I am not sure to understand, are you going for a DIY job, i.e. any outdoor camera + "big enough" solar panels + "big enough" battery + some way to transmit th

I am not sure to understand, are you going for a DIY job, i.e. any outdoor camera + "big enough" solar panels + "big enough" battery + some way to transmit the data (Sim card modem/router)? Or you mean a product that is already assembled? Hikvision makes some, but surely they are not cheap, it greatly depends on your requisites, if you want something reliable I believe you need to get something "professional" not the 100-200 bucks ones you find on Amazon or similar.