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“My only regret is not getting a bigger inverter.”
Photo Credit: iStock
A U.K. homeowner comparing solar quotes found that adding an 11.52-kilowatt-hour battery for £2,330 more (about $3,121 at current exchange rates) was difficult to justify on paper, with a payback period of roughly 13 years based on self-consumption alone.
Commenters who already own solar systems said the picture can look very different once tariff strategy enters the equation.
The homeowner laid out the question in a Reddit thread, saying the household in the northwest uses about 3,549 kilowatt-hours of electricity a year. The post also noted that two adults are usually home during the day and that they may add an electric vehicle and an air-source heat pump in the future.
The main comparison was between two quotes: Option A at £6,090 ($8,164) for 15 panels and a 6kW hybrid inverter, and Option B at £8,420 ($11,287) for that same setup plus an 11.52-kWh battery.
In the homeowner’s calculations, the bigger battery would boost yearly solar self-consumption from 1,275 kWh to 3,109 kWh. Using electricity imports at 25 pence (33 cents) per kWh and exports at 15 pence (20 cents) per kWh, they calculated the added benefit at about £180 ($241) per year.
“At present, I’m leaning towards the £8,420 package, although the £6,090 solar-only option is tempting,” the original poster wrote.
For homeowners running similar numbers, EnergySage can help compare home battery storage options, including competitive installation estimates. EnergySage has teamed up with electrification brand Qmerit to help homeowners get the best price on home battery storage solutions.
In the replies, several people said that the payback estimate was incomplete because it left out the value of time-of-use charging. “Think of the battery as an overspill,” one commenter wrote, explaining that extra solar would otherwise be sold cheaply or wasted, while a battery lets you use stored solar or off-peak electricity during pricier parts of the day.
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Tariff examples came up repeatedly. One commenter said a battery can let households “lock in 9p (12 cents) electric if you charge it off peak,” on Octopus Go, while another described using Octopus Flux, with 30 pence (40 cents) per kWh during the 4-7 p.m. peak window, then recharging the battery overnight when imports cost 15 pence (20 cents).
That same commenter summed up their main frustration, writing, “My only regret is not getting a bigger inverter.”
The possibility of adding more electric demand later also shaped the advice. One commenter said an EV would create “big synergies with a battery,” and another said a 10-kW heat pump in their home works off a 16-kWh battery and 6-kW inverter “and it does fine.”
That means a battery that seems large for the home’s current usage could look more reasonable if the household later moves more of its driving and heating onto electricity.
Taken together, the replies suggested comparing battery value against the tariff a household expects to use, rather than only measuring stored solar against exported solar. Commenters also said it is worth asking installers about inverter sizing if an EV or heat pump may be added later.
One person also advised bird-proofing the array during installation, saying it can cost more to add afterward.
Some commenters also pointed to backup power as part of storage’s appeal; one said that with a gateway system, “it can mean your house through a powercut.”
For readers who want backup without jumping straight to a fixed whole-home system, Pila offers another strong option, and its plug-and-play batteries cost a fraction of what a whole-home backup system would.
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© 2025 THE COOL DOWN COMPANY. All Rights Reserved. Do not sell or share my personal information. Reach us at hello@thecooldown.com.

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