First thing you want to consider when hiring solar technicians is expertise. Naturally, you want people who have the best know-how on the job. This not only ensures you get a lasting installation but also that you don't end up spending more than you should on unnecessary stuff.
The second factor, ironically, is cost. When it comes to installation cost, you don't want to skew too much to one side. That is, you don't want to pay too much, but also you don't want to cut costs and end up having to pay for it in the future.
Usually, experience is key when it comes to solar technicians. I found this out the hard way during my Solar Panels Kent installation. Don't hesitate to ask for referrals and check out previous reviews so that you can be at least assured of a level of base expertise.