No, you don’t need a battery to have solar panels. A solar-only system will still cut your daytime electricity bills and can earn you money by exporting unused power through the Smart Export Guarantee (SEG). But a battery can store your daytime surplus for the evening, reducing how much you buy from the grid. Whether it’s worth it depends on how your home uses energy.
For homeowners across Hampshire, from Basingstoke and Winchester to Fleet, Farnborough and Andover, the right answer depends on your roof, electricity usage, tariff and future plans for an EV or heat pump. At Rawlings Renewables we help you choose the right solar panel and battery storage setup for your lifestyle, not a one-size-fits-all package.
What does a solar battery actually do?
Your panels generate electricity during the day. Your home uses what it needs, and the rest is exported to the grid. A battery storage system captures that surplus and releases it in the evening, overnight or on dull days, when you’d otherwise be buying electricity.
A typical home without a battery uses roughly 30–40% of the solar electricity it generates. With a battery, that can rise to around 70–80%. The exact figure depends on your household and system — the Energy Saving Trust’s battery storage guide is a good independent starting point.
Can solar panels work without a battery?
Yes, and for many homes that’s a sensible choice. Solar-only systems have a lower upfront cost and a simpler installation. If you’re considering solar panel installation in Hampshire, they work especially well if you’re home during the day — working from home, running the washing machine, or charging an EV at midday.
The trade-off is that you’ll still buy electricity in the evening, and SEG export rates are usually lower than what you pay to import power.
When is a battery worth adding to solar panels?
A battery tends to pay off when you use a lot of electricity outside daylight hours, or when your tariff rewards shifting usage. These are the situations where we most often recommend one:
| Your situation | Is a battery usually worthwhile? |
|---|---|
| High evening or overnight usage | Yes — stored solar replaces expensive grid power |
| Low daytime usage (out at work) | Often yes — more surplus to store |
| Time-of-use tariff | Yes — charge cheaply off-peak, use at peak times |
| Home EV charging | Often yes — supports off-peak and solar charging |
| Heat pump installed or planned | Often yes — helps shift usage, though not a complete answer in winter |
| Need power-cut protection | Yes, if the system is backup (EPS) enabled |
| Mostly daytime usage | Maybe not — solar-only may already deliver strong value |
Not sure whether a battery suits your home? We can review your electricity usage, roof, tariff options and future plans before recommending a system. Request a solar and battery storage assessment
When might you not need a solar battery?
Honest advice matters, so here’s when we’d often suggest holding off:
- Most of your electricity is already used during daylight hours.
- Your budget is tight and you’d rather start with solar alone.
- Your annual consumption is low, or your solar array is small.
If you may want a battery later, ask your installer about a future-ready inverter and a compatible setup. Retrofitting is usually possible, often with an AC-coupled battery, but it’s simpler and cheaper when planned from the start.
What size solar battery do you need?
Battery size should follow your evening and overnight electricity use, not just your panel capacity. As a rough guide:
- Smaller homes, lower usage: around 5 kWh usable capacity
- Typical family homes: around 7–10 kWh
- High usage, EV or heat pump: 10 kWh or more, or a modular system you can expand
Your smart meter data, roof orientation, array size and future plans all feed into the right answer, which is why a proper survey matters more than any rule of thumb.
Will a solar battery work in a power cut?
Not automatically. Only batteries with backup functionality — often called EPS — and the right installation configuration can supply power during an outage. Typically this covers essential circuits such as the fridge-freezer, lighting, internet and selected sockets. Whole-home backup is possible but requires a more robust design and a higher budget. We see it as a valuable optional extra rather than the main reason to buy.
Should you add a battery if you have a heat pump?
Solar and air source heat pumps pair well, but let’s be realistic. Solar output is lowest in winter, exactly when heat pump demand peaks, so a battery won’t power your heating on its own. It can still help by storing daytime solar, charging on cheap off-peak rates and shifting hot-water and evening loads.
It’s worth knowing that the Boiler Upgrade Scheme covers heat pumps only — it does not fund solar panels or battery storage. If you’re weighing up a heat pump, our guide on whether now is the right time to invest in a heat pump is a good place to start, and you can also read about the Boiler Upgrade Scheme grant for oil and LPG homes.
How much does a solar battery cost in the UK?
Battery prices vary with usable capacity, chemistry and warranty, inverter compatibility, installation complexity and whether you need backup. Savings depend on your import and export rates, evening usage, solar generation and any EV or heat pump load.
| System option | Typical upfront consideration | Main benefit |
|---|---|---|
| Solar panels only | Lower upfront investment | Daytime bill savings and SEG export income |
| Solar panels + 5 kWh battery | Moderate additional investment | Better evening self-use and lower grid imports |
| Solar panels + 10 kWh battery | Higher investment, suited to larger households | More storage, potential backup option and greater flexibility |
The right system depends on your home, usage pattern and tariff, not a generic package. No honest installer can promise a fixed saving without looking at your property, so we provide a tailored estimate after your survey.
Solar battery storage for Hampshire homes
Every property across Hampshire is different. A Victorian terrace in Winchester, a newer estate home in Basingstoke, a detached house in Fleet or Farnborough, or a rural property near Andover will each have different roof orientation, shading, electrical set-up and household routines. You can see all the towns we cover on our areas page.
Our assessments look at:
- Roof direction, pitch and shading
- Your current usage and tariff
- Existing electrical set-up and inverter compatibility
- Plans for an EV or heat pump
From there we recommend whether solar-only or solar plus battery gives you better value. We’ll tell you plainly if a battery isn’t worth it for your home. As a local, family-run, MCS certified renewable installer, we also support you after installation.
FAQs: solar panels and battery storage
Is a solar battery worth it in the UK? It’s often worthwhile if you use substantial electricity after 4pm, have a time-of-use tariff, or regularly export surplus solar power. It may be less cost-effective for homes with low overall usage or high daytime consumption.
Can I add a battery to my existing solar panels? Usually, yes. An AC-coupled battery can often be added to an existing solar PV system, subject to inverter compatibility, electrical capacity and installation requirements. A site survey will identify the most suitable retrofit option.
Do solar batteries work during a power cut? Only if the battery system includes backup functionality, often called EPS, and is installed with the appropriate configuration. It may power essential circuits such as lighting, sockets, internet and refrigeration rather than every appliance.
Can a solar battery charge from the grid? Yes. Many modern batteries can charge from the grid during cheaper off-peak periods and discharge during more expensive periods, depending on your tariff and system settings.
Do I need a battery if I have a heat pump? Not necessarily. A battery can help you use solar electricity more effectively and shift consumption to cheaper tariff periods, but it will not fully cover winter heat-pump demand when solar generation is low.
How long do solar batteries last? Most quality home batteries are designed to last around 10–15 years, although actual lifespan depends on usage cycles, depth of discharge, temperature and the manufacturer’s warranty.
Book a free solar and battery survey
Every home uses electricity differently. Rawlings Renewables will assess your roof, energy usage, tariff options and future plans to recommend the setup that makes sense for you. Call us on 01256 268500, or request a solar and battery storage quote and we’ll come back to you.