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Charging [DC kWh] discrepancy
- Thread starter vardhanr
- Start date
Teslamate may be reporting energy added to the battery. The Chargemaster measures electricity consumed.
The gap is energy lost in the car’s charger converting AC into high voltage DC, car electronics, possibly energy used to heat the battery, and energy lost in the battery as the DC current drives the chemical reactions that store the energy.
There is no recognised billing standard for DC charging. You are probably being billed for the total AC consumed. There are losses in the conversion from AC to DC. It always strikes me as a little bizarre that there is no incentive for the charger manufacturers to use efficient transformers.
LukeUK
Member
Most suppliers charge you for the AC that the charger consumes, not the energy that is added to the battery. A DC charger won't achieve 100% efficiency and the car's onboard chargers don't either, if you're charging using type2, rather than CCS.
The car will also consume power whilst charging, especially if you're sat in it watching netflix etc. whilst you charge.
The car will also consume power whilst charging, especially if you're sat in it watching netflix etc. whilst you charge.
Jason71
Well-Known Member
just another good reason to use superchargers. They only charge for the DC that the car receives potentially equivalent to a 10-15% saving as compared to other DC chargers. Need to take that into account when comparing prices between superchargers and other DC rapids.
