A crucial point: You can tell a good installation company – apart from their references – by the fact that beyond implementation and lightning protection, they also offer to take care of maintenance right from the start.
No liability, no insurance
Also, good installation companies strive to be on good terms with their suppliers. That can only be beneficial to solar customers. Very often it is impossible to get an insurance or liability for your solar or energy storage system, if it was not installed by trained and certified craftsmen. (HS)
Look at this:
Solar advice: Find out about return and recycling!
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