Sigenergy SigenStor: 5, 8, 10 or 12 kW?

The short answer, before the tables.

The inverter size is set by your solar array and your phase supply, not by your battery. Every SigenStor Energy Controller from 5.0 to 12.0 takes the same battery modules and stacks the same one to six of them, so picking a bigger inverter does not buy you more storage — it buys you more solar input and more output power.

If you are on single-phase and want the standard 5 kW export approval most Australian networks grant without extra paperwork, the 5.0 SP is the one. If you have a large array, the 8.0 SP and above give you more MPPT channels to run more roof orientations. And if you are on three-phase, you are choosing from an entirely different product — the Sigen Hybrid TP2 — which shares the name but not the electrical design.

There is an active recall on three of these models.

Recall PRA 2025/20703, published 19 November 2025, covers SigenStor EC 8.0, 10.0 and 12.0 kW SP AU single-phase energy controllers fitted with quick-connect AC plugs, sold between 4 March and 18 November 2025. The AC plug may overheat and become damaged, posing a fire risk. No property damage or injuries were reported at publication.

Three-phase units are not included. Neither is the 5.0 or 6.0 SP. Units sold after 18 November 2025 are outside the recall dates.

The remedy is an interim firmware update followed by a free replacement unit with a redesigned AC plug, plus an extra two years of warranty. Your retailer or Sigenergy arranges it — sigenservice.au@sigenergy.com.

We are naming this on a page that recommends those exact models because you should hear it from us before you hear it from a competitor. It does not make the 8.0, 10.0 or 12.0 a bad choice today — a recall that is being fixed properly, with an extended warranty attached, tells you more about a manufacturer than one that never happens. Our full recalls and warnings checklist tracks this one alongside every other current Australian battery recall.

These are two different products wearing one name.

This is the distinction most buyers miss. The single-phase unit is a SigenStor Energy Controller (SP). The three-phase unit is a Sigen Hybrid (TP2). Same power ratings on the box, materially different electrical design underneath.

The current figure is the whole story.

54.6 A versus 18.2 A. Both deliver 12 kW, but the single-phase unit pushes it all down one conductor while the three-phase unit splits it across three. That single row explains most of the practical differences: cable sizing, switchboard load, voltage rise along your street, and how gently the system sits on the grid.

Voltage rise is the one that bites Australian households. When your inverter exports hard on a single phase, it lifts the voltage at your connection point. Lift it far enough and the inverter must throttle back or trip off to stay inside AS/NZS 4777.2 limits — so you lose the export you paid for, usually on the sunniest days. Spreading the same power across three phases cuts the current per conductor to roughly a third and largely removes that pressure.

Higher DC voltage means longer strings.

The three-phase unit accepts up to 1,100 V DC against 600 V for single-phase, with an MPPT range running to 1,000 V. In practice that means more panels in series per string, which suits larger arrays and longer cable runs from a shed or a distant roof. The trade-off is that it carries two MPP trackers rather than four, so it handles fewer independent roof orientations.

Which one you get is usually not a choice.

If your home has a single-phase supply, you use the single-phase unit unless you pay to upgrade the service — which means a network application, a new mains cable and often a switchboard rebuild. That is rarely worth doing for storage alone. If you already have three-phase, the TP2 is almost always the better engineering answer, and it becomes close to mandatory if you want to run three-phase loads through backup.

The honest test: check your main switch. Three separate poles feeding the main switch means three-phase. One means single-phase. If you are unsure, a photo of the switchboard settles it in seconds — send us one and we will tell you which product line applies before anyone quotes you.

The two Sigenergy EV chargers are not competing products.

Sigenergy sells an AC charger and a DC charging module, and they solve different problems. Buying the wrong one is expensive, because the DC unit costs multiples of the AC one and most households never use what it does.

The AC chargers: 7 kW unless you have three phases.

The EVAC 7 runs on a single-phase 220–240 V supply at 6–32 A. The EVAC 11 and EVAC 22 both need three-phase. So on a single-phase home the decision is made for you: 7 kW, which adds roughly 40 km of range an hour and fills any normal commute overnight several times over.

Note the odd pairing in the middle: the EVAC 11 tops out at 16 A per phase while the EVAC 22 runs to 32 A. If you have three-phase and the switchboard capacity, the 22 is the more capable unit; the 11 exists for supplies that cannot give 32 A per phase.

The DC module is about discharging, not charging.

The SigenStor EVDC comes in 12.5 kW and 25 kW, both bidirectional, running 150–1,000 V over CCS2. The charging speed is the least interesting thing about it. The point is the second row: it discharges at the same rate, so the car becomes a battery for the house.

An EV pack is typically several times the size of a home battery. Being able to draw 25 kW back out of it changes what a blackout looks like, and it changes what an evening peak costs. That is a genuinely different proposition from an AC charger.

Who should honestly skip it.

V2X only works if your specific vehicle supports bidirectional DC over CCS2, and in Australia in 2026 most do not. Before anyone quotes you an EVDC, the question to answer is not "how fast does it charge" but "does my car discharge, and is that supported here today?" If the answer is no, or not yet, the EVAC 7 plus a larger battery stack is the better spend — and we will tell you so. Our V2L versus home battery guide works through where each one wins.

What the spec sheet says carefully, and what it leaves out.

"100% depth of discharge" needs its footnote.

The datasheet advertises 100% depth of discharge, and the footnote attached to it clarifies that this refers to the usable energy capacity. Both statements are true together: you can draw down the full usable figure, and the usable figure is 5.2 kWh of a 5.38 kWh pack. It is not a claim that you get all 5.38 kWh.

That is a fair way to describe an LFP battery, and Sigenergy states both numbers plainly, which is more than several competitors do. But "100% DoD" and "5.2 of 5.38 kWh" describe the same battery, and only one of them makes it into most sales conversations.

10,000 cycles is a conditional figure.

The modules use LiFePO4 chemistry with 280 Ah cells and a stated cycle life of 10,000 cycles, carrying a footnote for the test conditions. Cycle-life ratings are always measured at a specific depth, temperature and rate, and Australian conditions — a battery on a west wall through a Perth or Adelaide summer — are not laboratory conditions. Treat 10,000 as the ceiling under ideal use, not a promise.

The warranty term is not in the datasheet.

Worth saying plainly: the Australian datasheet we have quoted throughout this page does not state a warranty period. It links to a warranty lookup instead. Any warranty figure you are quoted should be confirmed against Sigenergy's own current warranty document for the Australian market, with the version and date on it, before you sign.

That is not a knock on the product — it is how most manufacturers now handle warranty, because terms change by market and by year. It does mean a warranty claim in a sales deck is not a specification, and we would not treat it as one. Our guide to what battery warranties actually cover explains which clauses decide whether a claim gets paid.

What is certified.

The range is listed to AS/NZS 4777.2:2020+A1:2024, the Australian grid-connection standard, and the modules are IP66. Both matter for approval and for outdoor mounting. Anything sold here without current AS/NZS 4777.2 compliance cannot be legally grid-connected, so this is a floor rather than a feature.

Sigenergy SigenStor sizes
FAQ.