40 amp vs 48 amp charger for a Toyota bZ
For the trims below, EPA data shows the car accepts more than a 40 A charger delivers (9.6 kW). A 48 A charger (11.52 kW) saves up to about 1.4 hours on an empty-to-full charge (estimate). It needs a 60 A breaker instead of 50 A.
Per trim
| Trim | Empty→full at 40 A | Empty→full at 48 A | Miles per 8 h at 40 A | Miles per 8 h at 48 A | Why we think it accepts more |
|---|---|---|---|---|---|
| 2027 bZ (energy capacity 200 Ah) | 6.3 h | 5.3–6.0 h | 298 mi | 357 mi (max) | EPA 240 V time implies an average of 10.1 kW, so it must accept more than 9.6 kW at times |
| 2026 bZ LIMITED (energy capacity 200 Ah) | 8.5 h | 7.1–8.0 h | 279 mi | 335 mi (max) | EPA 240 V time implies an average of 10.2 kW, so it must accept more than 9.6 kW at times |
| 2027 bZ Woodland AWD 235/60R18 | 8.5 h | 7.1–8.0 h | 265 mi | 318 mi (max) | EPA 240 V time implies an average of 10.2 kW, so it must accept more than 9.6 kW at times |
Estimates: energy for the full EPA range (kWh/100 mi × range ÷ 100, at the wall) ÷ charging power. Where EPA states the onboard charger we cap at it. Otherwise the 48 A figure is a range: from full 11.52 kW down to the average power implied by EPA's 240 V time, because the true onboard limit isn't in EPA data. Real charging tapers near 100%. Vehicle data: fueleconomy.gov.
For the other 6 trim(s) EPA data doesn't show more than 9.6 kW being accepted, so a 48 A charger may not help them: 2027 bZ (energy capacity 191 Ah), 2027 bZ LIMITED, 2026 bZ LIMITED (energy capacity 191 Ah), 2027 bZ AWD, 2027 bZ AWD LIMITED, 2027 bZ Woodland AWD 235/65R18.
Does it matter day to day?
Most drivers plug in overnight and rarely charge from empty. Both chargers add 298+ miles in 8 hours for the most efficient qualifying trim. The 48 A option mainly helps with long daily drives, short charging windows on time-of-use plans, or sharing one charger between two cars. The bigger circuit can cost more to install (wire size, panel capacity), and that cost isn't in our data.
Certified chargers at each size
ENERGY STAR lists 20 featured 40 A and 26 featured 48 A chargers: 40 A chargers · 48 A chargers · breaker sizes. Most can be set to a lower current if your panel can't supply 60 A.
All Toyota bZ charging times · Calculator
Not electrical advice; use a licensed electrician.