Flagship long-range sedans, sized for solar
The Xiaomi SU7 Max and the Mercedes EQS 450+ are both flagship long-range electric sedans, and on paper they're remarkably close. The SU7 Max uses 14.6 kWh/100km against the EQS's 15.7 kWh/100km — about 8% less energy per 100km — while their batteries (101 kWh vs 108 kWh) sit within touching distance — and on range the EQS's 782km WLTP figure slightly outreaches the SU7 Max's ~690km WLTP-equivalent estimate. For solar sizing, though, that modest efficiency edge for the Xiaomi is what separates them, since it's consumption rather than battery size that sets panel count.
Availability note: the Xiaomi SU7 Max isn't officially on sale in the EU yet and has no WLTP homologation. Its range here is a WLTP-equivalent estimate converted from China's CLTC rating, so it lines up fairly against the EU-rated Mercedes it's compared with.
Based on 15,000 km/year — adjust the distance below to match your driving.
EQS comes out ahead overall (1 of 2 metrics), though SU7 Max isn't far behind.
Enter your address and driving habits — the results above update with real solar data.
Common Questions
Their consumption is close (14.6 vs the EQS's 15.7 kWh/100km), so the two need a similar-sized solar array — with the SU7 Max needing marginally fewer 440 W panels thanks to its slightly lower consumption. VoltSun calculates the exact count for your address below.
On our database figures the SU7 Max is a touch more efficient at 14.6 kWh/100km versus the EQS 450+'s 15.7 kWh/100km — roughly an 8% advantage, though both are impressively frugal for such large, long-range sedans.
Panel count follows consumption, not battery size — but here the two happen to line up on both. The SU7 Max's 101 kWh and the EQS's 108 kWh are close, and with similar consumption they end up needing a comparable solar system for the same mileage.
Only marginally — its slightly higher consumption means a same-size solar array covers a fraction less of its charging. Over a year the difference is small next to your electricity price and how far you drive.