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One 9 kW hybrid inverter
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Build my system
Solar system for a house with overnight backup power
A solar system sized for a family house that keeps the fridge, lights and essentials running through a full night's power cut. Built around the Voltronic Power EnergyCube 305 — Voltronic Power quotes the rest on WhatsApp.
That's a 9 kW inverter, 13.5 kWh of battery storage and 11 panels working together.
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Solar panels×11
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11 × 550 W solar panels · fills ~29 m² of roof
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How we sized it
This system is built to handle 8.1 kW at once. Appliances like compressors and pumps briefly draw far more than their running power the moment they switch on — so we size for that peak moment, not just the average, which is what keeps the inverter from tripping when a few things start up together. And the 9 kW inverter carries comfortable headroom above that peak.
Day to day, that's about 25.4 kWh of use — the number the Voltronic Power bundle above is built to cover.
We set aside about 8.5 kWh for that window; the EnergyCube 305 we've picked gives you 13.5 kWh installed, so the essentials keep running through the cut.
The array works out to 5.6 kWp — 11 panels across roughly 29 m² of roof, which Voltronic Power quotes for you on WhatsApp — assuming the strong, fairly steady sunshine typical of our main markets (about 5.7 peak sun hours a day). Your own roof may do a little better or worse depending on shading and the season.
Frequently asked questions
What can this system power?
2–3 bedrooms, two ACs, a full family household. It's sized to handle up to 8.1 kW at once — enough for whichever appliance switches on hardest.
How long does the backup last?
It's sized to set aside about 8.5 kWh for that window — about 8 hours at this home's average rate of use.
How many solar panels does it need?
11 panels, about 5.6 kWp, filling roughly 29 m² of roof.
Can I expand this system later?
Yes — inverters, batteries and panel arrays in this range are modular, so you can add more battery modules or extra panels later, starting from this 8.1 kW / 5.6 kWp baseline.