200+
Battery storage that actually makes financial sense
A battery only makes sense when the numbers add up. We model your usage, your tariff, and your solar generation (if you have it) to recommend the right size - or tell you honestly if you should wait. Installed neatly, commissioned properly, with a clear Evidence Pack showing exactly what was done.
Over 200 local installs across Exeter and Devon
5.0*
10yr
It's as easy as...
1. Online estimate
Answer a few quick questions about your home and goals. No obligation.
2. Quick call (optional)
Talk it through honestly with no pressure and no sales script.
3. Free site survey
We check roof condition, shading, and electrics using satellite mapping and on-site assessment to model your roof.
4. Design and quote
Clear proposal and fixed price quote with expected performance and every assumption explained.
5. Install
We install the system neatly, then complete commissioning and Evidence Pack handover. We follow up to confirm everything is working as expected. Typical on-site install takes 1 week.
6. Evidence Pack
You receive a complete handover pack (photos, certificates, commissioning record, settings & warranties).
Sized for your usage. Configured for your tariff.
We don't sell oversized batteries. Every system starts with how and when you use energy - then we size the battery to maximise your return, not our invoice. If a battery won't pay back, we'll tell you.
How home battery storage actually works
A home battery stores electricity so you can use it when you need it most - typically in the evening when energy costs are highest. If you have solar panels, the battery captures what you'd otherwise export during the day. If you don't have solar, the battery charges from the grid overnight when electricity is cheapest, then powers your home during expensive peak hours. Either way, you use less from the grid when it costs the most.
Get my free estimateAssumptions: Savings estimates are based on typical UK residential usage with a 5-10 kWh battery and vary by home, tariff, and setup. We model this for your property after survey.
You don't need solar panels to benefit from a battery.
On a time-of-use tariff (like Octopus Flux or Intelligent Go), a battery alone can save money by charging off-peak and discharging at peak times.
A battery can double your solar self-consumption.
Without a battery, many homes use 30-50% of what panels generate. With correct sizing, that can rise to 60-80%.
Batteries don't need a separate room.
Modern wall-mounted units are compact and designed for garages, utility rooms, and suitable exterior walls.
Residential battery installations are currently 0% VAT.
Qualifying domestic installs are currently zero-rated. We confirm applicability for your property.
Battery warranties typically cover 10 years.
Most manufacturers guarantee minimum retained capacity (usually 70-80%) over 10 years.
What a battery can do for your home
A battery can transform how you use electricity - but only if it's sized correctly and configured for your tariff.
Use more of your solar
A correctly sized battery can increase self-consumption from around 40% to around 80%.
Shift usage
Typical savings are around £150-£480 per year for battery-only setups, or £1,000-£1,880 per year when paired with solar (indicative).
Avoid peak pricing
Charge overnight when rates are typically 5-10p/kWh, then discharge during peak periods often around 30-40p/kWh.
Measurable results
Monitoring setup is included so you can track generation, storage, import, and export in one place.
Future ready
Battery settings can be tuned alongside EV charging, retrofit work, and tariff switching as your setup evolves.
Why homeowners across Exeter and Devon choose us for battery storage
Most installers sell you the biggest battery they can. We start with your usage, your tariff, and your goals - then size the battery to deliver the best return.
1. We'll tell you if a battery isn't worth it
If your usage pattern, tariff, or setup means payback does not stack up, we'll say so clearly before you spend anything.
2. Sized for your usage, not a standard package
We model daily consumption and tariff windows to recommend capacity that fits your household - not a default upsell.
3. Commissioning and tariff configuration included
Charge windows, discharge schedules, export settings, and monitoring are configured for your tariff as part of standard delivery.
4. Evidence Pack handover
You receive install photos, commissioning record, configured settings, certificates, and 10-year warranty details.
5. Quality equipment from trusted manufacturers
We install proven systems from GivEnergy, Tesla Powerwall, Sigenergy, and Fox ESS.
6. Retrofit specialists
We regularly add batteries to existing solar systems and reconfigure controls so the whole system works as one.
Don't take our word for it
Rated 5.0 out of 5 on Google - 50 reviews from homeowners across Exeter and Devon.
Get my free estimate5/5
We weren't sure if a battery was worth it. They ran the numbers for our tariff and showed us exactly where the savings would come from. Really straightforward process from start to finish. Super pleased!
Helen T.
Exeter
3-bed terraced, Victorian terrace
5/5
The battery has completely changed how we use electricity. We charge overnight on a cheap tariff and barely import during the day. The monitoring makes it easy to see what's happening. Wish we'd done it sooner.
David R.
Newton Abbot
4-bed detached, tile roof
5/5
Already had solar panels from another installer, but they never set up the battery properly. Watt & Waves reconfigured everything for our tariff and now we're actually seeing the savings we were promised originally. Professional and honest.
Karen P.
Tiverton
3-bed semi, slate roof
Recent projects across Exeter and Devon
Real installs, real workmanship. Every project follows the same process: survey, design, install, commission, and finishes with an Evidence Pack.
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Spread the cost
Solar is a significant investment. We want to make it accessible.
Kanda
Finance available from Kanda - subject to status and affordability checks. Spread the cost over 5-10 years with monthly payments from £89 to £165 per month.
From £89 to £165per month
Finance is subject to status, affordability, and lender criteria. We are not a financial adviser. Representative APR examples are available on request. Finance is provided by Kanda, not by Watt & Waves. We can explain the options, but the decision is yours.
Common questions about battery storage
Ready for your free estimate?
Start your no-obligation estimate and we'll show whether battery storage makes sense for your home.
Ready for a battery estimate designed around your usage?
Start your free, no-obligation estimate. We'll explain whether a battery makes sense, what size you need, and why - with clear numbers and no pressure. Available for homeowners in Exeter and Devon.