For Perth homeowners comparing battery backup options, the Sungrow SHRS and SHRT series stand out in one important way: the three-phase SHRT is one of the few systems that can deliver whole home backup on a three-phase property at the right inverter size. That makes Sungrow a strong contender for Perth’s many three-phase homes where backup power is a priority.
This guide covers what each Sungrow system backs up across single-phase and three-phase configurations, what to avoid running during an outage, and how the SHRS and SHRT series differ. Positive Energy Solutions installs Sungrow SHRS and SHRT systems across the Perth metropolitan area.
SHRS vs SHRT: Understanding the Difference
Sungrow uses two product lines for residential installations:
- Sungrow SHRS — single-phase hybrid inverter. Designed for homes on single-phase power. Paired with compatible Sungrow battery storage.
- Sungrow SHRT — three-phase hybrid inverter. Designed specifically for three-phase properties. Delivers meaningfully different backup capability compared to single-phase systems from other brands.
The inverter series determines backup capability. Positive Energy Solutions installs the SHRS in 5kW and 10kW single-phase configurations, and the SHRT in 5kW, 10kW, and 15kW three-phase configurations.
Single-Phase Backup: Sungrow SHRS
SHRS 5kW — Essential Circuit Backup
The 5kW SHRS backs up two essential circuits during a grid outage. Your installer identifies the right circuits during system design — typically lights, the refrigerator, and key power points. High-draw appliances are not available in this configuration.
For homeowners who want solid essential circuit protection on a single-phase property, the 5kW SHRS is a cost-effective and reliable option.
SHRS 10kW — Whole Home Backup
The 10kW SHRS backs up your entire home during an outage — every circuit is live. This is the configuration for single-phase homeowners who want zero compromise when the grid goes down.
Load management: Even with whole home backup, avoid running multiple high-draw appliances at the same time during an outage. Air conditioning, electric cooktop, EV charger, and pool pump running simultaneously can overload the system. Prioritise what you need and let solar generation carry the load during the day.
Appliances not recommended to run simultaneously during an outage:
- Air conditioning (particularly large ducted systems)
- Electric cooktop or oven
- EV charger
- Pool pump
Three-Phase Backup: Sungrow SHRT
The Sungrow SHRT is purpose-built for three-phase homes, and its backup capability scales meaningfully with inverter size — including whole home backup at 15kW. This is a genuine differentiator for Perth’s three-phase households.
SHRT 5kW — Not Recommended for Backup
At 5kW across three phases, the SHRT delivers only 1.66kW per phase. This is insufficient to maintain stable operation during a grid outage — the system is prone to tripping in backup mode under normal household loads. Positive Energy Solutions does not recommend the SHRT 5kW as a backup solution. If backup is a priority on a three-phase property, the 10kW or 15kW SHRT is the appropriate choice.
SHRT 10kW — Three Essential Circuits
The 10kW SHRT backs up three essential circuits during an outage — one per phase. This gives three-phase homeowners reliable protection across the whole property for their most important circuits: lights, refrigerator, key power points. It is a strong middle-ground option for three-phase homes where essential circuit coverage is sufficient.
SHRT 15kW — Whole Home Backup on Three-Phase
The 15kW SHRT is the standout option for three-phase Perth homes. It delivers whole home backup — every circuit live during an outage — making it one of the only residential battery systems available in Perth that achieves full three-phase whole home protection.
For three-phase homeowners who run air conditioning, have high energy consumption, or simply want complete peace of mind during outages, the 15kW SHRT paired with adequate battery storage is the system to consider.
Same load management rules apply at 15kW whole home: avoid stacking air conditioning, EV charger, cooktop, and pool pump simultaneously during an outage. With solar generating during the day, the system handles significant loads comfortably — but simultaneous heavy loads can still cause issues.
What Can You Run During an Outage?
Monitor Your System During an Outage: iSolarCloud App
The Sungrow iSolarCloud app gives you real-time visibility of your SHRS or SHRT system during a grid outage — battery state of charge, live solar generation, home consumption, and estimated backup duration at current usage. This is your most important tool for managing loads during an outage.
If the battery is drawing down faster than solar is charging it, reduce load by switching off a high-draw appliance. On a sunny Perth day, the app will show available headroom so you can make confident decisions about what to run. Active monitoring through iSolarCloud is the safest way to maintain stable backup power and avoid the system tripping under excessive load.
Rebates and VPP Eligibility
Sungrow SHRS and SHRT systems paired with compatible Sungrow battery storage are eligible for both the Federal Cheaper Home Batteries Program and the WA Residential Battery Scheme ($1,300 for Synergy customers). Eligible configurations on the WA Sustainable Systems List also qualify for Virtual Power Plant (VPP) programmes.
Speak to a Positive Energy Solutions consultant to confirm current eligibility and the rebate amounts that apply to your system size and configuration.
Why Positive Energy Solutions Installs Sungrow SHRS and SHRT
The Sungrow SHRS and SHRT series cover more backup scenarios than almost any other brand Positive Energy Solutions installs — from essential circuit protection on single-phase through to whole home backup on three-phase. The SHRT 15kW’s ability to deliver full three-phase whole home backup is a capability most competitors simply cannot match at the residential level.
For single-phase homes, the SHRS 10kW whole home option is a proven, cost-competitive choice. For three-phase homes where backup is a genuine priority, the SHRT series — particularly at 15kW — is one of the strongest options available in Perth.
Our team manages the full installation: system design, Western Power network application, rebate paperwork, and commissioning.
Talk to Positive Energy Solutions
If you are considering a Sungrow SHRS or SHRT system with backup capability, our team can assess your home, recommend the right inverter size, and confirm the rebate position.
Call us on 1300 180 999 or complete our online enquiry form and we will be in touch within one business day.
Related guides
- Fronius GEN24 PLUS Backup Power for Perth Homes
- SigEnergy SigenStor Backup Power for Perth Homes
- Tesla Powerwall 3 Backup Power for Perth Homes
- What Happens to Your Solar in a Blackout? A Perth Homeowner's Guide
Frequently Asked Questions
What is the difference between the Sungrow SHRS and SHRT?
The SHRS is a single-phase hybrid inverter; the SHRT is a three-phase hybrid inverter. If your home is on single-phase power, you need the SHRS. If your home is three-phase, you need the SHRT. The SHRT offers a wider range of backup options — including whole home backup at 15kW — making it particularly suited to three-phase Perth homes where backup power is important.
Can the Sungrow SHRT 5kW provide backup on a three-phase home?
No. At 5kW across three phases, the output is only 1.66kW per phase — not enough to maintain stable backup under normal household loads. The system is prone to tripping. If backup is a priority on a three-phase property, the 10kW or 15kW SHRT is the right choice.
Is the Sungrow SHRT 15kW the only way to get whole home backup on three-phase?
It is one of the very few residential options available in Perth that delivers genuine whole home backup on a three-phase property. Most battery systems can only offer essential circuit backup on three-phase. The SHRT 15kW is a key reason Sungrow is a strong recommendation for three-phase Perth homes with serious backup requirements.
How long will the system run during an outage?
Duration depends on your battery capacity, what you are running, and how much solar is generating. During daylight hours with solar charging the battery and powering your circuits simultaneously, the system can sustain backup through extended outages with sensible load management. At night, duration depends on your battery’s state of charge.
Are Sungrow systems eligible for WA rebates?
Yes. Sungrow SHRS and SHRT systems with compatible batteries qualify for the Federal Cheaper Home Batteries Program and, for eligible configurations on the Sustainable Systems List, the WA Residential Battery Scheme and VPP programmes. A Positive Energy Solutions consultant will confirm exactly what applies to your system at quote stage.
Does Positive Energy Solutions install Sungrow across all of Perth?
Yes. We install Sungrow SHRS and SHRT systems across the Perth metropolitan area and surrounds. Contact us to confirm coverage for your location.
About the Author
Jason Wiktorowicz
Sales Manager, Positive Energy Solutions | Perth, WA
Jason has been at the centre of Western Australia’s energy transition for over a decade. As Orchestration Lead on Project Symphony — WA’s largest virtual power plant pilot — and Stream Lead on Project Encore, he worked directly with AEMO, Western Power and Energy Policy WA to shape how distributed energy resources connect and operate on the SWIS. That work included developing and rolling out CSIP-AUS, now mandatory for all new WA grid connections. He also led Emergency Solar Management (ESM), the first program of its kind in WA, VPP for Schools (VPP4S), which provided direct market benefits through Supplementary Reserve Capacity, and REBAR, the WA Residential Battery Rebate scheme.
His earlier career spanned Synergy, Infinite Energy and Curtin University’s Sustainability Policy Institute, where he co-authored peer-reviewed research on net-zero urban precincts, solar integration and peer-to-peer energy trading, published in the journal Urban Planning in 2018.
At Positive Energy Solutions, Jason leads sales with a focus on system design accuracy and long-term performance. Positive Energy Solutions installs solar and battery systems, EV chargers and heat pumps, and holds partner accreditations with Fronius, SigEnergy, iStore and SunPower. Connect with him on LinkedIn.
