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“Wouldn’t trust any of their data except the smart meter ones.”
Photo Credit: iStock
An Octopus Energy customer in the U.K. thought a new 6-hour EV charging cap had caused household electricity use to skyrocket. But after checking the bill, the customer said the app display — not the household’s billed consumption — appeared to be the real problem.
In a Reddit thread, the customer said the home runs on a combination of solar panels, battery storage, a heat pump, and an electric vehicle. They also said they were not charging the car outside the capped six-hour period.
Referring to the apparent jump that started after Aug. 27, they wrote, “We haven’t changed the way we use anything.” After other users responded, the poster updated the thread with a different conclusion: “Problem solved. Don’t trust the app, trust the bill.”
That edit suggested the issue was with how the app presented the data, not with a comparable rise in billed electricity use.
A commenter said they were seeing the same thing: “There’s data missing from previous months so not a true reflection of usage, mine is showing the same,” before adding, “Look back at your monthly billing and you’ll see this straight away.”
When an app makes it look like electricity use has suddenly tripled, people can panic or start changing charging routines even if the bill shows nothing close to that increase.
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The poster shared a specific example that deepened their doubts about the app figures. They said June showed 117kWh in the utility app versus 380kWh on the inverter. That example suggested the app figures didn’t match the inverter data, indicating the mismatch may have been in the display rather than the home’s actual consumption.
Other commenters said a display issue would not necessarily explain every increase. One commenter argued that the household’s earlier figures may already have been implausibly low, writing, “Sub 200kWh TOTAL usage with a heat pump in January shouldn’t be possible,” especially given that the home also used portable air conditioning in summer.
Another commenter pointed to colder weather and added hot-water demand as possible reasons for a genuine rise.
Even if EV charging stays in the same overnight window, homes with heat pumps can still see higher electricity demand as seasonal heating needs increase.
Before assuming the spike was real, commenters urged the poster to compare the app with monthly bills and smart-meter readings. The poster wrote, “Wouldn’t trust any of their data except the smart meter ones.”
They also checked a second source — the solar inverter app — and that comparison exposed the June mismatch between 117kWh and 380kWh.
In a home balancing solar, battery storage, a heat pump, and an EV, verifying usage against another source can stop phantom data from driving cost worries before the bill arrives.
Commenters also said the cap itself should not automatically be treated as the cause. In this case, that meant checking whether heating or hot-water use changed after Aug. 27, while also looking at whether EV-related colors in the chart were being sorted inconsistently.
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