A year after moving into a UK bungalow, Andrew Till of the Mr. EV channel sat down to count what his rooftop solar and home battery have actually returned, and to be honest about the calls he might have made differently. The setup is sizable: 30 panels on an east-west roof rated at 13.5 kW peak, paired with two Alpha ESS batteries and inverters wired in parallel for roughly 20 kWh of usable storage and a combined 10 kW of inverter output. He says the system has saved and earned around 3,000 pounds across its first year, installed through Heatable in spring 2025. He frames the video not as a list of complaints but as a walk through the choices a first-time buyer rarely gets to second-guess in public.
What makes the video useful for anyone shopping right now is the cold-weather detail buyers tend to skip. Till mounted his batteries outdoors, and he reports that when temperatures fell to around minus three the pack stopped charging and discharging for roughly three days until it warmed up. That behavior is not unique to his hardware. Lithium iron phosphate cells, the cobalt-free chemistry now common in home storage, are generally not rated to charge below about freezing, which is why outdoor installs in cold climates increasingly ship with built-in heaters. He notes the older Alpha ESS unit he bought lacked one and the current version includes it, so the specific problem he hit is already being designed out. It is the kind of trade-off a glossy quote rarely spells out, and it argues for asking where a battery will physically live before signing.
On capacity, Till is blunt about the math. He says his electric radiators pulled 1,451 kWh in January alone, an average near 47 kWh a day, so a 20 kWh battery was routinely empty by late morning. Doubling storage to 40 kWh would have helped, but he reports a Heatable quote of about 8,000 pounds for that upgrade, which he could not justify on payback. He also walks through a reporting quirk he attributes to his parallel inverter setup, a power-cut gateway that Alpha is only now releasing, and a 10 kW export limit that caps what extra panels could earn in summer. On the upside, he says a recent app update shows numbers he trusts more, a record day of 72 kWh generated, and a payback he now estimates at under six years.
Bottom line: This is the rare solar review that tells you where the system falls short, and those gaps are the useful part. If you have electric heating and cold winters, the lessons here are clear: size the battery for January rather than July, ask whether the pack has a heater before you let it live outdoors, and treat the headline savings as a starting point, not a guarantee. For most buyers the panels still pay, but the storage is where the planning has to happen.
Commentary on a third-party video. Figures and claims are as presented in the source and have not been independently verified. Spotted an error? Tell us and we will correct it.