One evening of V2H, fully understood
The car powered the house from 5 to 11 PM, recharged after midnight and is at 80% again.
The household's grid meter shows almost nothing for the evening, and a little more for the night.
The questionCan you explain the evening, from the first kWh out to the last kWh back in?
The evening in seven moments
80% in the driveway, expensive hours ahead: in reverse.
Stop 01last summer, tonight, maybe next year.
Stop 02A DC wallbox converts in both directions.
Stop 03ISO 15118-20 to the car, 2.1 to the energy manager.
Stop 04About 1,200 kWh a year added, at low power.
Stop 05A notification for V2H, more rules for V2G.
Stop 063 kW from the car at the peak, recharged after midnight.
Stop 07
Seven moments, one battery. turns a parked car into storage for the house and, step by step, for the grid.
Where to go from here
Battery storage looks at stationary batteries, Energy and grid integration at the grid around the house, and Plug & Charge at in detail. See all learning paths.
Check your understanding
4 questions. Answer all of them to complete this stop. Each answer explains itself.
What did the car do between 5 and 11 PM?
The house drew its load from the car, behind the meter; that is V2H.
Which component converted the battery's direct current for the house?
With DC bidirectional charging, the wallbox converts in both directions.
Why did the household need fewer rules for V2H than for V2G?
Feeding the public grid brings generator requirements, metering in both directions and market rules.
Where did the value of the evening come from?
The car stored cheaper energy and released it when the house would otherwise buy expensive energy.
- OCPP Open Charge Point Protocol: the open protocol between a charger and its operator's backend. EV charging fundamentals, stop 03 Glossary
- ISO 15118 International standard for the digital communication between car and charger, the basis of Plug & Charge. EV charging fundamentals, stop 08 Glossary
- Bidirectional charging Smart charging in which the electricity can also flow from the car's battery back to the charging point. Stop 01 Glossary
- V2H Vehicle to home: the car powers the house behind its meter through a bidirectional wallbox. Stop 02 Glossary
- V2G Vehicle to grid: the car feeds energy into the public grid, usually through an aggregator or supplier. Stop 02 Glossary
- V2L Vehicle to load: the car powers a device through a socket, without the grid. Stop 02 Glossary
- Smart charging Charging whose power is adjusted in real time, based on information received electronically, for example from the grid operator or a price signal; EU law calls it smart recharging. Stop 01 Glossary