Summary output definitions

Parameter	Units	Symbol	Formula
Reference plane of array irradiance	kWh⋅m⁻²	G_i,ref	$1000$
Front plane-of-array irradiation	kWh⋅m⁻²	H_POA,f	$\sum_{k} G_{(P O A, f, k)} τ_{k}$
Rear plane-of-array irradiation	kWh⋅m⁻²	H_POA,r	$\sum_{k} G_{(P O A, r, k)} τ_{k}$

Parameter	Units	Symbol	Formula
Energy yield	Wh	E_out	$\sum_{k} P_{(o u t, k)} τ_{k}$
Specific yield	kWh⋅kW^-1	Y_S	$\frac{E_{o u t}}{P_{0}}$
Performance ratio	-	PR	$\frac{E_{o u t} / P_{0}}{H_{P O A, f} / G_{i, ref}}$
Bifacial performance ratio	-	PR_bifi	$\frac{E_{o u t} / P_{0}}{(H_{P O A, f} + φ \cdot H_{P O A, r}) / G_{i, ref}}$
Average daily specific yield	kWh⋅kWp^-1⋅day^-1	Y_s,daily	$\frac{Y_{s}}{N_{d}} = \frac{E_{o u t}}{P_{0} N_{d}}$
Array losses (normalised)	kWh ⋅ kWp⁻¹ ⋅ day⁻¹	L_{c, norm}	$\frac{L_{c}}{N_{d}}$
Normalised balance of system loss	kWh ⋅ kWp⁻¹ ⋅ day⁻¹	L_BOS,norm	$\frac{L_{B O S}}{N_{d}}$

Parameter	Units	Symbol	Formula
DC power rating	kW	P₀	$\sum_{k} P_{(S T C, k)}$
Module bifaciality	-	φ	$\frac{P_{m a x, r e a r}}{P_{m a x, f r o n t}}$
Reference yield	kWh⋅kWp^-1	Y_r	$\frac{H_{P O A, f}}{G_{i, ref}}$
Bifacial reference yield	kWh⋅kWp^-1	Y_r,bifi	$\frac{H_{P O A, f} + φ \cdot H_{P O A, r}}{G_{i, ref}}$
Rear-side contribution to reference yield	kWh⋅kWp^-1	G_bifi	$\begin{aligned} Y_{r, b i f i} - Y_{r} \\ = \frac{φ \cdot H_{P O A, r}}{G_{i, ref}} \end{aligned}$
Array capture loss	kWh ⋅ kWp⁻¹	L_c	$Y_{r} - Y_{A}$
Balance of system loss	kWh ⋅ kW⁻¹	L_BOS	$Y_{A} - Y_{f}$

Irradiation