Tesla Powerwall Installation in Portsmouth

Yes, particularly with current electricity prices. Without a battery, excess solar energy is exported for just 4–5p per kWh. With a battery, you store that energy and use it in the evening when grid electricity costs 30p+ per kWh — a 6x price difference. A battery typically adds 3–5 years to the solar payback period but significantly increases total savings over the system lifetime.

Home battery storage systems typically cost £3,000–£8,000 depending on capacity. A 5kWh battery suits most homes with a 3–4kW solar system. Larger homes or those with EV chargers may benefit from 10kWh+ systems. All battery installations include 0% VAT when installed alongside or retrofitted to solar panels.

Yes. We regularly retrofit battery storage to existing solar installations. The process involves assessing your current system, choosing a compatible battery, and installing it alongside your existing inverter (or replacing the inverter with a hybrid model). Most retrofits take one day.

Most modern lithium-ion solar batteries are warranted for 10–12 years or a set number of charge cycles (typically 6,000–10,000). In practice, batteries often last 15+ years with gradual capacity reduction. After the warranty period, most retain 60–70% of original capacity.