EF ECOFLOW TRAIL 300 DC Solar Panel with 60W Solar Generator, 288Wh LiFePO4 Power Bank, Power Station, for Camping, Travel, and Emergency Power

Something like this is enough to keep a phone or two charged and run a couple of LED light bulbs for several days assuming that you're running your lights for only 4-6 hours per day. And the solar panels will fully charge the battery on a sunny day or likely charge up a days usage on a typical overcast day (and you won't get much charge if the day is so overcast that it's dark out). This is admittedly very limited but it does quite a bit better than nothing. But as you add money you can go up from there.