Brand deep-dives

DC fast charging at home: the Sigenergy EV module.

Every other home battery treats your EV as an afterthought on AC. Sigenergy stacks a bidirectional DC fast charger into the battery tower itself — solar to car with no conversion detour, and vehicle-to-home in the hardware. Here’s the honest picture.

6 min read · Last verified 2026-08-11

The 30-second take

The Sigen EV DC module comes in 12.5 kW and 25 kW versions and stacks into the SigenStor tower — around 150 km of range per hour at 25 kW.
It’s DC-coupled: solar can flow panel → battery → car without AC conversion losses, and it works with virtually all CCS2 EVs (150–1,000 V).
The hardware is bidirectional — vehicle-to-home and vehicle-to-grid capable — but Australian V2G rules are still settling state by state.
Compared to a typical 7 kW AC wallbox, 25 kW DC is a different league — and a different budget.
It’s a licensed-design decision: load management, phase, and switchboard capacity decide whether it fits your home.

What the module actually does

The Sigen EV DC Charging Module is a stack component, not a separate wallbox: it slots into the SigenStor tower and shares its DC bus. Two sizes exist — 12.5 kW and 25 kW — against the 7 kW of a typical home AC charger. At 25 kW you add roughly 150 km of range in an hour, in an IP66 enclosure with a CCS2 plug that covers almost every EV sold in Australia, across a 150–1,000 V DC input range.

Because it’s DC-coupled, midday solar can charge the car without the usual DC→AC→DC round trip through a wallbox — the same efficiency argument as the battery itself, extended to the vehicle.

V2H and V2G: what’s real in Australia right now

The module’s headline is bidirectionality: the hardware can discharge your car into the house (V2H) or the grid (V2G). An EV holds 60–100 kWh — four to six times a typical home battery — so a bidirectional car is the biggest “battery” most households will ever own.

The honest caveat: Australian V2G rules have been opening up progressively, and what you may operate depends on your state, your network, and your car’s manufacturer position — warranties and approved-vehicle lists are still catching up to the hardware. Buy the module for the DC fast charging today; treat V2G as capability you’re positioned for, not a promise for tomorrow morning. A Sigenergy-accredited installer will know the current rules for your network.

“An EV holds four to six times the energy of a typical home battery. Bidirectional hardware makes it the biggest battery you’ll ever own — once the rules in your state catch up.”

Who it suits — and who should skip it

Strong fit: EV households charging at home most days, especially with big solar arrays and daytime charging windows.
Strong fit: three-phase homes planning a bigger SigenStor stack anyway — the module extends a system you were already buying.
Weaker fit: one EV, mostly charged on cheap overnight tariffs — a 7 kW AC charger does that job for a fraction of the cost.
Site reality check: 25 kW of charging is a serious load. Switchboard capacity, phase availability and network rules decide feasibility — this is a licensed design decision, not a checkout add-on.

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.

Postcode in, up to 3 vetted installers out. Free for homeowners, no obligation. All solar guides · Federal rebates · Installers by suburb · How it works

Filed under: Brand deep-dives