Solar home battery systems are becoming popular to final consumers driven by substantial price reduction. The use of batteries couples solar energy generation and demand patterns increasing the use of the installation and the self-consumption rates. However, the feasibility of batteries is still under discussion especially when referring to reliability along its lifetime. In this sense and to guarantee positive revenues to end-users, long-term battery models should be investigated. To this end, this study presents a simplified battery ageing model to assess the impact of battery degradation in a comprehensive solar home battery system. This work demonstrates that, if battery ageing mechanisms are considered, revenues derived from the installation decrease by half. In addition, feasible unitary battery price cost is limited up to 400 EUR/kWh.