What a SigenStor actually is — explained properly.

The 30-second take

• One SigenStor tower contains a hybrid solar inverter, stackable battery modules, backup switching, energy management — and optionally a DC EV fast charger.
• Battery modules of roughly 5–10 kWh stack to 48 kWh in a single tower; single-phase controllers come in 8/10/12 kW, with three-phase options.
• Backup behaves like a UPS: near-instant claimed switchover, with a reserve level you set in the mySigen app before storms.
• Most Australian homes land at 10–16 kWh; the federal rebate’s full rate ends at 14 kWh, which pulls the value maths toward that zone.
• Modularity means design decisions — which is why who designs and installs your stack matters as much as the stack.

The 5-in-1 idea, translated

A conventional solar-plus-battery install is a small ecosystem of boxes: solar inverter, battery, battery inverter or hybrid, backup gateway, maybe an EV charger — often from different brands, each with its own warranty and app. The SigenStor collapses that into one stacked tower on one wall plate: energy controller (the inverter brain) on top, battery modules beneath it, all sharing one DC bus, one app and one warranty.

The practical wins are fewer conversion losses (Sigenergy claims up to 98.4% round-trip on the DC path), fewer trade coordination problems at install time, and a cleaner wall. The trade-off is commitment: you’re buying into one brand’s ecosystem — which is why the brand-trust question deserves its own read.

How the modular stack works

• The controller sets the ceiling. Single-phase energy controllers come in 8, 10 and 12 kW; three-phase options serve bigger homes. This is the box the November 2025 recall touched (single-phase units sold Mar–Nov 2025 — since remedied with replacement plugs).
• Modules set the storage. Battery modules of roughly 5–10 kWh each stack beneath the controller — up to 48 kWh in one tower.
• You can grow later. Start at 10–16 kWh and add a module when an EV arrives, instead of buying a second complete system.
• The EV module is a stack citizen too. The 12.5/25 kW DC charging module slots into the same tower — covered in our EV guide.
• IP66 enclosure. Rated for genuine outdoor mounting — garage walls are not mandatory.

Blackouts, the app, and the settings that matter

In an outage the SigenStor switches to backup power near-instantly — fast enough that computers and Wi-Fi typically ride through. What stays on depends on how your installer designed the backup circuit: whole-home on a modest battery is a fantasy the good installers will talk you out of.

The mySigen app tracks generation, storage and consumption in real time, and holds the setting most owners discover too late: Backup Reserve. Before a forecast storm, raising the reserve toward 100% keeps the battery full for the outage instead of trading it into the evening peak.

“Whole-home backup on a modest battery is a fantasy — the good installers design an essential-loads circuit and tell you honestly what stays on. That conversation is a quality signal.”

Sizing one for an Australian home

Evening usage decides it. A typical grid-connected home drawing 16–20 kWh per day with solar usually banks most value from 10–16 kWh of storage — enough to carry the evening peak and overnight base load. The federal rebate’s full rate ending at 14 kWh pulls the economics toward that zone too.

Three-phase homes, pool pumps, ducted air and EV charging shift the answer upward — that’s a design conversation, and our system-size guide gives you the framework to sanity-check any quote’s proposal.

Read next

• System size guide — the sizing framework
• The Sigenergy EV charging module explained
• Sigenergy review: strengths and caveats

Sources

Every quantitative claim on this page traces to one of the sources below — government, manufacturer, or independent AU industry reference. Last verified 2026-08-11.

• sigenergy.com — SigenStor product page
• gridly.com.au — SigenStor specs
• springers.com.au — blackout app settings