I have a heat pump and an ev. Last month, I was only in town about 11 days, so I had my heat turned way down and didn't charge my car very much - in fact, I drove my gas car mostly those days since gasoline is cheaper than electric right now, and there was some time I used my oil boilers just to keep the pipes from freezing.

I used 1594 kWh and generated 520kWh from my solar, which annually produces 80% of my needs. If I were home and had the heat higher, and charged my car a little more I would have used nearly 2000kWh, producing only 25% of what I used in December. By the way, before my heat pump and EV, my home used an average of 354kWh in December, so my solar panels would have covered my use, and still had some left over for my EV.

In July, I on average would use 1192 kWh, and produce 1825kWh.

Having an EV doesn't "balance" the year, it actually makes winter electricity more expensive, when they need fossil fuels to generate the electricity that my solar panels aren't making in the winter, but my heat pump needs. More expensive winter electricity means less people getting heat pumps and EVs.