As already mentioned by Tel, looking at that standard of workmanship I'd be checking the entire installation and preparing a full snag list.
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Discuss How worried should I be? in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net
For 6.5K I would be expecting gold tails never mind that crap!
I thought that price of ÂŁ6500 for a 4KW system was on the low side!! Maybe have been sold as 4KW but not what was installed?? I may be wrong mind... lol!!
Reply to How worried should I be? in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net