A 15 kW Three-Phase Sigenergy Upgrade Around an Existing Battery in Mullumbimby
An upgrade built around a battery that was already on site: a new 15 kW three-phase Sigenergy controller for the household’s 32 kWh battery, the old Fronius inverter removed and its panels redirected, the Gateway upgraded to dual-phase, and new AIKO and Trina panels added, in Mullumbimby.
Our own in-house team designed and installed the upgrade in May 2026.
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★★★★★ Rated 5.0 from 60 Google reviews · read them on Google · read them on our reviews page
Not a new system, a better one
This household already had a 32 kWh Sigenergy battery and solar running through an older Fronius inverter. The job was to bring it all together. The Fronius came out, its four strings of panels were redirected into a new 15 kW three-phase SigenStor controller, the Gateway and the cabling to the battery stack were upgraded for dual-phase. New panels went on as well: all-black AIKO panels on the long roof and five more on the pergola roof.
Work list
- Energy controller: a 15 kW three-phase Sigenergy SigenStor controller (the 32 kWh battery was already on site)
- Old Fronius inverter removed; four PV strings redirected to the new controller
- Gateway upgraded to dual-phase, with new cabling to the battery stack
- New solar: all-black AIKO panels (465 W each), plus extra Trina panels on the pergola roof
- Monitoring and app training
A garden roof
The new AIKO panels run in one long, straight line along a narrow metal roof above a rainforest garden and pond. The controller sits under the verandah on top of the existing battery stack.
Upgrades in Mullumbimby
Not every job starts from scratch. Many Mullumbimby homes have older inverters or batteries worth building on. See also shed solar joined into a new 24 kWh battery system and a 9 kWh Sigenergy battery in Mullumbimby.
How every job like this runs
1. Free energy assessment from one or two recent power bills, or a quick phone call on 0483 903 020.
2. Custom design sized from the household’s real usage, with the federal Cheaper Home Batteries rebate and solar STCs taken off at point of sale. We handle the paperwork. See your rebates or try the battery rebate calculator.
3. Face-to-face site visit before install day: compliant battery position, switchboard and RCBO check, and agreement on what stays on in a blackout. No surprises on the day.
4. Install, usually one day, by our own electricians. No subcontractors. Then monitoring set-up, grid connection and a sign-off call.
Warranties
Every new install from us now comes with a 10-year battery warranty, 10-year inverter replacement, 25-year panel performance and our 25-year workmanship warranty on our installation work. Equipment is covered by the manufacturer warranties.
Questions we get asked
Can you upgrade the inverter but keep my battery?
Sometimes, yes. Here the household already had a 32 kWh Sigenergy battery on site; the job gave it a new 15 kW three-phase controller rather than replacing the battery.
What happens to my old string inverter?
On this job the old Fronius inverter came out and its four strings of panels were redirected into the new Sigenergy controller, so all the solar now runs through the battery system.
Why upgrade the Gateway to dual-phase?
The home has more than one phase, so the Gateway and cabling to the battery stack were upgraded to suit. See single-phase vs three-phase.
What happens when the grid goes down?
The Sigenergy Gateway switches the home over to the battery and solar. A typical install backs up the whole home unless you ask us to leave circuits out. See blackout backup batteries.
Thinking about solar and a battery?
We’re based near Mullumbimby and install across the Northern Rivers. See solar and batteries in Mullumbimby and Byron Bay, or compare Sigenergy, GoodWe and Sungrow, Solax and Tesla.
Check Your Battery Rebate & 0% Loan
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★★★★★
Rated 5.0 from 60 Google reviews
✓Local electricians, no subcontractors
✓No obligation, takes 30 seconds
✓25-year workmanship warranty
Get a free energy assessment · or call 0483 903 020
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More from Sun Connect Solar: your rebates; battery rebate calculator; customer reviews; FAQ; recent installs: 6.65 kW solar and 9 kWh Sigenergy battery, Mullumbimby · Solar and a 24 kWh Sigenergy battery, Mullumbimby area · 8.4 kW Jinko solar and 24 kWh Sigenergy battery, Ocean Shores · all recent installs.
