Victron Official Dealer1,000+ Systems SoldFree UK Delivery

Off-grid power systems, sized for real British winters

The same 48V platform we’ve put into over a thousand campervans, engineered for buildings and boats: Fogstar lithium, Victron power electronics and solar, delivered as a complete kit with a wiring diagram. Sized honestly against real solar data for your spot — including the dark weeks.

Customer with dog in van
Customer in their van
Customer van build
Customer wiring diagram
1,000+ Vans Powered
Rated Excellent on Trustpilot4.9 stars · 150+ reviews
Free delivery
Free design consultations with an expert
Custom wiring diagram & install guide with every order

What would your December look like?

Pick your region for a quick estimate of a typical whole-dwelling system — then run the full calculator for your exact spot.

July, solar + battery

All month

December, solar + battery

7 days

December genset top-up

~19 h/month

Run the full calculator for your exact spot

Quick estimate from typical regional solar yields (MultiPlus-II 48/10000 · 32 kWh Fogstar · 6 kWp). The full calculator simulates real hourly PVGIS data for your location.

Takes under 5 minutes

How It Works

Size it honestly
Get your kit
Fit it your way

Use the free off-grid calculator: pick what you’re powering and where, and see real month-by-month numbers — December included.

A complete 48V system — Fogstar lithium, Victron power electronics, solar and distribution — with a custom wiring diagram for your build.

Competent DIY installers fit our systems every week, or hand the diagram to your local electrician for a straightforward certified install.

The Vunked Promise

5-Year Complete System Warranty

Every component covered. We stand behind our systems because we build them to last.

Custom Wiring Diagram & Install Guide

Every kit ships with a professionally designed wiring diagram for your exact system, ready for you or your electrician to work from.

Fire-Suppressed, Self-Heating Lithium

Our Fogstar 48V batteries include built-in heating for winter charging and heat-activated fire suppression — designed for timber buildings, huts and barns.

Unlimited Professional Support

We're here before, during and after your install — sizing, wiring questions, commissioning, the lot.

Free UK Delivery

Everything arrives together, ready to install. No chasing multiple deliveries from different suppliers.

30-Day Money Back Guarantee

Changed your mind? Return your order within 30 days for a full refund. No questions asked.

What Our Customers Say

Rated Excellent on TrustpilotRated 4.9 with over 150+ 5 star reviews

Great experience with the consultant…

Great experience with the consultant engineer understanding needs, requirements and skill levels involved in the project. Only suggestion I would make is that rank beginners may not understand connection point requirements of the various components - it would be useful to include on diagrams whether a lug is required or not, and which type/size end to use!

Brittany Hook
3 weeks ago

Great service from start to finish

Great service from start to finish, always available for advice and help, cannot recommend enough, i wouldnt trust my solar/electrics set up with anyone else!!

Carl Longden
1 week ago

Sound advice and no pushy sales.

From initial enquiry to placing our order, over a period of 2 weeks Sam Barker was always ready to offer advice either over the phone or by email. Advice was based on what WE wanted to get from our electrical system. Never felt as though he was upselling, just simply advising the best solution. Checks elsewhere confirmed Sam's advice and design specification was spot on. Thanks Sam. If we ever do this again, I'll be back.

Chris Parkin
1 week ago

Great kit and product backup

Supply of the right kit for our application was made simple by competent, in person, service backup. Wiring diagrams were provided and our technical questions over the phone were given prompt attention and answered in layman's terms. The Vicron Smart Dc to DC charger supplied is an excellent piece of kit.

Gordon McKillop
1 week ago

Brilliant service

Brilliant service

Stuart gardiner
3 weeks ago

My new van build

I was unsure about what I needed for my new van conversion so I used the build feature and arranged a consultation. Sam asked some questions about the build and gave me some options and I went ahead and ordered. The kit was with me in a matter of days from vunked even tho I ordered right after new year! There was a bit of a mix up with my battery delivery from fogstar but Sam was on hand to have it sorted straight away. Can't fault the quality or the service I've recieved from vunked.

Dale Leadingham
2 months ago

Great quick service and spot on wiring…

Great quick service and spot on wiring diagram that was easy to follow!

ian potts
2 months ago

Vunked electric set up

Couldn't recommend vunked enough. I was very apprehensive about the van electrics but at the same time I wanted to give it a go. Sam from vunked was amazing to deal with, from our initial phone call to various e mails and calls during the install (im sure I did his head in) but he was always there to help. The wiring diagrams and instructions you receive are invaluable and easy to follow there is no way I would've been able to work that all out and install. It is very satisfying knowing everything is wired correctly and most importantly safe!!. Cheers Sam

Mark Graham
1 month ago

It's the second time I've used Vunked…

It's the second time I've used Vunked as the service was great last time. Yet again, brilliant! Tried to save a bit by sourcing the main components from Renogy, and Vunked didn't have an issue with this. Top work guys!

D Fan
1 month ago

Great expert advice

Unfortunately it turned out I couldn't buy the kit from Vunked due to geographical limitations, but Sam was anyway incredibly helpful and gave me great advice to design a suitable electrical system for my conversion, saving me a lot of time and headaches! Highly recommend!

Andrea
1 month ago

Great experience with the consultant…

Great experience with the consultant engineer understanding needs, requirements and skill levels involved in the project. Only suggestion I would make is that rank beginners may not understand connection point requirements of the various components - it would be useful to include on diagrams whether a lug is required or not, and which type/size end to use!

Brittany Hook
3 weeks ago

Great service from start to finish

Great service from start to finish, always available for advice and help, cannot recommend enough, i wouldnt trust my solar/electrics set up with anyone else!!

Carl Longden
1 week ago

Sound advice and no pushy sales.

From initial enquiry to placing our order, over a period of 2 weeks Sam Barker was always ready to offer advice either over the phone or by email. Advice was based on what WE wanted to get from our electrical system. Never felt as though he was upselling, just simply advising the best solution. Checks elsewhere confirmed Sam's advice and design specification was spot on. Thanks Sam. If we ever do this again, I'll be back.

Chris Parkin
1 week ago

Great kit and product backup

Supply of the right kit for our application was made simple by competent, in person, service backup. Wiring diagrams were provided and our technical questions over the phone were given prompt attention and answered in layman's terms. The Vicron Smart Dc to DC charger supplied is an excellent piece of kit.

Gordon McKillop
1 week ago

Brilliant service

Brilliant service

Stuart gardiner
3 weeks ago

My new van build

I was unsure about what I needed for my new van conversion so I used the build feature and arranged a consultation. Sam asked some questions about the build and gave me some options and I went ahead and ordered. The kit was with me in a matter of days from vunked even tho I ordered right after new year! There was a bit of a mix up with my battery delivery from fogstar but Sam was on hand to have it sorted straight away. Can't fault the quality or the service I've recieved from vunked.

Dale Leadingham
2 months ago

Great quick service and spot on wiring…

Great quick service and spot on wiring diagram that was easy to follow!

ian potts
2 months ago

Vunked electric set up

Couldn't recommend vunked enough. I was very apprehensive about the van electrics but at the same time I wanted to give it a go. Sam from vunked was amazing to deal with, from our initial phone call to various e mails and calls during the install (im sure I did his head in) but he was always there to help. The wiring diagrams and instructions you receive are invaluable and easy to follow there is no way I would've been able to work that all out and install. It is very satisfying knowing everything is wired correctly and most importantly safe!!. Cheers Sam

Mark Graham
1 month ago

It's the second time I've used Vunked…

It's the second time I've used Vunked as the service was great last time. Yet again, brilliant! Tried to save a bit by sourcing the main components from Renogy, and Vunked didn't have an issue with this. Top work guys!

D Fan
1 month ago

Great expert advice

Unfortunately it turned out I couldn't buy the kit from Vunked due to geographical limitations, but Sam was anyway incredibly helpful and gave me great advice to design a suitable electrical system for my conversion, saving me a lot of time and headaches! Highly recommend!

Andrea
1 month ago

Vunked excellent…

Purchasing items was easy with expert advice on the website and phone consultation, product's turned up within two days great service, not done instruction yet so hopefully get help during installation if needed.

Mr Nick Betts
2 months ago

These guys are amazing

These guys are amazing! Endlessly helpful even after ordering everything and adding things to the system - offering more wiring diagrams to help build the system at no extra cost and even offering phone calls to discuss what I'm trying to achieve! Could not recommend enough for someone who is inexperienced in electrics and needs some help along the way. Extremely clear instruction manual and wiring diagrams - thanks a lot Vunked team!

James Tilyard
2 months ago

Superb company

As a novice when it comes to van electrics Vunked proved to be my saviour when it came to ordering my electrical system. The website is full of fantastic information, answering all of my queries and helping me decide exactly what I needed and why. The ordering system was so easy to use and "behind the scenes" all the components, such as appropriate wires, fuses etc were automatically added and came in one delivery. It was accompanied by a wiring diagram and more detailed step by step guide which will prove invaluable. I had a small query (due to my ignorance) which I raised by email and Alan answered within minutes with the info required. Overall I'd have no hesitation in recommending Vunked and it's a comfort to know they are there to answer my queries. Well done!

Mr Donald Callum
2 months ago

From the phone call to order, perfect service

From the phone consultation to making the decision what we wanted was straightforward with a consultant listening to our wishes. We were offered several solutions, highlighting the differences between each of them. After our conversation the email gave us all that we ordered with another chance to make changes. No pressure, just a list of all the items where you could add or remove before finalizing your order. Order was confirmed and paid around lunch time, the whole order arrived the next day. Service from start to finish.

Erwin Oosterhoorn
3 months ago

Great service and communication

Great service and communication. The website is great. I'm a complete novice and they were super helpful. Would recommend. FIVE STARS

Emma
2 months ago

Excellent communication top class and service

Excellent communication and service

Daniel Garfoot
2 months ago

Legends

Started designing my system with another company (nohma) and when I came to purchase they ended up disappearing and not returning any calls or messages for 2 weeks. Ended up getting fed up of waiting as I was on a tight schedule so I gave vunked a message. Got a message back the same day and vunked where extremely happy to replicate the system and even price match. Kit then got sent out with wiring diagrams and build instructions being sent the same day as purchase. Instructions are super easy to understand even for me who try to stay away from any electrical jobs. Everything was with me within 2 days. Unfortunately my solar panel had been damaged during transit but when I contacted vunked about what to do they offered either a replacement sent out free of charge or a 50% refund on the panel with a guarantee that if it doesn't work a new panel will be sent no matter how late I do it. Overall my only issue was that I didn't use vunked in the first place. These legends are amazing to work with and cannot recommend them enough.

Josh Scott
3 months ago

Great company pleasure to deal with

Great company pleasure to deal with

Nigel Flatt
3 months ago

Excellent customer support

Really easy order processing. Quick delivery. Excellent after sales communications.

CE
3 months ago

Excellent service and delivery

Excellent service and delivery

Del Sturrock
3 months ago

Vunked excellent…

Purchasing items was easy with expert advice on the website and phone consultation, product's turned up within two days great service, not done instruction yet so hopefully get help during installation if needed.

Mr Nick Betts
2 months ago

These guys are amazing

These guys are amazing! Endlessly helpful even after ordering everything and adding things to the system - offering more wiring diagrams to help build the system at no extra cost and even offering phone calls to discuss what I'm trying to achieve! Could not recommend enough for someone who is inexperienced in electrics and needs some help along the way. Extremely clear instruction manual and wiring diagrams - thanks a lot Vunked team!

James Tilyard
2 months ago

Superb company

As a novice when it comes to van electrics Vunked proved to be my saviour when it came to ordering my electrical system. The website is full of fantastic information, answering all of my queries and helping me decide exactly what I needed and why. The ordering system was so easy to use and "behind the scenes" all the components, such as appropriate wires, fuses etc were automatically added and came in one delivery. It was accompanied by a wiring diagram and more detailed step by step guide which will prove invaluable. I had a small query (due to my ignorance) which I raised by email and Alan answered within minutes with the info required. Overall I'd have no hesitation in recommending Vunked and it's a comfort to know they are there to answer my queries. Well done!

Mr Donald Callum
2 months ago

From the phone call to order, perfect service

From the phone consultation to making the decision what we wanted was straightforward with a consultant listening to our wishes. We were offered several solutions, highlighting the differences between each of them. After our conversation the email gave us all that we ordered with another chance to make changes. No pressure, just a list of all the items where you could add or remove before finalizing your order. Order was confirmed and paid around lunch time, the whole order arrived the next day. Service from start to finish.

Erwin Oosterhoorn
3 months ago

Great service and communication

Great service and communication. The website is great. I'm a complete novice and they were super helpful. Would recommend. FIVE STARS

Emma
2 months ago

Excellent communication top class and service

Excellent communication and service

Daniel Garfoot
2 months ago

Legends

Started designing my system with another company (nohma) and when I came to purchase they ended up disappearing and not returning any calls or messages for 2 weeks. Ended up getting fed up of waiting as I was on a tight schedule so I gave vunked a message. Got a message back the same day and vunked where extremely happy to replicate the system and even price match. Kit then got sent out with wiring diagrams and build instructions being sent the same day as purchase. Instructions are super easy to understand even for me who try to stay away from any electrical jobs. Everything was with me within 2 days. Unfortunately my solar panel had been damaged during transit but when I contacted vunked about what to do they offered either a replacement sent out free of charge or a 50% refund on the panel with a guarantee that if it doesn't work a new panel will be sent no matter how late I do it. Overall my only issue was that I didn't use vunked in the first place. These legends are amazing to work with and cannot recommend them enough.

Josh Scott
3 months ago

Great company pleasure to deal with

Great company pleasure to deal with

Nigel Flatt
3 months ago

Excellent customer support

Really easy order processing. Quick delivery. Excellent after sales communications.

CE
3 months ago

Excellent service and delivery

Excellent service and delivery

Del Sturrock
3 months ago
Trustpilot
Victron EnergyFogstarBlue Sea Systems

Common Questions About Off-Grid Power Systems

A battery bank, an inverter-charger and solar working together to power a building or boat with no mains connection. Solar charges the battery whenever there’s daylight, the battery carries your loads day and night, and the inverter provides normal 230V sockets. If you keep a generator, it becomes a backup charger rather than the thing you live off.

At 12V, serious loads mean enormous currents, thick expensive cable and hard limits on inverter size. Running the same system at 48V quarters the current, which is why it’s the standard for buildings, larger boats and anything running kettles, power tools or several kilowatts of inverter. Our 48V systems run Victron MultiPlus inverter-chargers from 3 kVA to 10 kVA-class with Fogstar lithium banks from 12.8 kWh to 64 kWh.

A sensible mid-size system (16 kWh battery, ~3 kW of solar, 5 kVA inverter) runs a garden office or hosted shepherd hut comfortably: lighting, fridge, kettle, laptops, Wi-Fi and a heating approach chosen with winter in mind. Larger systems (32–64 kWh, 6–12 kW of solar) run workshops with power tools, multi-pod glamping sites or a whole off-grid dwelling with heat on LPG, oil or wood.

This is the question that matters, and the answer depends on where you are and how you heat. A UK solar array produces a fraction of its summer output in December — and the same system needs roughly three times the winter generator support in the Highlands as it does in Kent. That’s why our calculator simulates real hourly solar data for your location rather than quoting a sunny average. Which months run purely on solar, and how many top-up hours the dark months need, is exactly what it shows you.

In a hybrid 48V system the generator never powers your appliances directly. It plugs into the inverter-charger’s AC input and charges the battery in short bursts at high load — the efficient way to run a genset — usually auto-started by the system when the battery gets low. Most sites see the generator stay off entirely from spring to autumn and run a handful of hours a week in midwinter.

Our 48V Fogstar batteries are designed for exactly this setting: built-in heating so they charge safely below freezing, and heat-activated fire suppression inside the case. Combined with proper fusing, isolation and the wiring diagram we supply for every kit, they’re a system designed to be installed in huts, cabins, barns and outbuildings.

Either you or your local electrician. Every kit ships with a custom wiring diagram and installation guide; competent DIY installers fit our systems every week, and an electrician can work straight from the diagram and certify the 230V side. We support the install either way.

Book a Free Consultation

Talk to our team and we'll spec your system with you. No pressure, no obligation.