Solar Panel Temperature Coefficient & Thermal Loss Calculator

Determine actual operating cell temperature ($T_{cell}$) from NOCT/NMOT, output power thermal derating, and summer voltage drop.

STC Rated Power P_stc (W): Nameplate rating at 25°C

STC Open-Circuit V_oc (V):

Temp Coeff of Power γ (%/°C): HJT: -0.26, TOPCon: -0.30, PERC: -0.35

Temp Coeff of V_oc β (%/°C):

Ambient Temperature T_amb (°C): Midday ambient air temp

Solar Irradiance G (W/m²):

Module NOCT / NMOT (°C): Nominal Operating Cell Temp (typically 42°C – 48°C)

Operating Cell Temp (T_cell)

Actual Derated Power

Thermal Power Loss

Actual V_oc

Voltage Drop

Thermal Performance Assessment

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