Як правильно порахувати допустиму кількість панелей для інвертора чи MPPT-трекера - показую приклад

@bogdankushlyk The logic of calculating the number of panels allowed for an inverter. A few general rules: Do not exceed the maximum permissible currents! Isc is not written in the inverter parameters for nothing! If an array of sequentially connected panels - the voltage is added, the current remains the same. If several panels or their arrays are in parallel - the current is added, the voltage remains the same. The panel ratings on the nameplates are given at STC - standard test conditions or standard test conditions, 1000W/m2 illumination, and +25 degrees Celsius temperature on the cell. Example of calculation for a 5 kW Deye inverter and Longi 435W panels. 1. initial data Voc panel at STC (standard): 39.33V Isc panel at STC: 14.22A temp. coefficient for Voc: -0.23%/С maximum permissible for the inverter per array by Voc: 500V maximum permissible for Isc per tracker: 17A minimum possible temperature for Kiev: -26.1 degrees Celsius (data taken from here https://mao.kiev.ua/weather/belcherto...) 2. check whether Isc does not exceed the permissible value. Isc of the panel must be less than the permissible Isc of the inverter. 14.22A less than 17A 3. calculate Voc at -26 degrees. Voc * 0.0023 * 51 + Voc = 39.33 * 0.0023 * 51 + 39.33 = 43.95V 4. calculate the maximum possible number of panels per array. Voc max inv / Voc(-26) = 500 / 43.95 = 11.37 pcs. we round only down, i.e. 11 panels in a row is the maximum. Calculation example for a 20 kW Deye SM2 inverter and Risen Titan 590W panels 1. initial data Voc panel at STC (standard): 41.2V Isc panel at STC: 18.21A Temp. coefficient by Voc: -0.25%/С Permissible maximum for the inverter per array by Voc: 800V Permissible maximum by Isc per tracker/input: 54A / 27A Minimum possible temperature for Kyiv: -26.1 degrees Celsius (data taken from here https://mao.kiev.ua/weather/belcherto...) 2. check whether Isc does not exceed the permissible value. The Isc of the panel must be less than the permissible Isc of the inverter. 18.21A less than 27A 3. calculate Voc at -26 degrees. Voc * 0.0025 * 51 + Voc = 41.2 * 0.0025 * 51 + 41.2 = 46.453V 4. calculate the maximum possible number of panels per array. Voc max inv / Voc(-26) = 800 / 46.453 = 17.22 pcs. round down only, i.e. 17 panels in a row is the maximum. Become a sponsor of this channel to receive bonuses:    / @bkwindsolar