Maximise the value of your solar panels by storing excess energy for use when you need it most. Deltawatt Ltd provides expert solar battery storage installation across Kent and South East London, helping you achieve greater energy independence, reduce bills further, and make the most of your renewable energy investment.
As MCS certified and RECC approved installers with over 11 years of experience, we deliver professional battery storage solutions that integrate seamlessly with your solar PV system. Whether you're adding storage to existing solar panels or installing a complete solar and battery package, our expertise ensures optimal performance and maximum savings.
We use only high-quality battery systems from leading manufacturers, backed by comprehensive warranties and our commitment to exceptional installation standards. Our team will design a storage solution tailored to your energy usage patterns and requirements.
A solar battery storage system captures excess electricity generated by your solar panels during the day and stores it for use later. Instead of exporting surplus energy to the grid at low rates, you store it and use it during evenings, overnight, or on cloudy days when your panels aren't generating enough power.
This dramatically increases the amount of solar energy you use directly, reducing your reliance on expensive grid electricity and maximising your return on investment in solar panels.
Maximise Solar Self-Consumption - Use more of the electricity you generate rather than exporting it to the grid. Most households without storage only use 30-40% of their solar generation directly. With battery storage, this can increase to 70-90%.
Reduce Energy Bills Further - Store cheap solar energy during the day and use it during expensive peak evening hours instead of buying from the grid. The savings compound significantly over time.
Energy Independence - Reduce reliance on the national grid and energy suppliers. You're less affected by price increases and supply issues.
Backup Power - Some battery systems can provide emergency backup during power cuts, keeping essential appliances running when the grid fails.
Time-of-Use Tariff Optimisation - Charge your battery during cheap off-peak hours and use stored energy during expensive peak periods, even without solar panels.
Increased Property Value - Battery storage adds to your home's appeal, demonstrating energy efficiency and offering buyers long-term savings.
Environmental Benefits - Maximise your use of clean, renewable energy and further reduce your carbon footprint.
Future-Proof Your Home - As energy prices rise and renewable energy becomes increasingly important, battery storage positions your property for the future.
During sunny periods when your solar panels generate more electricity than you're using, the excess energy charges your battery rather than being exported to the grid. When your solar generation drops (evenings, nights, cloudy days) or your consumption increases, your home automatically draws power from the battery before importing from the grid.
Modern battery systems intelligently manage this process, learning your usage patterns and optimising when to store, use, or export energy for maximum benefit.
The energy flow:
This intelligent management ensures you're always using the cheapest available energy source.
Already have solar panels? Adding battery storage is one of the best upgrades you can make. We specialise in retrofitting batteries to existing solar installations, working with all major solar panel brands and inverter types.
Retrofit battery options:
AC-Coupled Batteries - These work with your existing solar inverter, making them compatible with virtually any existing solar system. They're ideal for adding storage without replacing working equipment.
DC-Coupled Batteries - If your existing inverter is due for replacement or you want maximum efficiency, DC-coupled systems integrate battery storage at the DC level before conversion to AC power.
We'll assess your existing system and recommend the most cost-effective, efficient solution for adding battery storage to your solar panels.
Installing solar panels and battery storage together offers the most integrated, efficient solution. We design complete systems where the solar inverter and battery work in perfect harmony from day one.
Advantages of combined installation:
Whether you're building a new property or making the transition to renewable energy, a complete solar and battery package provides the ultimate energy solution.
Battery storage isn't just for solar panel owners. If you're on a time-of-use electricity tariff with cheap overnight rates, a battery can store cheap electricity at night and supply your home during expensive daytime hours.
This "grid charging" strategy can significantly reduce bills, particularly as the differential between peak and off-peak rates increases. When you later add solar panels, your battery is already in place and ready to store solar energy too.
Lithium-Ion Batteries - The most common technology, offering high energy density, long lifespan, and excellent efficiency. These are the same proven technology used in electric vehicles.
Modular Systems - Start with the capacity you need now and expand later as your requirements grow or budget allows. Modular batteries offer flexibility and scalability.
All-in-One Solutions - Integrated battery and inverter systems that combine all components in a single unit for simple, space-efficient installation.
Backup-Capable Systems - Battery systems that can isolate your home from the grid during power cuts, keeping essential circuits running.
We stock and install battery systems from leading manufacturers, all with substantial warranties and proven track records.
Choosing the right battery size is crucial for maximising value. Too small and you won't store enough energy for your needs. Too large and you're paying for capacity you don't use.
Typical domestic battery sizes:
During our consultation, we'll analyse your energy consumption patterns and recommend the optimal battery size for your needs and budget.
Battery storage and electric vehicle charging complement each other perfectly. Your battery can store solar energy during the day and help charge your EV in the evening when you return home, maximising use of your own renewable energy.
Some advanced systems can also manage EV charging intelligently, ensuring your battery retains enough energy for household use whilst taking advantage of any excess solar generation.
As specialists in both battery storage and EV charger installation, we design integrated systems that work seamlessly together.
Modern battery systems include sophisticated energy management capabilities:
Usage Learning - The system learns your consumption patterns and optimises charging and discharging schedules automatically.
Weather Forecasting - Some systems check weather forecasts and adjust battery management based on expected solar generation.
Tariff Optimisation - Integration with time-of-use tariffs ensures the battery charges when electricity is cheapest and discharges during expensive periods.
Remote Monitoring - Smartphone apps let you monitor your battery, solar generation, and home consumption in real-time from anywhere.
Grid Services - Some batteries can participate in grid balancing services, earning additional income by supporting the national grid.
1. Energy Assessment - We analyse your electricity consumption, review existing solar generation (if applicable), and discuss your energy goals.
2. System Design - We design a battery storage solution sized appropriately for your needs, selecting equipment that offers the best performance and value.
3. Comprehensive Quote - You'll receive a detailed quotation covering all equipment, installation, commissioning, and certification.
4. Professional Installation - Our qualified electricians install your battery system, typically completing domestic installations in one day. We handle all electrical connections, system configuration, and integration with existing equipment.
5. Commissioning and Setup - We configure your battery for optimal performance, set up monitoring apps, and ensure everything operates correctly.
6. Demonstration and Handover - We show you how to monitor and manage your system, explain how it works, and answer all your questions.
7. Certification - You'll receive all necessary documentation including MCS certification, warranty information, and system specifications.
Battery storage offers compelling financial returns through multiple benefits:
Bill Reduction - Using stored solar energy instead of buying from the grid during expensive evening hours provides the primary savings. Typical households save an additional £500-800 annually compared to solar panels alone.
Export Optimisation - Rather than exporting solar energy at 4-15p per kWh, you're avoiding grid purchases at 25-35p per kWh (or more during peak times). The value differential is substantial.
Peak Avoidance - Time-of-use tariffs charge significantly more during peak hours (typically 4pm-7pm). Batteries let you avoid these premium rates entirely.
Tariff Arbitrage - For those without solar, buying at 7-10p per kWh overnight and using instead of 25-35p daytime electricity provides excellent returns.
Most domestic battery installations pay for themselves within 8-12 years, while the batteries typically last 15-20 years or longer, providing substantial lifetime savings.
Modern lithium-ion battery systems are designed for long-term use with minimal degradation:
Typical Specifications:
Battery degradation is gradual and predictable. Even after 10 years, most batteries still retain 80-90% of their original capacity, continuing to provide substantial value.
We only install batteries from manufacturers with proven track records and comprehensive warranty support.
Battery safety is paramount. All systems we install meet strict UK safety standards and are certified for domestic use:
Modern battery systems include multiple safety features including thermal management, overcharge protection, short circuit protection, and fire suppression systems where applicable.
Most battery installations don't require planning permission, falling under permitted development rights. Batteries are typically installed in garages, utility rooms, or external weather-protected locations.
Installation considerations:
We assess the best location during our site survey, ensuring optimal placement for performance, safety, and convenience.
While there's currently no direct government grant for battery storage, the systems qualify for 0% VAT on installations including new solar panels (as part of an energy-saving materials scheme). Battery-only retrofits currently attract standard VAT rates.
Additionally, many energy suppliers offer preferential tariffs for homes with battery storage, recognising the grid support benefits these systems provide.
Battery systems require minimal maintenance but benefit from monitoring to ensure optimal performance:
Included Monitoring:
Maintenance Requirements:
Most batteries are designed for "fit and forget" operation with no routine maintenance required.
Based in Longfield, Kent, Deltawatt Ltd installs battery storage systems across Swanley, Orpington, Sevenoaks, Gravesend, and throughout Kent and South East London.
Battery storage is often the first step in a comprehensive energy upgrade. Consider combining with:
Solar Panels - If not already installed, adding solar maximises battery value and provides energy independence.
EV Charging - Charge your vehicle with stored solar energy, completing your transition to clean energy.
Smart Home Systems - Integrate battery management with whole-home energy control for maximum efficiency.
Heat Pumps - Future-proof your heating by using stored solar energy to power efficient heat pumps.
As specialists in renewable energy and electrical installations, we can design and deliver complete energy solutions tailored to your goals.
Ready to maximise your solar investment or reduce your energy bills with battery storage? Contact Deltawatt Ltd today for a free, no-obligation consultation and quote.
Our experienced team will assess your property and energy usage, recommend the optimal battery solution, and provide a comprehensive proposal showing your potential savings and return on investment. Whether you're adding storage to existing solar panels or installing a complete renewable energy system, we have the expertise and accreditations to deliver a professional installation you can rely on.
Take control of your energy future with solar battery storage from Kent's trusted renewable energy specialists.
Deltawatt Ltd - MCS certified battery storage installers across Kent and South East London. RECC approved with over 11 years of experience delivering professional renewable energy solutions that maximise savings and energy independence.
We're trusted electrical and renewable energy specialists serving Kent and South East London with over 11 years of experience.
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NAPIT, Trustmark & MCS accredited
Experienced, qualified electricians
High-quality materials and workmanship
Competitive pricing with no hidden costs
From initial consultation to project completion, we ensure every job is completed safely, efficiently and to the highest standard.
Free, no-obligation quotations
Clean, professional service
Fully insured and certified
Customer satisfaction guaranteed
Whether you need a rewire, solar panels, or an EV charger, our experienced team is ready to help with safe, efficient solutions.
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