For solar charging, I used a 120W Bluetti panel (also currently 33% off), which delivered exceptional performance even in the weak spring UK sun, feeling the power station close to the maximum rated ...

The bottom line is that this 20,000mAh power bank is a good one, built to a decent spec. The 20,000mAh capacity is actually 20,000mAh, which is reassuring given how many budget power banks I test that ...