## 4 Results and Discussion
### Costs of Grid-Connected Photovoltaic Systems (On Grid-PV)  
The installation cost of the power generation system is shown in Table 8, considering the prices of panels, inverters and support structures. The corresponding quotation is requested from three equipment companies for photovoltaic installations, located in Veracruz, Mexico. With this budget, MXN 660,379 (USD 30,062.61) is required for the production of 22 kWp of photovoltaic energy. Thus, the construction cost per kilowatt installed yields a total of MXN 30.01 per watt (USD 1.36), i.e., MXN 30,017.24 (USD 1620.93) per kilowatt. In this sense it is considered a price consistent with the market. [PERSON] [40] states that the cost per watt has dropped to USD 1 USD/Watt; in the case of this study, the result at the exchange rate MXN 21.96 per USD 1 was 1.36 USD/Watt, and this estimate indicates that it is possible to estimate the costs of Photovoltaic Aquaculture Systems (PV-AQS) with this reference.  
\begin{table}
\begin{tabular}{l c c c c} \hline \hline
**Photovoltaic Generator: 56 Panels \(\times\) Shanghai JA Solar Technology Co. Ltd. JAM72S03-390/PR (09/2018), Azimuth: 180\({}^{\circ}\), Inclination: 17\({}^{\circ}\),** & \\ \hline
**System Size** & **Photovoltaic System Efficiency: 78\%** & \multicolumn{2}{c}{**PV Inverter**} \\
**Generation: 22 kWp** & & & **Solis-3P12K-4G, 3-phase 220-380 Volts** \\ \hline
**Average Consumption: 3275 kWh** & **Generation Average: 2429 kWh** & \multicolumn{2}{c}{**Module power: 390 W**} \\ \hline
**Period** & **Year** & **Generation** & **kW/h base with On** & **Power Factor (\%)** & **Payment with On Grid PV** \\ \hline July & 2021 & 2761 & 439 & 28.09 & 241.75 \\ June & 2021 & 2590 & 610 & 37.67 & 211.21 \\ May & 2021 & 2713 & 487 & 30.88 & 230.36 \\ April & 2021 & 2657 & 543 & 34.04 & 220.19 \\ March & 2021 & 2655 & 545 & 34.15 & 219.88 \\ February & 2021 & 2088 & 1112 & 59.55 & 225.48 \\ January & 2021 & 2240 & 960 & 53.91 & 228.04 \\ December & 2020 & 2065 & 1135 & 60.34 & 225.38 \\ November & 2020 & 2400 & 800 & 47.06 & 235.67 \\ October & 2020 & 2343 & 857 & 49.61 & 232.20 \\ September & 2020 & 2378 & 822 & 48.06 & 234.21 \\ August & 2020 & 2258 & 942 & 53.18 & 228.60 \\ \hline \hline \end{tabular}
\end{table}
Table 6: Estimated generation of the On Grid-PV system.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Period** & **Years** & \multicolumn{2}{c}{**Without On**} & **Payment with On** & **Savings with On** \\  & **Grid-PV** & **Grid PV** & **Grid PV** \\ \hline Totals & 1 & 5471.82 & 2733.03 & 2738.79 \\ \hline \hline \end{tabular}
\end{table}
Table 7: Comparison of actual consumption and the photovoltaic system in USD.  
\begin{table}
\begin{tabular}{l c c c c} \hline \hline
**Team Description** & **Amount** & **Cost** & **USD** \\ \hline Photovoltaic Module JA Solar 390 W, 10-year direct product warrant & 56 & 232.24 & 13,005.44 \\ Solis-3P12K-4G 3 phase Inverter, Standard 5-Year Warranty with WiFi Monitoring. & 2 & 2503.27 & 5006.54 \\ Mounting system: anodized aluminum structure, stainless steel hardware with expanding anchor. & Batch & 1912.56 & 1912.56 \\ Mounting service: technical support, cable installation for AC and DC piping, photovoltaic modules, inverters and grounding & Batch & 3739.17 & 3739.17 \\ CCF contracts (interconnection contract), delivery and start-up the system, inspection of the installation by SENER and closing folder. & 1 & 3187.61 & 3187.61 \\ Load center and electrical installation in distribution panel. & 1 & 865.20 & 865.20 \\ Three-phase bi-directional meter at 220 Volts. & 1 & 1421.31 & 1421.31 \\ Indirect field costs. & Batch & 924.78 & 924.78 \\  & & & Total & 830,062.61 \\ \hline \hline \end{tabular}
\end{table}
Table 8: Construction costs of the Grid-Connected Photovoltaic Systems (On Grid-PV) in USD.