Inverters

Sigenergy SigenStor EC SP

Name: Sigenergy SigenStor EC SP
Brand: Sigenergy

3–6 kW · best for solar, battery and backup in one system

8.0Very good#38 of 59 inverter series we rank · EnergyUpgrade Score out of 10

4.9 out of 5 from 1,395 owner reviews of Sigenergy inverters

Type: All-in-one
Phase: Single phase
Efficiency: 98.0%

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Why it scores 8.0.

Each part comes from the datasheet with a published rule; anything not stated scores zero.

How we rate inverters

Efficiency
6.7 · 30%
Every point of efficiency is solar you keep, every day for 10+ years.
Rule: Maximum efficiency on the datasheet: 96% scores 0, 99% scores 10.
MPPTs for split roofs
5.0 · 20%
Each MPPT runs one roof face independently, so east and west panels don't drag each other down.
Rule: Number of MPPT trackers: 1 scores 0, 2 scores 5, 3 or more scores 10.
Heat tolerance
10.0 · 20%
Inverters on hot walls throttle or fail early. A higher operating limit means more headroom.
Rule: Highest operating temperature: 45°C scores 0, 60°C scores 10.
Room for more panels
10.0 · 15%
How much panel capacity the inverter accepts, so you can oversize for winter and cloudy days.
Rule: Maximum PV input divided by rated AC output: 1.2x scores 0, 1.5x or more scores 10. Rebate rules allow panels up to 133% of the inverter, so more than 150% adds little.
Weather sealing
10.0 · 15%
Most Australian inverters live outdoors.
Rule: IP66 or better scores 10, IP65 9, IP55 4, lower 0.

Full specifications.

168 approved models · Australian datasheet

Sizes: 3–6 kW
Type: All-in-one
Phase: Single phase
Takes a battery: Yes
Maximum efficiency: 98%
European weighted efficiency: 97.4%
Panel headroom (max PV ÷ rated AC): 200%
MPPT trackers: 2
Backup output: Peak output power (10 seconds): 2 times of nominal output power
IP rating: IP66
Highest operating temperature: 60°C
Cooling: Natural convection
Weight: 18 kg
Compatible batteries: SigenStor BAT series, 1 ~ 6 modules per controller

About the brand

Sigenergy inverters

Excellent, modern hardware that installers rate highly. It's a young company and had a recall in 2025, handled with replacements, so the track record is still building.

Read the Sigenergy review

7.5

Brand rating#4 of 9 brands for inverters