OFF-GRID SOLAR & BATTERY SPECIALISTS
Power your home or site without a mains connection.
Get a solar, battery and inverter system designed around what you need to power—with generator integration where required. Choose a pre-built system for your installer or installation across mainland UK.
- Pre-built and programmed options
- Victron & Pytes system specialists
- Installation across mainland UK
- Supply-only delivery throughout the UK
Free, no-obligation recommendation. Tell us what you know—we’ll help with the technical details.
Already have mains electricity? Explore grid-connected solar & batteries →
BUILT & PROGRAMMED IN DEVON
Designed around your real power needs.
Daily energy use, appliances, winter conditions and generator requirements shape your system.
WHAT DO YOU NEED TO POWER?
Start with the project that looks like yours.
Starting from scratch or upgrading an existing system? Choose the closest fit. We’ll help you work through the details.
REAL OFF-GRID EXPERIENCES
Chosen by people who rely on their own power.
Review 1 of 4
Customer experiences from Callidus off-grid installations and supply-only projects.
MEET OUR CUSTOMERS
See off-grid living for yourself.
Pete Goss MBE
Hear Pete describe his bespoke Callidus off-grid power management system.
Richard Hawkes
Richard shares his experience of living off-grid.
WINTER IS PART OF THE DESIGN
Designed for your winter demand—not just summer sunshine.
Off-grid power needs to work when solar generation is low as well as when the sun shines. We assess your location, daily consumption, appliances and seasonal use to recommend the right balance of solar, battery storage and backup generation.
Generate when daylight is available
Solar supplies daytime demand and recharges the batteries. We assess the usable array space, shading and seasonal generation.
Store energy for later
Battery capacity is sized around your loads and the reserve you need. A larger battery stores more energy; it does not create additional generation.
Plan another charging source
Where required, a suitable generator can supply demand and recharge the battery during prolonged low generation or higher usage.
SELECTED TO WORK TOGETHER
Generation, storage and control. One coordinated system.
We select the solar panels, inverter, batteries and controls around your demand. Final equipment and warranty terms are confirmed in your proposal.
SOLAR GENERATION
JA Solar
Generate electricity for daytime appliances and battery charging. Your array is designed around the site and how much energy you need across the seasons.
- Benefits for your site
- Roof- or ground-mounted options.
Usable space and shading assessed.
Seasonal generation considered alongside backup charging. - Warranty
- Model-specific product and performance terms confirmed in your quote.
POWER CONVERSION & CONTROL
Victron Energy
Turn stored battery energy into power for your appliances, coordinate charging and integrate a compatible generator when the design requires one.
- Benefits for your site
- Inverter sized for running and starting loads.
Optional automatic generator control.
Remote VRM monitoring with a compatible GX device and internet connection. - Warranty
- 5-year manufacturer warranty on eligible Victron hardware; terms apply.
BATTERY STORAGE
Pytes
Keep energy for overnight demand and periods of low solar generation. We select the model, usable capacity and installation arrangement for your site.
- Benefits for your site
- Storage matched to daily use and reserve needs.
Temperature and location requirements checked.
Modular expansion options, subject to compatibility and system limits. - Warranty
- Model-specific time, usage and capacity conditions confirmed in your quote.
REAL CALLIDUS PROJECTS
Off-grid systems built around real requirements.
A highly efficient annex and a growing commercial site need different designs. These examples show how we approach both.
OFF-GRID ANNEX · PRE-BUILT SUPPLY
Powering a two-bedroom off-grid annex
A pre-built, programmed system for a 90m² energy-efficient annex and meeting space. Pellet-boiler heating and a generator charging plan were part of the wider design.
- System
- 7.2kWp solar · 20.48kWh battery · Victron inverter/charger
- Result
- Workshop-assembled and tested equipment, supplied for installation on site.
SOMERSET · OFF-GRID SITE UPGRADE
More power without starting from scratch
Historic Helicopters needed more capacity as its restoration work expanded. The design reviewed inverter output, battery storage and solar generation together.
- System
- 40kW solar · 108kWh battery storage · three-phase Victron system
- Result
- Existing equipment retained as part of an expanded off-grid system.
UNDERSTAND THE COST & SCOPE
Choose the support your project needs.
A supply-only kit and a complete installed project have different costs. Your recommendation will explain what is included, what the site still needs and which decisions affect the final price.
Equipment supply
A specified system delivered throughout the UK for installation by your chosen competent installer. Final connections and site work need to be planned.
Pre-built & programmed
Choose an in-house assembled and tested power board to reduce component assembly and configuration on site. Site installation and commissioning are still required.
Supply & installation
Installation across mainland UK, with the survey, electrical work, commissioning and handover scope agreed in your proposal.
FROM FIRST QUESTION TO HANDOVER
A clear route to your off-grid system.
You do not need to arrive with a finished specification. Start with your project and we’ll help identify what needs checking.
- 1
Tell us what needs power
Share your site, appliances, current supply and seasonal use.
- 2
Review the requirements
A specialist assesses sizing, existing equipment and the winter charging plan.
- 3
Agree the design & scope
Confirm equipment, site work, backup requirements and supply or installation route.
- 4
Build, test & deliver
Where selected, your power board is assembled, programmed and tested before dispatch.
- 5
Commission & hand over
Complete the agreed installation route, system guidance and support arrangements.
YOUR PROJECT. OUR ENGINEERING EXPERIENCE.
Let’s plan the right off-grid system.
Answer a few questions about your site and what needs power. You do not need to know which inverter or battery to choose.
QUESTIONS BEFORE YOU START?
Practical answers about off-grid power.
Will an off-grid system work through a UK winter?
It can be designed for year-round use, but winter generation and prolonged dull weather need particular attention. We assess your demand, solar potential and battery reserve, and whether a generator or another charging source is needed. We do not assume that a battery alone can cover an extended shortage of generation.
Will I need a generator?
That depends on your location, seasonal demand, available solar space and reliability requirements. Many year-round UK off-grid sites benefit from generator charging. Automatic start/stop requires a suitable generator and controls. We will explain the proposed backup arrangement and whether generator supply is included.
Can I run heating, an electric shower or charge an EV?
These can be substantial loads. We need to assess energy consumption, simultaneous use, starting currents and charging sources before recommending a system. Tell us about them early; a larger inverter alone does not provide more stored energy or winter generation.
How much will my off-grid system cost?
A supply-only kit, a pre-built power board and a fully installed project have different scopes. Cost depends on loads, solar and battery capacity, generator requirements and site work. We will identify the appropriate route and explain equipment, installation and any exclusions in your proposal.
Can you supply a pre-built system for my installer?
Yes. We offer pre-built and programmed systems with equipment supply throughout the UK. The agreed board is assembled and tested before dispatch. A competent installer still needs to complete the site-specific electrical work, final connections and commissioning.
Where do you install?
We offer installation across mainland UK and supply-only delivery throughout the UK. Tell us your site postcode and preferred route so we can confirm access, scope and practical arrangements.
Can you upgrade my existing off-grid system?
Often, yes. We review the inverter, batteries, generator, protection and cabling before deciding what can be retained. Compatibility and condition matter; adding batteries is not always the answer to a power limitation.
Can I monitor it remotely?
Compatible Victron systems can show solar generation, battery state and consumption through VRM. Remote access requires suitable monitoring hardware and an internet connection at the site. We will confirm the monitoring and support arrangements for your system.
Does going off-grid remove planning or installation requirements?
No. Off-grid describes the electrical supply arrangement; it does not remove property, planning or electrical installation requirements. Roof or ground mounting, battery location and generator arrangements need to be checked for your project.
What happens after I enquire?
A specialist reviews your answers and discusses the requirements. The next step may be further load information, an equipment recommendation or a site assessment before a final design and quotation. You do not need a finished specification to start.
I already have mains electricity. Is this the right page?
If your main aim is lower electricity bills or backup during power cuts, a grid-connected solar and battery system may be a better route. Visit our grid-connected solar and battery quote page, or tell us about a costly new connection you are comparing.
Ready to plan your off-grid system?Tell us what you need to power. We’ll help you work through the options.