Off-grid solar photovoltaic systems in Malawi are deployed increasingly as the primary option for rural public infrastructures such as primary schools and health centres. Overall, grid-connected electricity access has remained stagnant at around 9% with only 1% of the rural population connected. To improve the technical sustainability of such systems, a novel remote monitoring technology utilising wireless Sensor Networks was installed and the systems were monitored over roughly one year. This paper has described the technical design, performance, and benefits received from the employment of the technology. Furthermore, it has evaluated the cost implications for a larger scale rollout and potential benefits.