If you'd like to know more about renewables for your camper van, were a UK based company and can supply everything you need such as solar panels, charge controllers, inverters, batteries we also can help with installation if needed
We have just written a case study on one van we installed a PV system on for full time Van- lifers Sophie Mckeand and Andy Garside
https://www.remotepoweruk.com/case-studies/camper-van-off-grid-installation/