Solar Battery vs No Battery for a Holiday Let: Which Pays?

Quick answer

For most UK holiday lets, a battery is worth adding. The loads that define a let, the hot tub, evening hot-water re-heat and evening guest EV charging, largely fall outside peak sun. A battery stores midday generation and releases it after dark, capturing value that a panels-only system would export cheaply and then re-buy at peak. The exception is a property whose load is genuinely daytime-only, on a tight budget.

Key takeaway: this is not a general question about batteries. It is specific to the holiday-let load shape. Because a let’s biggest loads are evening and overnight (a hot tub kept ready for new arrivals, guests charging a car after a day out), the battery has more to do here than on a typical daytime-empty home.

The two options, side by side

	Panels only	Panels plus battery
Upfront cost (cottage)	Lower, roughly £5,000 to £11,000	Higher, roughly £7,000 to £16,000
Daytime hot-tub and hot-water load	Covered directly	Covered directly
Evening hot-tub re-heat for new arrivals	Bought from grid at peak	Run from stored solar
Evening or overnight guest EV charging	Bought from grid	Run from stored solar
Off-season surplus	Exported under SEG	Exported under SEG after battery is full
Self-consumption (in season)	Moderate	High
Indicative payback	Similar or slightly faster on paper	Similar, but captures more real value on a let
Off-grid or weak-grid site	Not viable alone	Essential

The row that decides it for a holiday let is the evening one. On a home that sits empty all day, panels-only self-consumption is low and a battery is often what rescues the payback. On a holiday let the daytime load is already high, so panels-only does better than it would on a home, but the evening load, the hot tub re-heated for tomorrow’s guests and the EV charging overnight, is exactly what the battery captures.

Why the holiday-let load shape favours a battery

Three loads define a self-catering property, and two of the three peak outside daylight.

The hot tub runs through the day (solar covers it directly) but also needs re-heating in the evening and overnight so it is hot and filtered for a fresh changeover the next morning. That evening re-heat is prime battery territory.

Hot-water re-heat at changeover often happens as guests leave in the morning and new ones arrive in the afternoon, but the cylinder holds heat into the evening, and the overnight top-up is battery-served rather than grid-bought.

Guest EV charging is the clearest case. Guests arrive, go out for the day, and plug in overnight. A 7 kW charger drawing from a battery of stored midday sun rather than peak-rate grid electricity is where a chunk of the return sits. We cover this pairing in our EV charging for guests guide.

Stat callout: Without a battery, a typical domestic array self-consumes only around 30 to 50% of what it generates, exporting the rest cheaply (Source: Energy Saving Trust, energysavingtrust.org.uk). On a holiday let, high daytime demand lifts that, and a battery lifts it further by moving evening loads onto stored solar rather than the grid.

A worked comparison (illustrative)

Consider the same coastal cottage, with and without storage. Both fit a 6 kW array. This is an illustrative model, not a quote.

• Panels only. The array covers the daytime hot-tub filtration and the midday hot-water re-heat directly. But the evening re-heat that keeps the tub ready for tomorrow’s guests, and any overnight EV charging, are bought from the grid at peak rate. Midday surplus is exported cheaply under the Smart Export Guarantee, then partly re-bought a few hours later at a higher price.
• Panels plus a 10 kWh battery. The same daytime loads are covered, but now the midday surplus fills the battery instead of being exported. That stored solar runs the evening tub re-heat and the overnight EV charge, so the peak-rate grid purchase largely disappears. The battery costs more upfront, but on a let it works most nights of the busy season, which is why the value is real rather than theoretical.

The precise payback depends on your tariff spread between peak and export rates. The wider that gap, the more the battery earns, and it is currently wide.

Remote monitoring: a battery you can watch from anywhere

Many holiday-let owners are absentee, running the property from another county. A battery system comes with app-based monitoring, so you can see generation, storage state and consumption remotely, spot a fault before a guest reports it, and confirm the hot tub is drawing from solar rather than the grid. For an owner who is not on site between changeovers, that visibility is a genuine operational benefit, not just a gadget.

When to skip the battery

Being honest about the limit: a battery is not automatically right.

• A genuinely daytime-only let with no hot tub, no evening EV charging and gas heating self-consumes most generation in the moment. The battery has little to store, and payback stretches.
• A tight capital budget where the battery pushes the project past what you can fund. A panels-only system that gets installed beats a panels-plus-battery system that stays on the drawing board. You can add storage later.
• A property you plan to sell soon, where you cannot recover the extra capital through the sale price inside your hold period.

For everything else, particularly a hot-tub cottage off the gas grid, the battery earns its place.

The off-grid case: a battery is not optional

For a glamping site or remote cottage on a weak or non-existent grid supply, this is not a comparison at all. Solar-plus-battery is the system. It powers lighting, hot water, pod heating and any shower block directly, with storage carrying the site overnight and through cloudy spells, and sometimes a small backup generator for worst-case weeks. Here the battery is weighed not against a grid bill but against the cost and lead time of a DNO grid extension, which it frequently beats outright. We cover this fully in our off-grid versus grid-connected glamping solar comparison, and on the glamping sites page.

How this plays out by property type

• A self-catering cottage with a hot tub is the classic battery case, store midday sun for the evening re-heat.
• A lodge or cabin has limited roof space, so time-shifting stored generation matters even more.
• A self-catering park may use larger storage to serve shared reception, laundry and amenity loads and evening guest charging.

You can compare all the sizing on the main solar panels for holiday lets page and model your own numbers on the cost guide.

Grid and export notes

An MCS-certified system qualifies for the Smart Export Guarantee, so a battery does not stop you earning export income, it simply fills first and exports the surplus. A battery-plus-EV system usually needs a G99 application to the DNO rather than a simple G98 notification, which we handle as part of the design. The tax treatment of the whole install changed with the abolition of the Furnished Holiday Lettings regime in April 2025, so take your own tax advice, and see our grants and funding page.

Frequently asked questions

Does a battery stop me earning export income?

No. A grid-connected battery fills from surplus solar first, then exports whatever is left over, so you still earn under the Smart Export Guarantee, you just export less because you are self-consuming more of the value.

How big a battery does a holiday cottage need?

Indicatively 5 to 10 kWh for a single cottage, sized to your evening and overnight load rather than a default figure. A hot tub kept ready for changeover and any overnight EV charging push you toward the upper end.

Can I add a battery later?

Usually yes, if the array and inverter are specified with that in mind. Sizing for a future battery from the start is cheaper than retrofitting an inverter that cannot support one.

Is a battery worth it if I have no hot tub and no EV charging?

Often not. Without evening loads to time-shift, a panels-only system that self-consumes daytime generation may be the better value. This is one of the genuine cases where we would advise skipping storage.

We design battery-backed holiday-let systems across the UK, from the Yorkshire Dales around Grassington to Lake District lodges near Windermere.

The verdict

For a typical hot-tub holiday let, add the battery. The evening and overnight loads that define the sector are precisely what it captures. Skip it only on a daytime-load, budget-constrained or short-hold property, and even then, size the array so a battery can be retrofitted later.

Related reading: are solar panels worth it for a holiday let and the cost breakdown for a holiday cottage.

The right answer is the one modelled from your own load pattern. Request a free quote and we will show you the payback with and without a battery, side by side.