GRID-CONNECTED SOLAR & BATTERY SPECIALISTS
Cut your electricity bills with solar & battery designed around your home.
Get a tailored recommendation for new solar panels, solar with battery storage, or a battery added to your existing array.
Installation across mainland UK · Supply only delivery throughout the UK
- Solar and battery system design
- JA Solar, Victron and Pytes options
- Mainland UK installation or UK-wide equipment supply
- No-obligation recommendation
Free, no-obligation recommendation from a UK-based solar and battery team.
DESIGNED FOR YOUR PROPERTY
A system recommendation you can understand
Your roof, electricity use, existing equipment and future plans all shape the recommendation.
WHAT DO YOU NEED?
Start with the route that matches your home.
Choose the closest fit. We’ll confirm compatibility, system size and the right next step.
Real experiences from real Callidus customers.
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EQUIPMENT WE KNOW
Proven components, selected as one system.
Callidus commonly designs solar & battery storage systems around JA Solar panels, Victron power electronics and Pytes battery storage. Final equipment is selected for the property and project goals.
SOLAR PANELS
JA Solar
JA Solar panels turn daylight into electricity your home can use straight away. From running appliances to charging a compatible battery, your roof becomes a source of energy that helps reduce how much electricity you need to buy.
- Why it is considered
- Power everyday appliances with electricity generated on your roof.
Store surplus generation for later when paired with battery storage.
Get a panel layout designed around your available space, shading and energy needs. - Warranty
- 25 Year Performance Warranty
POWER ELECTRONICS & CONTROL
Victron Energy
Victron manages how energy moves between your battery, home and the grid. With suitable equipment and settings, it can prioritise your stored energy, charge during cheaper tariff periods and provide automatic backup to selected circuits during a power cut.
- Why it is considered
- Make use of cheaper electricity rates with scheduled battery charging on a suitable tariff.
See solar production, battery charge and household energy use through the free VRM app, with a compatible GX device and internet connection.
Choose optional backup designed around the essentials you want to keep running. Available power and runtime depend on your system and battery charge. - Warranty
- 5 Year Manufacturer Warranty
BATTERY STORAGE
Pytes
Pytes batteries store surplus solar electricity so you can use it later—for cooking, lighting and everyday evening use. They can also store cheaper off-peak electricity, helping reduce purchases during more expensive periods on a suitable tariff.
- Why it is considered
- Use more of your solar generation after the sun goes down.
Get storage sized around your household’s consumption and priorities.
Plan for additional capacity with modular options, subject to model compatibility, available space and system limits. - Warranty
- 10,000 Discharge Cycles
REAL CALLIDUS PROJECTS
See what thoughtful system design looks like.
TORQUAY · SOLAR + BATTERY
How Ian Slashed His Energy Bills & Keeps the Power On – Even During Grid Outages
At Callidus Trade we specialise in helping homeowners take control of their energy, reduce reliance on the grid and save money on their energy bills all without sacrificing the comforts o...
- System
- 13.2 KW Solar, 24kVA Power, 48kWh Battery Storage
- Result
- Up to 90% Reduction in Grid use, Back-Up Power in a power cut.
DEVON · BATTERY BACK-UP SYSTEM
How to Provide Backup Power to an Online Warehouse (Without Guessing)
When the grid fails, warehouses lose more than lights, they lose picking, packing, dispatch, and the systems that keep orders moving. Learn the design principles that matter.
- System
- 90kVA Power, 180 kWh Battery Storage
- Result
- Reliable full scale battery back-up system for an entire high power needs warehouse.
HOW IT WORKS
A clear route from enquiry to handover.
We gather the right information early so the recommendation and next conversation are useful.
- 1
Tell us about your property
Share your electricity use, roof, existing equipment and goals.
- 2
Initial system recommendation
A specialist reviews the practical details and discusses the most suitable route.
- 3
Survey and final design
The property and electrical requirements are confirmed before the final proposal.
- 4
Installation and commissioning
The agreed system is installed, tested and configured for the property.
- 5
Monitoring, handover and support
You receive system guidance, monitoring access and the agreed aftercare route.
Expert Victron system design
Find the right solar and battery system for your home
Answer a few quick questions about new grid-connected solar, solar with battery storage, or adding a battery to your existing array.
COMMON QUESTIONS
Questions before you request a quote?
How much could solar save me?
Savings depend on the array size, roof orientation, shading, tariff, export rate, household demand and when electricity is used. Your proposal should include a property-specific generation and savings estimate rather than relying on a generic percentage. Solar only systems can be around 60% savings and solar battery systems can be up to 90% savings.
How is the correct system size calculated?
The usable roof area, annual electricity consumption, daytime usage, future demand and local connection requirements all matter. The aim is to design a system around the property rather than simply fit the maximum number of panels.
Should I choose solar panels with or without a battery?
A battery can increase the amount of solar generation used in the home, particularly when more electricity is consumed outside daylight hours. The right answer depends on usage, tariff, budget and future plans. With the price of batteries being very reasonable now it makes sense for most customers to add battery storage to their system.
Can I add a battery to my existing solar system?
Often, yes. Compatibility depends on the existing inverter, meter, wiring and what you want the battery to do. Share the equipment details you have and the team can advise on the appropriate route. There is almost always a way to add a battery system to existing solar system.
Can the system provide power during a power cut?
Solar and batteries do not automatically provide backup during an outage. Backup requires suitable equipment and design however we regularly supply systems with full backup capabilities.
How long does installation take?
The installation time depends on system size, access, roof type, electrical work and any network approval required. Your project programme will be confirmed after the design and survey stages. Actual installation typically takes between one and three days depending on the size, complexity, number of panels, length or difficulty of cable runs etc. We can typically install up to 16 panels normally in one day. Getting an install date can take some time depending on if a DNO is needed and the current DNO approval times for your area. Installs in some areas can be installed significantly quicker due to faster DNO approval times.
Will I need planning permission?
Many domestic solar installations are permitted development, but exceptions can apply to listed buildings, conservation areas, unusual mounting arrangements and some battery locations. Property-specific requirements should be checked before installation.
What warranties are included?
Warranty periods vary by panel, inverter, battery and installation agreement. JA Solar offers a 25 year performance warranty, Victron offers a 5 year manufacturer warranty and Pytes offers a 10,000 discharge cycle warranty.
Can Callidus help with export and grid-connection requirements?
Once we agree a price, we get a signed letter of authority from the customer, this a legal document that lets your solar installer or third party agent act on behalf of you when communicating with your energy supplier or local DNO. We then apply to DNO for you. You pay your local DNO Fee, once approved, we then book installation date that is suitable for all, install and commission your system. It will be MCS certified.
Will the install be MCS certified so I can export to the grid?
Your install will be MCS certified.
What information should I provide?
Useful details include a recent electricity bill/usage, roof photographs, meter and consumer-unit photographs, existing solar or inverter information, postcode, backup priorities and preferred timeframe.
Ready for a tailored recommendation?Tell us about your property and we’ll help identify the next step.