Table 4 Performance indicators
Indicator | Description | Formula |
|---|---|---|
PV hosted capacity | Ratio between the installed PV capacity and the potential PV capacity of the roof | \(PV_{\text {host}} = \frac {\sum _{i=1}^{N} n^{\textsc {mod}}_{i} \cdot P^{\textsc {mod}}_{\text {nom},i}}{PV_{\text {potential}}}\) |
energy curtailed ratio | Fraction of the total PV production curtailed | \(PV_{\text {curt}} = \frac {\sum _{t} P^{\textsc {cur}}_{t}}{\sum _{t} PV_{t}}\) |
battery autonomy ratio | Ratio between the installed battery capacity and the mean daily energy consumption | \(\textsc {bat}_{\text {aut}} = \frac {\sum _{b=1}^{B} E^{\textsc {bat}}_{\textsc {cap},b}}{\text {mean daily energy}}\) |
net present value | The total net present value of the system (including battery replacement) | \(\textsc {npv}=\frac {\sum _{t=1}^{L} \textsc {cf}_{t}}{\left (1+r\right)^{t}}\) |
levelized cost of energy | The NPV divided by the total consumed energy | \(\textsc {lcoe} = \frac {\textsc {npv}}{L \cdot \sum _{t} P^{\textsc {load}}_{t}\cdot TS_{t}}\) |
self-consumption | Share of the PV production directly consumed by the system | \(\textsc {sc} = \frac {\sum _{t\in T} \min (P_{t}^{\textsc {load}}+P_{t}^{\textsc {cha}},P_{t}^{\textsc {pv}})}{\sum _{t\in T} P_{t}^{\textsc {pv}}}\) |
grid usage ratio | Ratio between the maximum import, export power, and the maximum load power | \(GU_{\textsc {imp,exp}} = \frac {\max P^{\textsc {imp,exp}}_{t}}{\max P^{\textsc {load}}_{t}}\) |