Myponga Solar, Battery and DC EV Charger

The short answer

NG Elec installed 11.4 kW of JA Solar, a Sigenergy 30 kW three-phase hybrid inverter, 26.28 kWh of usable battery and a Sigenergy 25 kW DC EV charger at a rural property in Myponga. The job included removing an old Tesla Powerwall 2, upgrading the house to three phase through a 30 m trench, and whole home blackout backup.

The system

What went in.

Site	Rural property, house and shed, tin roof, three phase
Solar	11.4 kW: 24 × JA Solar DeepBlue 4.0 Pro 475 W
Inverter	Sigenergy SigenStor EC 30.0 TP, 30 kW three phase
Battery	3 × Sigenergy SigenStor BAT 10.0 (26.28 kWh usable)
EV charger	Sigenergy 25 kW DC charger
Blackout backup	Whole home
Electrical	Three-phase supply upgrade to the house, Type A RCBOs where needed
Civil	30 m trench with a vac truck and service locator
Completed	September 2026

The job

Brief, build, result.

The brief

The owners had an older Tesla Powerwall 2 and Fronius inverter, an electric car, and a house fed from a switchboard in the shed.

They wanted one system that could run the house, back up everything in a blackout and charge the car quickly from their own solar.

What we did

We removed the old Powerwall and gateway, brought the existing panels into the new system, and installed 24 new JA Solar panels with a 30 kW Sigenergy three-phase hybrid inverter and three battery modules.

To get three phase to the house we organised a service locator and a vac truck for a 30 m trench from the shed switchboard, then upgraded circuits to Type A RCBOs where needed. The Sigenergy 25 kW DC charger runs off the same system, so the car charges from the sun.

The result: One app now shows the solar, the battery and the car, and the whole house stays on in a blackout. Thinking about an EV charger? See our EV charger installation page or our three-phase upgrades.

FAQ

Questions people ask us.

Can I replace an old battery with a new system?

Yes. On this job we removed a Tesla Powerwall 2 and gateway and brought the existing panels into the new Sigenergy system.

Do I need three phase for a DC EV charger?

For a fast DC charger and a big hybrid inverter, three phase is usually the way to go. We check your supply and quote the upgrade if it's needed.

Can you handle the trenching too?

Yes. We organise the service locator and vac truck, run the cable and leave you to backfill, or arrange it as part of the job.

Free quote

Want something like this?

Tell us about your place and what you want it to do. We'll design it and send a free, itemised quote.

1
We call you
A local consultant calls within one business day to ask a few questions.
2
We design it
We look at your roof, bills and switchboard, using satellite and drone imagery where it helps.
3
You get an itemised quote
Clear pricing with rebates already taken off. No pressure, no call centre.

Lifetime workmanship warranty$0 deposit optionsLicensed electriciansFree, itemised quotes

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More

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Call the team on 0425 322 552, Monday to Friday, 8am to 5pm.

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Solar, battery and a 25 kW DC EV charger on a Myponga property

Want something like this?

Thanks, we've got it.

What went in.

Brief, build, result.

The brief

What we did

Questions people ask us.

Want something like this?

Got it, thanks.

Related.

Rather talk it through?