A typical electric car carries a 60-to-80 kWh battery. The average American home, by comparison, burns through about 29 kWh of electricity a day, according to the U.S. Energy Information Administration. Run the numbers and a fully charged EV is parked in the garage with two or three days of backup sitting inside it — if there's a way to get that power back out. That little "if" is where most of the confusion starts.
Three letters that keep getting mixed up
The acronyms sound interchangeable. They aren't.
V2L (vehicle-to-load) is the simplest of the three. The car turns into a big portable battery with a socket — plug in a fridge during an outage, run a few lights, or power tools out on a job site. No special wiring at home, no utility paperwork. Many EVs already ship with it built in.
V2H (vehicle-to-home) is what people usually picture when they imagine running the house off the car. The EV feeds the home's electrical panel through a charger that moves power in both directions, covering critical circuits — or the whole house — when the grid drops. This takes more than a standard charging unit; the equipment has to invert the flow and sync safely with the panel.
V2G (vehicle-to-grid) goes a step beyond that. The car exports electricity back onto the grid, ideally when demand and prices spike in the early evening. The utility, in effect, rents your battery for a few hours. NREL has studied this approach for years as a way to absorb cheap midday solar and ease the evening crunch.
Why the hardware matters more than the car
Here's the catch most buyers miss: the car is rarely the bottleneck. The charger is.
Almost every home EV charger only pushes energy one direction — into the vehicle. Pulling power back out calls for a DC unit that can reverse the flow and clear interconnection rules before a utility allows any export. In the United States, that means meeting standards such as IEEE 1547, the benchmark for tying distributed energy sources into the grid. Gear like the Sigen EVDC handlestwo-way charging hardware at 25 kW, enough to carry a home through an outage while still leaving usable range in the car.
So the real question isn't "can my EV do this." It's "is the equipment between the car and the panel built to send power both ways."
The rooftop solar angle
This is where it gets genuinely interesting for solar owners. Tie bidirectional charging to panels and a stationary battery, and the EV stops being a standalone gadget. Daytime sun tops up the home battery; the car fills overnight gaps or exports during peak-rate windows.
An integrated approach matters here, because juggling separate inverters, batteries, and chargers gets messy fast. A unit like SigenStor folds the inverter, battery, and EV charging into one stack, while a device such as the Sigen LoadHub manages near-instant switchover when the power cuts out. For households already weighing solar battery storage, folding the car into that same system is often the part worth thinking through first.
The market is moving this direction regardless. More than 14 million electric cars were sold worldwide in 2023, according to the IEA, and BloombergNEF expects bidirectional-capable models to shift from pilot programs to mainstream over the coming decade. As that happens, the line between "car" and "home battery" gets blurry — in a useful way.
For anyone shopping panels and batteries right now, the smarter move is to treat the EV as one piece of a single energy system rather than a separate purchase made later. Sorting out the charging hardware before locking in the rest tends to save both money and regret.
