When to use a roof mounted combiner box?
While individual string overcurrent protection is required on any installation with more than 2 strings we can’t see the down side in installing combiner boxes with individual string overcurrent protection for every installation! Better to be safe than sorry. • When should you use QuickMount PV flashings? Let’s face it: QuickMounts are expensive. In fact, the cost of the mounts may almost double the price of an average flush mount PV array racking system, leaving both you and your customers a bit put-off. My advice is to put the decision to use (or not use) these flashings firmly on your customers’ shoulders. I would let them know the cost with, or without integrated flashings. I would also insist that if they choose to not use integrated flashings then they must sign a waiver to the fact that integrated flashings were offered to them by you, and that they (the client) chose to save money and not install them. Also, if they are not used, and leaks are discoved (within the installation
