Would it look weird if i put a portable solar panel in front of the windshield cover to charge like a jackery during the day?

Testing over on the old CRVL forum showed about 50% of the power was blocked by the windshield. And solar panels superheat to something like ambient +50F.

If your car already has roof rack or rails I'd give serious consideration to mounting a panel up there.

I don't think it would look weird. I'm certain you'll have to come up with a way to hold up. a solar panel that will charge a Jackery will be too heavy for a windshield cover/visors to hold up.

Who cares what it looks like ?

I have my Jackery plugged into my truck and I have no problems charging all my Ryobi that charges everything USB powered at closer reach. My sleeping mats cover the Jackery at night when I prefer to charge everything so the Ryobi lights and radio make things a lot easier.

Is your car not charging your Jackery enough?

Try it with something you can return first, if you live in a hot place. I live in Florida and the 18V panel I had would cut out from the heat when I used it in the windshield. I built something to waterproof it and mount it outside, it took on water because of condensation over night, it was probably the biggest shit show of anything I've tried out since I started living in a van.

Now I charge either at work or at coffee places like Panera. Charging time is the biggest concern. In the hottest part of the year I charged two batteries roughly 2 hours a day to run two usb fans all night (I charged them at work.) Later, I realized I could cut the charge time by using higher voltage batteries. I already had Ryobi 18Vs, and a charger, I just bought an adapter* to knock it down to usb. I can charge one large battery in an hour and run one fan for like four nights straight, and that's an old battery that's got some heat damage. If you have a jackery, I believe those are 36 or 44 volt, so figure for an even faster charge time.

(*I actually don't recommend the Ryobi brand adapter because it automatically cuts out after 8 hours.)

It won’t. Keep in mind that your windshield will block some of the sunlight and power. I’ve got 40 watts in panels that I keep on my dashboard and I probably get a solid stream of 20 watts in ideal conditions. It’s plenty good to keep my battery charged though.

Looks weird and won’t work as well as if it’s outside the car. That said it’s less weird than having it on the outside of your windshield. I think it’s just gonna have to be a judgement call as to what’s right for you. Tbh on occasion I used to use a bike lock to lock my stuff to a fence in a back area that’s fairly low traffic of a local park.

Does it matter how it looks?

I kept one in the back window of my car all summer, didn't do much but charge my phone and vape. Useless in winter though.