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Optimal solar backup - Solar

1. 2 Smart Boost allowed 4 Battery priority voltage Xtender settings AL ESC SET b Press SET and search with Press SET and search with y y Basic settings 1100 Basic settings 1100 Press SET and search with A Press SET and search with 4 Smart Boost allowed Battery priority eet voltage 1297 say ie oars Press SET adjust the desired win y aO press value with and press SET The Smart Boost is Your battery voltage allowed is at the right value Page 5 7 Kariger 5 Maximum current of AC source Input limit Xtender settings Press SET and search with Basic settings 1100 Press SET and search with Maximum current of AC source Input limit 1107 Press SET adjust the desired value i with and press SET Your input current is adjusted i The current value Aac must be set according to the size of the circuit breaker or the grid capacity Page 6 7 Nsrever Notes Worldwide sales and service Switzerland Studer Innotec SA Rue des Casernes 57 1950 SION Switzerland Tel 027 205 60 80 Fax 027 205 60 88 Email info studer innotec com Web http www studer innotec com Limitation of responsibility The use of STUDER INNOTEC SA devices is the responsibility of the customer in all cases STUDER INNOTEC SA
2. In such a system there is the choice between storing or not the renewables in excess If renewable energy is stored energy in the battery ies will therefore be cycled implying a decrease of the battery ies lifetime If renewable energy is not stored it will be lost but the energy in the battery ies will be stable implying an extension of the battery ies lifetime The question is whether to store the excess renewable energy not Where the price of battery ies storage is cheaper than the cost of grid generator energy itis advisable to store the renewables in excess Otherwise if grid generator energy is cheap it is advisable not to store the renewables in excess If the renewable energy production in excess is not buffered Figure 5 the battery ies priority voltage should be set for example to 0 5Vdc below the floating voltage of the solar wind regulator Power No storage of excess renewable energy the energy is lost J SN Grid energy S Renewables directly used Z A Renewables lost Figure 5 Load profile without renewable energy buffered Another case concerns the situation where there is no excess renewable energy Figure 6 Power cw i Load profile i SA Grid energy S Renewables directly used Figure 6 Load profile without excess of renewables Page 3 7 Time Time The battery ies priority voltage should also be set to 0 5Vdc below the floating voltage of t
3. reserves the right to make any modifications to the product without prior notification Page 7 7 herten
4. Leres Optimal solar backup General description This application note describes how in a backup system to use renewable energy even when the system is connected to a grid and the grid feeding is not possible Features amp advantages Ideal for backup system with renewables where there is no feed in tariff or where grid feeding is not possible Use all of the renewable energy available Direct use of renewable energy without cycling energy in the battery ies to avoid their premature aging Application Schematic Grid or Generator Solar regulator A WIND regulator A e A g Renewables Application Note Minimal configuration e Range of inverters o All Xtender Series e Xtender o Software vers 1 3 28 and higher e RCCO02 03 o Software vers 1 3 32 and higher o RCC User level EXPERT Xtender series Battery ies Figure 1 Backup system using renewable energy without grid feeding Page 1 7 Consumers re ar gt o Gl VS DALONNI YJANLS OL Z L A Z00 NV Detailed description Operation description In a backup system the power to the end consumer is taken from the input grid generator or in a blackout situation from the DC side battery ies renewables Generally in the case where grid feeding is not possible the renewable energy is lost when the system is powered from input This application note shows the possibility to use the renewable energ
5. he solar wind regulator to keep it loaded to a maximum Operating example For example if battery ies are higher than the priority voltage and if a solar panel is connected to the battery ies at the DC side its regulator MPPT or other provides solar power to the DC bus At the same time the Xtender will take away the solar power to maintain the DC Bus at the priority voltage This represents a direct use of the solar power in the final user load without cycling energy in the battery ies If battery ies are lower than the priority voltage solar power is used to recharge the battery ies Charging from the grid is now allowed because the objective is to keep the battery ies charged for backup time generator is off blackout no more sun For proper functioning of the system the voltage target of the solar wind regulator should therefore be above the battery ies priority voltage Solar priority function s algorithm The solar priority function s algorithm maintains the battery ies at a proper level for long lifetime and always keeps a reserve of energy for backup The input limit is reduced linearly over a working range as shown in the graphic below Input current A Battery priority Max source AC risl 1107 Battery volcage Ydd Interval dc XT HAYS 12 0 25 XT HAWS 24 05 XT HAUS 43 10 e Power of Inverter charger Figure 4 Graph of Solar priority function Curren
6. t taken on the AC source depending on the battery ies Kariger Parameters Four parameters allow controlling the energy management with different sources 1 Battery ies priority as energy source 1296 2 Smart Boost allowed 1126 3 Battery ies priority voltage 1297 4 Maximum current of AC source Input limit 1107 Associated application notes ANOO1 AC source assistance Smart Boost function More information about the Smart Boost is available on the ANOO1 AC source assistance Smart Boost function The voltage values for the battery ies priority voltage 1297 are available at the next page item Battery ies priority voltage More information about the source max AC current and the battery ies priority voltage are available at the next page Page 4 7 herten RCC 02 03 programming guide 1 User level to EXPERT 3 Battery priority as energy aan source E Press SET and search with Press SET and search with User level 5012 y Press SET and insert the code SYSTEM 1101 e Press SET and search with Press SET Battery priority as energy source 1296 Your level is EXPERT Press SET selection Yes with and press SET Your battery ies are i The code is available in the user manual RCC 02 03 the priority energy source
7. wable energy in excess can be stored When there is higher production of renewables than power consumed it is possible to store this production in the battery ies s buffer zone for later use see figure 4 Power Compensation of gnd energy by renewable energy stored in the buffer Load profile kK S M Renewables directly used Renewables buffered and used later Figure 4 Load profile with renewable energy buffered An example to determine the value of the battery ies priority voltage considering a battery ies of 24Vdc Full battery ies 25 5Vdc empty battery ies 24Vdc and a backup zone of 80 of the total capacity of the battery ies Full battery ies Fullpat 25 5Vdc Empty battery ies Emptypa 24 0Vdc Battery ies priority voltage is Emptypat 80 Fullbat Empty pat 24 0 8 25 5 24 25 2Vdc Note that even with the battery priority voltage the battery charging proceeds normally and accepts the absorption and equalization phases Thus it is possible to program absorption and equalization phases to reduce the problem of Stratification of the acid and the water decrease in the batteries But to avoid cycling the batteries too often it is necessary to adjust the parameter 1297 Battery priority voltage to a value higher than the parameter 1143 Battery voltage level 1 to start a new cycle Kariger Saving the renewable energy or the battery ies life
8. y of the system even when the system is connected to a grid This operation requires an inverter charger from Xtender series with two special functions e The Smart Boost function which adds power to the AC source according to the input limit current e The solar priority function which adjusts the instantaneous power consumed from the source according to the battery ies voltage The operation of the solar priority function is done with an automatic modification of the input limit current The input limit current is decreased from the initial value given by the user if there is enough energy available at the DC side The lower the input current the more the load is provided with DC power by the Smart Boost function In this way the power from the DC side is integrated in the system and the input consumption is limited Input current decreased oe Generator or Grid Figure 2 Smart Boost function Battery priority voltage description and dimensioning The point where the input limit starts to decrease is the priority voltage of the battery ies parameter 1297 SSS SSS SSS SSS Buffer for renewable Battery poses s priority voltages 1297 Energy for backup DO Figure 3 Battery priority voltage Page 2 7 This parameter sets two zones in a battery ies ooz e A zone below this point which ensure an energy reserve for a blackout situation e A zone above this point where the rene

Optimal solar backup - Solar

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