I worked only a month in the industry in a company from Tarnów. I didn't like the boss who probably had some kind of stalking mania - every boy wanted to rob him or spy on him and compel the loyalist for 3 years after any training, the guy had a lot of staff rotation - I switched from PV to electrical installations which I do not regret.
Returning to the question - PV installer - work mainly in delegation, mostly physical on roofs - ground constructions are relatively rarely mounted at private investors - I installed one on Mazury, the other roofing. The installation consists of Lego blocks, only the power cable is associated with forging / drilling / digging. Bringing panels onto roofs is the most boring and persistent - you need to cool down stairs / scaffolding. I also dealt with programming inverters and updating softens - this part is the most pleasant. The rate at the former employer (2015) was from PLN 1,300 up on hand.
PS. If the employer does not provide ropes and security, then you are refused to work - you have to have equipment and full stop.