Can I connect panels of different capacities on the same PV array?

It is not recommended to use panels of different capacities as this leads to system inefficiency (the overall power of the PV array will be limited to the panels with the less capacities).

Additionally, when panels of different voltages are connected in a string the panel with the higher voltage would act as a generator and the panel with the lower voltage would perform as a load.

Furthermore, the usage of different capacity panels invalidates the warranty for most panel brands.

Please make use of the kit builder as all designs will take this into account.

https://portal.segensolar.co.za/nav/pv/StorageSystems/SelfConsumptionKits