time of use billing, where grid electricity costs a different amount depending on the time of day it is used
Virtual power plant – “A virtual power plant (VPP) is a system that integrates several types of power sources, (such as microCHP, wind-turbines, small hydro, photovoltaics, back-up gensets, and batteries) so as to give a reliable overall power supply.”
(click link to see comparison chart on Solar Choice blog)
This table will be updated with more details as we become aware of them, and as new products come onto the Australian market.
This article was originally posted by Solar Choice here.