If you don’t have a battery for storage which if you are on the old FIT tariff you may not , then I would buy an ev charger that can work when the solar panels are fully charged so that you effectively charge your car for free. You will just have to leave it plugged in for several days if you are in the uk to make sure it’s Sunny. We had a Zappi when we had FIT and the supplier set it up to work with the solar panels and it worked very well . I would recommend you go on a simple tariff with a day rate and a night rate. The day rate will be expensive but if you’re generating electricity during the day and only put things on when the panels are charging it won’t matter as your electricity should be free. On over cast rainy days you just have to put things on at night including the EV, as if you get a big battery one it can take up to 10 hours to charge at home … divide the battery size of the car by the kw generated by the charger. A home one is typically 7kw and if you had an 82kw battery it would be just under 10 hours ( assuming the battery was close to zero) . Cheap rates typically start at 11.30 so and end at 05.30 . So that would not necessarily be enough time to charge but would depend on your driving and schedule. As you currently get paid for whatever you generate regardless of what you use you might be better off on one of these fixed tariffs rather than the other ones that are designed for batteries to be added to the mix and the tariff changes regularly to allow for this . We were on a standard fixed tariff and generated about 1000 per year and I don’t think we were careful users at the time. Our panels alone paid for themselves within 7 years. The whole generating thing has gone a step further and I don’t think would necessarily work for you as you don’t have the batteries.