In reply to Derry:
The usual answer is Anker. I have an Anker powerpoint solar lite currently selling on Amazon at £39.99. which I think is their lightest model at 340g. I used this successfully in the Pyrenees, but I have replaced it with a cheepo eBay thing from China which cost £10 and weighs 87g (a bit fragile but seems to work OK)
If you or anyone else wants the Anker model I will sell for £25 inc postage and packing.