Build Your Off-Grid 48V Energy System
Build Your Off-Grid 48V Power System
Solar, battery and inverter sized by a half-hourly simulation of your year. Every system is checked by our engineers before you buy.
4.9/5Victron, LuxPower and Fogstar hardware, designed for UK winters
Install Type
Choose how your system arrives. Either way you pick the same parts below — a board just means we wire the plant-room end for you.
Install Type
Choose how your system arrives. Either way you pick the same parts below — a board just means we wire the plant-room end for you.
Daily usage
Start with a site like yours — it ticks the typical appliances — or type your usage straight in. The simulation sizes everything from this figure.
Battery
Choose the size of your 48V battery bank.
Battery System
Choose the size of your 48V battery bank.
No Battery System Selected
Select a battery bank to preview details.
Battery System
Choose the size of your 48V battery bank.
No Battery System Selected
Select a battery bank to preview details.
Solar
Size a ground or roof array to keep your battery bank charged all year.
Solar System
Size a ground or roof array to keep your battery bank charged all year.
No Solar System Selected
Select an array size to preview details.
Solar System
Size a ground or roof array to keep your battery bank charged all year.
No Solar System Selected
Select an array size to preview details.
230V
Convert 48V battery power to 230V mains and charge from a generator or the grid.
230V System
Convert 48V battery power to 230V mains and charge from a generator or the grid.
No 230V System Selected
Select an inverter to preview details.
230V System
Convert 48V battery power to 230V mains and charge from a generator or the grid.
No 230V System Selected
Select an inverter to preview details.
Battery Monitoring
Victron Cerbo GX MK2 — included with every off-grid system.
Battery Monitoring
Victron Cerbo GX MK2 — included with every off-grid system.
Victron Cerbo GX MK2Included
The Cerbo GX MK2 is the brain of the system. It talks to the batteries, MPPT solar chargers and inverter, logs everything to Victron's free VRM portal so you can check the system from your phone anywhere, and lets us diagnose and tune it remotely.
Wall-mounted GX Touch 70 for the plant room. Without it you use the app and VRM.
Battery Monitoring
Victron Cerbo GX MK2 — included with every off-grid system.
Victron Cerbo GX MK2Included
The Cerbo GX MK2 is the brain of the system. It talks to the batteries, MPPT solar chargers and inverter, logs everything to Victron's free VRM portal so you can check the system from your phone anywhere, and lets us diagnose and tune it remotely.
Wall-mounted GX Touch 70 for the plant room. Without it you use the app and VRM.
Generator
Optional. Tell us if you have, or will add, a generator — the simulation shows how little it needs to run once the battery and solar are in.
Generator
Optional. Tell us if you have, or will add, a generator — the simulation shows how little it needs to run once the battery and solar are in.
4.9/5 • 100+ reviews“It is very satisfying knowing everything is wired correctly and most importantly safe!!” Mark Graham
Solar & battery days
--
Tightest month
--
Total
£0.00
Total
£0.00
Solar & battery days
--
Tightest month
--
Total
£0.00
Off-Grid 48V System Builder
Powering a cabin, glamping site, shepherd hut, workshop or smallholding without a grid connection is a different job to wiring a vehicle – bigger loads, bigger battery banks, and solar arrays measured in kilowatts. This free builder specs a complete 48V off-grid system around what you actually run, and models how long it lasts at your exact location.
Pick your appliances – washing machine, immersion heater, power tools, borehole pump – and the builder sizes a Fogstar 48V battery bank, a ground- or roof-mount solar array, and a Victron or LuxPower inverter to match, with a live parts list as you go.
Honest off-grid numbers, not brochure numbers
Drop a pin on your site and the builder pulls real solar irradiance data for that spot, then simulates your system through every month of the year. A setup that runs forever in June and struggles in December will tell you so – before you buy anything, not after.
What the builder does for you
- Calculates your daily consumption in kWh from the appliances you plan to run
- Sizes a 48V battery bank (16–64kWh) that can carry your heaviest loads through the night
- Matches a solar array and MPPT charging – or an all-in-one hybrid inverter with built-in solar inputs – to the bank
- Shows month-by-month off-grid performance for your exact location, winter included
Checked by an engineer before you buy
Off-grid systems at this scale deserve a second pair of eyes, so we don't sell them straight from a basket. When your build is ready, send it to us – a Vunked engineer checks the design over, confirms the details with you, and only then do you buy. It's the same care we'd want for our own site.
Design it now, and we'll check it with you.