The short answer
V2H means using a vehicle’s energy in the home; V2G includes exporting to the electricity grid. Power-cut backup is an additional system capability that must be explicitly confirmed.
Start with the use case
For daily V2H, the question is whether energy from the car can replace household imports while retaining the driving reserve. For V2G, the question also includes the export service and its operating terms.
For backup, the system must be designed to supply the agreed loads when the grid is unavailable. Do not assume that normal grid-connected bidirectional operation proves this capability.
Verify the complete combination
Ask for evidence covering the exact vehicle model, model year, software, charging hardware and control service. A compatible-looking plug is not enough.
Confirm which functions are available in the intended market and who supports the system when a vehicle or charger software update occurs. These checks should precede a purchase decision.
Protect the driving requirement
Consider an illustrative 60 kWh usable vehicle battery at 70% charge with a 40% minimum driving reserve. The nominal difference is 18 kWh before discharge losses and other restrictions.
That arithmetic does not establish that 18 kWh is available to a house: the vehicle must be connected, the system compatible and the operating limits satisfied. A planned journey may require a larger reserve.
What SolarIQ does today
The public calculator models EV charging demand. It does not control vehicles or forecast V2H/V2G income.
For a proposed project, prepare a vehicle-and-equipment compatibility assessment and a separate backup specification where needed.
Before your assessment
Bring these questions with you.
- Exact vehicle and charger compatibility.
- Explicit confirmation of power-cut operation.
- Driving reserve and departure requirement.
- Support, updates and service terms.