NABCEP PVIS case studies
NABCEP PVIS · Put your knowledge to work in context.
The NABCEP PV Installation Professional (PVIP) Board Certification is a professional credential offered by the North American Board of Certified Energy Practitioners (NABCEP) for individuals working in the solar photovoltaic (PV) industry. It is designed for experienced PV installers, designers, and technical professionals who seek to demonstrate their knowledge and competence in the field. The NABCEP PVIS case studies are 5 cases and about 3,334 words.
1Cold-Weather String Sizing on a Mixed-Orientation Roof
A homeowner has 16 identical 410 W modules: 10 on a south roof plane and 6 on a west plane. The proposed 5.0 kW inverter has two MPPTs, a 600 V maximum DC input, a 90–550 V MPPT window, and a 15 A maximum input current per MPPT.
678 words, about 3 min2120% Busbar Rule and an 8 kW Backfeed
A 200 A residential service panel has a 200 A main breaker and a 200 A busbar. The calculated load is 145 A.
721 words, about 4 min3Rooftop Conduit Ampacity with Six Current-Carrying Conductors
Three strings of 10 AWG PV wire leave a roof-mounted array in a single 1-inch EMT conduit. The conduit is supported 6 in above the roof and contains three positive and three negative conductors, all current-carrying.
575 words, about 3 min4Inverter Replacement Triggers Rapid Shutdown Upgrade
An existing 2016 6.0 kW PV system has 24 × 250 W modules, two strings of 12, a string inverter mounted in the garage, and a 40 ft DC home run in conduit from the roof to the garage. The inverter fails and is replaced with a new string inverter of the same architecture.
722 words, about 4 min5Battery Backup Neutral-Ground Bonding with a Solid-Neutral Transfer Switch
A 7.6 kW PV system is paired with a 10 kWh battery inverter and a 200 A backup loads panel. The automatic transfer switch opens both ungrounded service conductors but has a solid neutral.
638 words, about 3 min