Fox ESS & SolaX Battery Storage Solutions
Not every home needs a premium Tesla Powerwall. Many UK households and businesses want affordable, flexible solar battery options that still deliver excellent performance.
Solar battery alternatives to Tesla Powerwall 3 for retrofit. Fox ESS, SolaX. At RRD Energy, we install and retrofit Fox ESS and SolaX batteries — two of the most popular alternatives on the UK market. Both offer excellent value, flexible sizing, and strong warranties, making them ideal for a wide range of customers.
Why Choose Fox ESS or SolaX?
⚡ Fox ESS Batteery for Retrofit
Modular design — expand storage over time as your needs grow
Good balance of performance and price
Smart monitoring options for real-time usage
Warranties of 5–10 years depending on model
Competitive installed costs: from £3,499
⚡ SolaX Battery for Retrofit
Proven reliability with thousands of installs in the UK
Flexible battery sizing (from 3–12 kWh per unit)
Excellent choice for medium energy users
Warranties of 5–10 years depending on battery
Installed costs typically £4,499
RRD Energy provides Battey retrofits
Fox ESS battery retrofits and Solax battery retrofits installations across Northampton and the wider Northamptonshire area, including Daventry, Kettering, Wellingborough, Rushden, Brackley and Towcester.
Retrofit or New Install
Retrofit → Add Fox ESS or SolaX batteries to existing solar panels to store excess energy and reduce grid reliance.
New Install → Combine with PV solar panels for a complete solar + battery system.
Whether you’re upgrading your current system or starting from scratch, RRD Energy ensures your battery system is designed for maximum savings and compliance.
Safety & Standards
Like Tesla, Fox and SolaX batteries must meet new British Standards for safety:
❌ No installs under stairs or in lofts
✅ Suitable locations: garages, utility rooms, or outdoors in protective enclosures
🌡️ Outdoor batteries require weather-protected, heated enclosures to ensure performance in winter
Our installations are MCS certified and fully compliant with UK standards.
Feed-in Tariff (FiT) & Smart Export Guarantee (SEG)
FIT customers: You will still receive your generation payments. Export payments may change depending on metering setup, but the extra savings from storing and using your own solar power usually outweigh reduced exports.
SEG customers: The Tesla Powerwall works perfectly with time-based tariffs, allowing you to export energy when rates are highest.
Warranty & Reliability
Tesla Powerwall 3 comes with a 10-year manufacturer’s warranty.
Typical solar battery warranties are 5–10 years, with up to 12,000 cycles.
Panels already on your roof usually carry 25-year performance warranties.
This makes the Tesla Powerwall 3 one of the most robust long-term retrofit choices on the market.
Tesla Powerwall vs Other Batteries
Tesla Powerwall 3: Premium, whole-home backup, app monitoring, long warranty.
Fox ESS: Modular, cost-effective, flexible sizes, we can do a full home back up subject to home survey.
SolaX: Great mid-range option for households with medium energy use, yes we can do a full home back up.
If you already own solar panels and want the highest-quality retrofit solution, the Powerwall remains the leading choice.
Why RRD for Retrofit Batteries?
🛠️ We do the difficult jobs – complex retrofits, older systems, mixed brands
⚡ Accredited experts – Tesla, Fox ESS, and SolaX certified installers
🏡 Safe & compliant – meeting new UK battery standards every time
💡 Engineer-led – real technical surveys, not sales pitches
FAQs
Q: Which is better, Fox ESS or SolaX?
Both are excellent — Fox ESS is highly modular, while SolaX offers strong mid-range options. Choice depends on energy needs and budget.
Q: How long does installation take?
Most Fox or SolaX retrofits are completed in 1–2 days.
Q: Can I expand later?
Yes — both Fox and SolaX systems allow additional battery modules to be added over time.
Q: Can I get a full home back up with SolaX and Fox batteries?
Yes this is an individual setup for each home and subject to survey.
Q: Do I still get FiT or SEG payments?
Yes — you’ll still receive FiT generation payments, and SEG works with both systems.
Next Steps
Ready to add a Fox ESS retrofit or a SolaX retrofit battery to your existing solar panels?
With RRD Energy, you’ll get:
Fox ESS and SolaX-accredited installers
A full technical survey before installation
Professional setup that meets the latest UK safety standards
Long-term support and warranty management.
Click the link below and fill out the form and we will be in contact with you normally the same day.