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Build my system
Off-grid solar system for a house
A complete off-grid solar system for a family house — no grid connection needed, sized to run everything day and night. Built around the Voltronic Power Axpert MAX II Duplex 11K, with 2 × LIO II-4810 — Voltronic Power quotes the rest on WhatsApp.
That's a 11 kW inverter, 40 kWh of battery storage and 11 panels working together.
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11 × 550 W solar panels · fills ~29 m² of roof
We'll quote this part for you on WhatsApp
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 11 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.
With no grid to lean on at all, that day (plus a cloudy-day reserve) needs about 25.4 kWh; the 2 × LIO II-4810 we've picked gives you 40 kWh installed.
The array works out to 5.9 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?
This system is sized to store about 25.4 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?
11 panels, about 5.9 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 / 5.9 kWp baseline.