Temperature increase in BICPV systems causes loss in electrical efficiency.
Utilising PCM passively cools these systems and store thermal energy.
A low-concentrator based BICPV system linked to a designed wax-based PCM system.
PCM use increases the electrical efficiency of the system by 7.7% at 1000 W m−2.
A novel optimised mathematical model for a BICPV–PCM system is proposed.