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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 Felicity Solar IVBM10048P1G1 10kW Single-Phase Off-Grid Solar Inverter, with Felicity Solar FLA48350TG2 51.2V 17.5kWh LiFePO4 Battery and 10 × Felicity Solar GK-1-72HTBD-580M 580W Solar Panel.
That's a 10 kW inverter, 15.8 kWh of battery storage and 10 panels working together.
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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 10 kW inverter carries comfortable headroom above that peak.
Day to day, that's about 25.4 kWh of use — the number the Felicity Solar bundle above is built to cover.
We set aside about 8.5 kWh for that window; the Felicity Solar FLA48350TG2 51.2V 17.5kWh LiFePO4 Battery we've picked gives you 15.8 kWh installed, so the essentials keep running through the cut.
The array works out to 5.5 kWp — 10 panels of the Felicity Solar GK-1-72HTBD-580M 580W Solar Panel across roughly 26 m² of roof — 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?
10 panels, about 5.5 kWp, filling roughly 26 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 / 5.5 kWp baseline.