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Off-grid solar system for an apartment
A complete off-grid solar system for an apartment with no grid connection at all — panels, inverter and battery sized to run day and night on their own. Built around the Felicity MJS IVPS7548, with FLB48314TG1 and 6 × GK-1-72HTBD-580M.
That's a 6 kW inverter, 14.4 kWh of battery storage and 6 panels working together.
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 6 kW inverter carries comfortable headroom above that peak.
Day to day, that's about 13.8 kWh of use — the number the Felicity MJS bundle above is built to cover.
With no grid to lean on at all, that day (plus a cloudy-day reserve) needs about 13.8 kWh; the FLB48314TG1 we've picked gives you 14.4 kWh installed.
The array works out to 3.2 kWp — 6 panels of the GK-1-72HTBD-580M across roughly 16 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?
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?
This system is sized to store about 13.8 kWh — a full day of use plus a cloudy-day reserve — because there's no grid to fall back on.
How many solar panels does it need?
6 panels, about 3.2 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 / 3.2 kWp baseline.