A study has been conducted to evaluate the internal PV resistivity value of the PV module causing the decrease of analytical output power using the Lambert-W function. The PV modules used are Solarland SLP-12 monocrystal type and Silicon Hooray MCP-2 polycrystalline type which is one of the modules sold in the market with the same output power capacity of 100 Wp. Based on curve model I(V) model…