MARBERO 21W Portable Solar Panel Foldable Solar Panel Charger IP65 Waterproof Solar Panels 23% High Efficiency Fast Charger USB Ports & DC 18V Output for Camping Outdoor Travel Emergency Cloudy

You tried something like this: https://a.co/d/0fq0AwBx? By the specs of the takki, it appears to want about 19V: Adapter InputDC 19V/1.5A 18V would seem like it should be close enough (and not too high).