Solar Battery Storage
Store what you generate, use it when you need it. Tesla Powerwall, SunSynk, Sigenergy and FoxESS, fitted and commissioned across Norfolk and Suffolk.
Stop exporting power you'll need later.
Solar power you don't use during the day is exported to the grid for a fraction of what you pay to buy it back after dark. A solar battery stores it instead, so you're running on your own electricity in the evening and overnight - not just when the sun's out. It also lets you charge from cheap off-peak grid rates and ride through a power cut if you add whole-home backup. Wave Renewables installs solar battery storage across Norfolk and Suffolk - Norwich, North Walsham and the surrounding area - and every system is fitted and commissioned to the same standard.
- Tesla Powerwall, SunSynk, Sigenergy and FoxESS - supplied and fitted
- Retrofits to most existing solar systems
- Whole-home backup available on all four brands we fit
- 0% VAT on domestic battery installations
Which battery is right for you?
We fit four brands, all with whole-home backup available, and recommend based on your usage and budget. Tap through to compare.
Capacities and prices are indicative, from manufacturer datasheets and UK installer cost guides. Prices include a hybrid inverter where one is needed. We size the battery to your actual daily usage - see sizing below.
What size battery do I need?
The useful size is roughly the amount of electricity you use between sunset and sunrise - that's what the battery covers so you're not buying it at peak rates. Oversizing wastes money on capacity you never cycle; undersizing means you're back on the grid by 10pm.
- Lower usage (1-2 people, ~6-8 kWh/day) - around 5 kWh usable
- Typical family home (~10-14 kWh/day) - around 10 kWh usable
- Higher usage (EV charging, electric heating, home working) - 13 kWh+ usable, or a modular stack
Pairing with an EV charger changes the maths - we'll factor that in.
A battery works both ways.
With solar panels
The battery stores your surplus daytime generation instead of exporting it cheaply, then powers the house through the evening. This is where a battery saves the most, and why most customers pair the two.
Without solar panels
On a time-of-use tariff, the battery charges from the grid when electricity is cheapest (often overnight) and discharges during expensive peak hours. Smaller saving than with solar, but still worthwhile on the right tariff.
Keep the lights on in a power cut.
A standard grid-tied battery shuts down when the grid goes off. Add an EPS (Emergency Power Supply) or an automatic changeover switch and the battery keeps chosen circuits - or the whole house, depending on the setup and battery size - running through an outage, switching over in a fraction of a second so you barely notice. It works with both AC-coupled and DC hybrid inverters. If you're on the end of a rural line or just want the fridge, router and heating to stay on, tell us and we'll size the system for it.
- Automatic or manual changeover - no need to be home
- Single essential circuits or whole-home backup
- Retrofit to many existing solar + battery systems
How it stacks up.
A retrofit battery typically pays back in around 6-10 years depending on your tariff, how much solar you have and how much electricity you use in the evening. Fitted alongside a new solar system the combined payback is usually shorter, because the panels and battery share one inverter and one installation visit. Domestic battery installations are currently 0% VAT.
Battery storage FAQs.
Yes - Wave Renewables installs solar battery storage throughout Norfolk and Suffolk from its base in Bacton, covering Norwich, North Walsham, Cromer, Wroxham, Aylsham, Great Yarmouth and over the border to Lowestoft and Beccles. See areas we cover.
Tesla Powerwall, SunSynk, Sigenergy and FoxESS, with whole-home backup available on all four. We recommend the right one for your usage and budget during your free site visit.
In most cases, yes. We retrofit battery storage to an existing solar system - checking your current inverter is compatible during the site visit, or fitting a hybrid inverter if it isn't.
No. On a time-of-use tariff a battery can charge from cheap off-peak grid electricity and discharge during peak hours. The saving is smaller than with solar but still worthwhile on the right tariff.
Roughly the amount of electricity you use between sunset and sunrise. That's around 5 kWh for lower usage, 10 kWh for a typical family home, and 13 kWh or more if you charge an EV or use electric heating.
Yes, if it's set up with whole-home backup. All four brands we fit support it. Without backup configured, the battery shuts down in a grid outage for safety, the same as solar.
A standalone battery install is typically completed in a day. Fitting alongside a new solar system takes a little longer - we confirm timings at your site visit.
Most come with a 10-year warranty and are rated for thousands of full charge cycles, so 10-15 years of daily use is a realistic expectation.
Capacity and price-tier figures are indicative, from manufacturer datasheets (Tesla, Sunsynk, Sigenergy, Fox ESS) and independent UK battery cost guides (September 2026). We size and price every system on site.
Last reviewed September 2026.
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