Build my system
5 kW solar system for an apartment with overnight backup power
A solar system sized for an apartment that carries the fridge, lights and Wi-Fi through a full night without grid power. Built around the Deye 5 kW Single-Phase Hybrid Solar Inverter SUN-5K-SG04LP1-EU, with Deye 10.2 kWh 51.2 V Lithium Solar Battery RW-F10.2 — order the rest online from the Deye catalogue.
That's a 5 kW inverter, 9.2 kWh of battery storage and 6 panels working together.
If 4 hours are enough instead of 8, the storage needed falls to 2.3 kWh — 4.6 kWh installed across 1 battery unit(s), 4.6 kWh less. The array stays at 3 kWp. Solar system for an apartment with evening backup power
What is inside
Solar panels×6
6 × 550 W solar panels · fills ~16 m² of roof
How we sized it
This system is built to handle 4.9 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 5 kW inverter carries comfortable headroom above that peak.
Day to day, that's about 13.8 kWh of use — the number the Deye bundle above is built to cover.
We set aside about 4.6 kWh for that window; the Deye 10.2 kWh 51.2 V Lithium Solar Battery RW-F10.2 we've picked gives you 9.2 kWh installed, so the essentials keep running through the cut.
The array works out to 3 kWp — 6 panels across roughly 16 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?
1–2 bedrooms, one AC, the everyday basics. It's sized to handle up to 4.9 kW at once — enough for whichever appliance switches on hardest.
How long does the backup last?
It's sized to set aside about 4.6 kWh for that window — about 8 hours at this home's average rate of use.
How many solar panels does it need?
6 panels, about 3 kWp, filling roughly 16 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 4.9 kW / 3 kWp baseline.
Other system sizes
- 5 kW solar system for an apartment with evening backup power
- 5 kW off-grid solar system for an apartment
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- 12 kW solar system for a villa with overnight backup power
- 6 kW solar system for a shop with overnight backup power
- 10 kW solar system for an office with overnight backup power
- Solar system for a farm with overnight backup power