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.
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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 400W 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.