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12 kW solar system for a villa with evening backup power
A solar system for a large villa that keeps every AC, the freezer and the pump running through a few hours of evening power cuts. Built around the Deye 12 kW Single-Phase Hybrid Solar Inverter SUN-12K-SG01LP1-EU, with Deye 16 kWh 51.2 V Lithium Solar Battery RW-F16 — order the rest online from the Deye catalogue.
That's a 12 kW inverter, 14.4 kWh of battery storage and 20 panels working together.
To carry 8 hours instead of 4, the same home has to store 16.5 kWh instead of 8.3 kWh — 28.8 kWh installed across 2 battery unit(s), 14.4 kWh more. The array stays at 10.9 kWp. Solar system for a villa with overnight backup power
What is inside
Solar panels×20
20 × 550 W solar panels · fills ~52 m² of roof
How we sized it
This system is built to handle 11.7 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 12 kW inverter carries comfortable headroom above that peak.
Day to day, that's about 49.5 kWh of use — the number the Deye bundle above is built to cover.
We set aside about 8.3 kWh for that window; the Deye 16 kWh 51.2 V Lithium Solar Battery RW-F16 we've picked gives you 14.4 kWh installed, so the essentials keep running through the cut.
The array works out to 10.9 kWp — 20 panels across roughly 52 m² of roof, ordered from the Deye catalogue — 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?
4+ bedrooms, four ACs plus a freezer and a pump, a large household running everything. It's sized to handle up to 11.7 kW at once — enough for whichever appliance switches on hardest.
How long does the backup last?
It's sized to set aside about 8.3 kWh for that window — about 4 hours at this home's average rate of use.
How many solar panels does it need?
20 panels, about 10.9 kWp, filling roughly 52 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 11.7 kW / 10.9 kWp baseline.
Other system sizes
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- 12 kW off-grid solar system for a villa
- 12 kW grid-tied solar system for a villa
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- 10 kW solar system for a house with evening backup power
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- 10 kW solar system for an office with evening backup power
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