I don’t know about this model, but there are a few Chinese Dc to DC solar chargers that are rated and have similar features (they do not all look same so who knows), but I’d be surprised if there’s much difference. They range from 120-200 usually.
the Atem VABG008A-UFA being one. I have one of these and have tested it. It seems to work, but I haven't used it enough to put any sort of seal of approval. This is more just food for thought.