Even though I didn't exactly receive an overwhelming number of helpful responses to my plea for advice above, I went ahead and ordered a Dokio 100W portable solar panel from Amazon and it arrived this morning - this one but mine was a £70 Prime deal):
After opening the box and looking at it all, I began to realise that I had maybe made a mistake when I went to plug the long cable into the short lead coming out the panel itself (I believe they're called SAE connectors) and discovered that there was no grip at all between the two parts to the extent that once they were pushed together if you tried to move either side. the connectors immediately came apart and even I know that loose connections like that are a potential recipe for disaster. On top of that, when I kept the two halves of the connector pushed together and plugged the lead into my 50% charged Jackery Explorer 1000 V2 (with the supplied adapter), there was NO charge going into it, despite the panel being directly under the very bright mid-day sunshine. After that I did a quick check with a muti meter and found that although there seemed to be almost 19V coming out of the panel, there were no amps or watts showing so I can only conclude that I got sent a wrong un and it's going back - I would have sent it back anyway simply based upon the potentially dangerous connector. Maybe I just made a mistake in buying the cheap panel but I did do a bit of research and saw some favourable reviews.
