  In this viewpoint contribution, we argue that the emerging landscape of
indoor photovoltaics poses unique challenges that transcend the capabilities of
a singular standard, unlike what the community has become accustomed with the
success of the AM1.x standard for outdoor application. We aim at illustrating
the pitfalls associated with a one-size-fits-all approach to standardisation,
emphasising the necessity for a concerted and nuanced methodology tailored to
the complexities of indoor energy utilisation, and particularly in the context
of the various needs of the Internet of Things. Acknowledging the inherent
variability in indoor illumination conditions, and using simple numerical
modelling and real-life examples to illustrate how it influences the output of
indoor cells, we advocate for a shift from conventional standards to
comprehensive guidelines that will better accommodate and evaluate the diverse
interplays between photovoltaic device, internet of things sensors, and
illumination sources. Our proposed methodology is not merely a set of rules but
a strategic framework for the community to build upon, inviting researchers and
industry stakeholders to collaborate and establish a unified foundation for
assessing the performance of photovoltaic devices indoors. By fostering a
collective approach and steering clear of rigid standards, this viewpoint lays
the groundwork for future studies to better assess the performance and
usability of indoor photovoltaics, thus ensuring innovation, adaptability, and
reliable analyses in this very fast evolving and increasingly relevant field.
