Going on a long trip and my Prius V will be parked for 2 weeks. I bought a battery pack for jump starting it, but would rather not have to jump start it if possible. I bought a cheap 5W solar panel which I'm hoping is enough to keep it topped off (but not enough to overcharge it). I don't particularly want to mount the panel on the dashboard and try to run the cable out the door, under the hood, and to the fuse box, is there any issue with connecting it directly to the battery in the trunk? Other than more of a pain to access and less sunlight from the rear window? I did also buy an obd connector which I'd prefer to use but apparently some people have had issues with the panel having non-standard polarity so don't want to rely on that.