Customer

MCS Contractor

Intermediate

Full
Visual check of modules from ground level

(Check for slipped modules, damage, soiling etc)

 √ √ √
Visual check of inverter where safe access

(Check for indication of fault or damage)

 √ √ √
Recorded generation is increasing √ √ √
Visual check for signs of structural distress

(Particularly after heavy winter snow)

 √ √ √
Reduce shading from vegetation growth where possible √ √ √
AC & DC isolators

(Functional check, damage and ingress)

 √ √
DC junction boxes where present

(Damage and ingress)

 √ √
Integrity off uses and surge protectors where present √ √
Generation in line with prediction √ √
Inverter(s) mounted securely √ √
Inverter(s) ventilated

(Unobstructed airflow, fans operating etc)

 √ √
Externally mounted inverters free of signs of water ingress √ √
Inverter fault log(s) √ √
AC voltage at inverter(s) and assess risk of overvoltage √ √
DC connectors

(Secure, free of damage, supported away from pooling water)

 √ √
Clean modules

(Particularly where shallow pitch and dusty environment)

 √ √
Test UL circuits

(Vsc, lsc, Earth leakage)

 √ √
Cables adequately supported and free of damage √ √
All labelling &signage present and correct

(Including system schematic)

 √ √
Emergency shutdown procedure visible √ √
Module clamps secure

(Check torque of random sample)

 √
Mounting rails secure and free of distortion

(Including fixing brackets)

 √
String series resistance test √
String insulation resistance test (Riso) √
Potential Induced Degradation test √
Thermographic survey for faulty components and module cells √
Frequency:

Domestic Privately Owned                                                                              1yr                           10yr                15yr

Domestic Rented (Private or Social landlord)                                                 –                             5yr                   10yr

Public Building (e.g. school, hospital)                                                       6-monthly                    1yr                    5yr

Commercial and Industrial                                                                           Monthly                     1yr                    2yr

Cost (When on pay as you go)                                                                           –                      £700+vat       £1,400+vat