Walk enough of Intersolar in Munich and one product starts repeating itself. UpsideDownFork spent two days at the 2026 show covering the stands that did not warrant their own video, and the same product kept turning up in the corner of one stand after another: a small stackable solar and battery kit built to plug into a domestic socket. Continental Europe calls it balcony solar. The host says the UK has settled on plug-in solar as the term. Dyness, Aferiy and GoodWe all had versions, built to the same recipe of a controller with an inverter on top and battery modules underneath that you add to over time. A couple of years ago this was a German curiosity. At this show it looked like table stakes.
The pitch for all of these is identical: start small, add capacity later. Whether that promise is worth anything comes down to a question the marketing rarely answers, which is whether next year's module will still talk to this year's controller. It came up on the Dyness stand. The host says the first thing he asked about the new Power Box G3 was whether it was compatible with the G2 already installed at his house, and that the answer was fully backwards compatible, which would let him take a 20 kWh system to 30 or 40. That is a real commitment and not a universal one. Modular battery ranges do not always carry compatibility across a generation change, and a buyer who bought into the scale later story can find the ladder has been pulled up. Our earlier coverage from this same show noted panel makers pushing standard sized residential panels toward the 500 watt mark, so the hardware underneath these systems is moving quickly too.
The tour itself is a useful snapshot of who is selling what. EVE Energy showed automotive and stationary cells, including the MB31 LFP cell the host describes as a familiar building block in DIY packs. Dyness had the stackable DS balcony system, a tower battery range, hybrid inverters including a Victron unit, an R290 heat pump, and the Power Box G3, whose upgrades over the G2 he lists as improved handles and terminals moved from the top to both ends so units can be daisy chained. SAJ, whose HS3 he has at home in a 10 kWh configuration with an EV charger module and energy manager, is bringing a larger HS5. Aferiy showed its P210, P280 and P310 power stations, a 400 W folding panel, a new stackable balcony storage system, and a Nomad 1800 Pro he says is coming to the UK.
GoodWe had the largest stand he visited, showing its ESA all-in-one system with a home energy management controller and a DC heat pump. GCL was showing back contact panels with no visible front conductors, plus large format 640 W and 655 W modules. On disclosure, the host states at the top of the video that none of the content is sponsored, and separately says GCL has agreed to donate panels for an upcoming project on his channel. He discloses both on camera.
Bottom line: plug-in solar has stopped being a hobbyist category and started being a product line, and the consequence is that the differences between brands are getting thin. When three brands in one afternoon sell the same stacked box, the thing worth paying for is not the spec sheet, it is the promise that the box you buy this year still works with the one you buy in 2028. Dyness went on record with that answer. Ask every other brand the same question before you commit, and treat a shrug as a no.
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.