#HN comments on #solar #energy #pricing pointing out that #Scott-Helme’s setup is amazingly overpriced, in part because of #Tesla and predicting a “bloodbath in that market in the next years”. Also £25420 for three 13.5kWh Powerwalls is £628/kWh or US$840/kWh (my calculations) while actual #pricing of #batteries are US$60/kWh and UL-listed 16kWh prebuilt battery packs are US$3300 (US$210/kWh). “scarecrowbob” reports, “I am writing this off grid, using about 15kwh of #batteries and a $1200 (6kw) inverter. My entire system puls [plus] panels and racking those panels, plus wiring some un-powered shacks was about $10k.” “jstsch” reports, “Just received a 15kWh battery from China. A ‘Humsienk’. Combined it with a GroWatt SPA3000TL-BL inverter. Total price, 1600 euros. So close to the magical 100 euros per kWh. Driving it with some interesting combinations of Raspberry PI’s and serial interfaces and custom written Go code, but it works... :)” “Dylan1312” confirms. 1600€ is US$1900, so that’s US$125/kWh, less than a sixth of the Powerwall price. Meanwhile, “bob1029” says, “The rooftop solar game in Texas is strongly into scam territory.”
on 02026-01-13#Scott-Helme computes that his #UK #solar #energy setup (three #Tesla Powerwalls for £25420 and a £13940 Perlight #Enphase #photovoltaic array of 4.2kWp, which is US$18753 or US$4.46/Wp, roughly 45 times current wholesale solar module #pricing) saved him £3078 in 02025, which at £39360 would be a 7.8% return on investment during that year. But he only had “export capabilities” for 7 months, and he anticipates that the ROI would have been 9.2% if he’d had it all year. No thoughts on what the ROI will be when utility-scale solar drops the cost of grid power and eliminates his export capabilities.
on 02026-01-13