Installations Guide: Fronius GEN24 Plus - Solar Energy - Fronius International
Instructions for Fronius models including: GEN24, GEN24 Plus, GEN24 Versatile Hybrid Inverter, GEN24, Versatile Hybrid Inverter, Hybrid Inverter, Inverter
10 apr 2025 — Fronius reserves all rights, in particular the right of reproduction, distribution and translation. No part of this work.
10 апр. 2025 г. — The Circuit Diagram shows a typical wiring variant with external relay and manual switchover, e.g. to manually switch on a pool pump for backwashing. Also ...
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DocumentDocumentEnergy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus Whitepaper Information Class: Public, Fronius International, 01/25, 10.04.2025 Fronius International GmbH © Fronius International GmbH Version 01/25 Solar Energy Fronius reserves all rights, in particular the right of reproduction, distribution and translation. No part of this work may be reproduced in any form or stored, processed, copied or distributed using electronic systems without the written permission of Fronius. It should be noted that, despite careful editing, all information in this document is provided without guarantee and liability on the part of the author or Fronius is excluded. Gender-specific formulations refer equally to the female and male form. Table of contents Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 1 Introduction .................................................................................................................................. 4 2 Cabling ........................................................................................................................................... 4 2.1 Circuit Diagram........................................................................................................................................... 4 2.2 Examples of relay types ............................................................................................................................ 5 2.3 Circuit Diagram........................................................................................................................................... 6 3 Connection with the web interface ............................................................................................ 7 4 Activate Digital outputs............................................................................................................... 7 5 Configuring Digital outputs ........................................................................................................ 8 5.1 Control system............................................................................................................................................ 8 5.2 Thresholds................................................................................................................................................... 8 5.3 Running times ............................................................................................................................................ 9 5.4 Prioritization ............................................................................................................................................... 9 5.5 Prioritization ............................................................................................................................................... 9 6 Application examples ..................................................................................................................11 6.1 Battery, Fronius Ohmpilot and pool pump .......................................................................................... 11 6.2 Load management & e-car ..................................................................................................................... 11 7 Further information ....................................................................................................................12 Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 1 Introduction The main reason why photovoltaic systems are equipped with controllable loads is to increase selfconsumption and self-sufficiency. High self-consumption means using as much of the energy produced as possible yourself. Self-sufficiency means drawing as little energy as possible from the grid, i.e. being as independent as possible. To achieve these goals, a Fronius Smart Meter is installed at the house connection. This measures how much power is fed into the grid and how much is drawn from the grid. If more power is generated by the PV system than is consumed in the house, this is referred to as PV surplus. If more power is required than the PV system generates, this is referred to as grid consumption. For better self-consumption and greater self-sufficiency, Fronius offers the Fronius Ohmpilot and Fronius storage solutions that are optimally tailored to the system to generate heat from the excess energy, e.g. for hot water, and to transfer the excess energy from day to night. The GEN24 [Plus] inverters also offer the option of using four digital outputs to control loads in such a way that they are preferably operated with PV power. 2 Cabling 2.1 Circuit Diagram The Circuit Diagram shows a typical wiring variant with external relay and manual switchover, e.g. to manually switch on a pool pump for backwashing. Also practical are relays with integrated auto on-off Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 switching. Figure 1 - Circuit Diagram Example 2.2 Examples of relay types When selecting the relay, the technical specifications must be observed (coil power max. 3.2 W, coil voltage, switching voltage and switching current). The following types are suitable, for example: Figure 2 - FINDER relay 48.31.7.012.0050 4C series - 10A, 12VDC + DIN rail mounting Series 48 Figure 3 - Weidmüller relay 6A -MRS 12 VDC 1CO 1 changeover contact Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 Figure 4 - FINDER 12 V DC relay 19.91.9.012. 4000 2.3 Circuit Diagram The Fronius GEN24 [Plus] offers some additional functions such as two Modbus RTU (RS 485) connections to the Fronius Smart Meter (M-, M+, Gnd) or the battery (10-pin orange plug). The 16-pin plug next to it contains the Digital On outputs. (For pin assignment, see Figure 5 below). You can find more detailed information on installing and commissioning the Smart Meter at the following link. V+ M0+ SHIELD M1+ V+ GND M0- SHIELD M1- GND V+ V+ IO0 IO2 IO4/RG0 IN6/1/5 IN8/3/7 IN10 GND GND IO1 IO3 IO5/CL0 IN7/2/6 IN9/4/8 IN11 Figure 5: 10-pin plug - 2 x Modbus RTU, 16-pin plug digital inputs/outputs (IO 0-IO 3) Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 3 Connection with the web interface Figure 6 - Activating the access point on the inverter Connect end device to WiFi access point a. Search for the grid with the name "FRONIUS_xxx.xxxxx" on the end device b. Connect to this grid c. Enter the password located on the nameplate on the side of the inverter: 12345678 d. Enter http://192.168.250.181 (IP address of the WLAN connection) in the browser of the end device. For a LAN connection, enter 169.254.0.180. Further information on establishing a connection can be found in the Operating Instructions of the Fronius inverters. 4 Activate Digital outputs It is possible to control loads depending on the PV surplus or PV production. Four digital outputs on the inverter can be activated for this purpose. A downstream relay can be used to actively control loads such as pool pumps, fountains, electric car charging stations, air conditioning, etc. The first step is to activate the desired Digital outputs with which loads are to be controlled. The settings for this are enabled on the web interface. Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 Figure 7 - Activate load management outputs under Functions and pins. 5 Configuring Digital outputs 5.1 Control system The output can be controlled on the basis of the surplus power at the feed-in point or the PV power produced. The former can only be selected if a Fronius Smart Meter has been connected and activated. 5.2 Thresholds Thresholds must be defined so that the inverter knows at what power the output is switched on or off. It should be noted that the power of the connected load is taken into account for the switch-off threshold if 'per excess power' has been selected for control. In addition, a hysteresis should be applied so that the load is not switched too often in the event of small changes at the feed-in point. A pool pump with an output of 1000 watts could be operated with a switch-on threshold of 1200 watts and a switch-off threshold of 0 watts. This results in a hysteresis of 200 watts. Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 5.3 Running times The minimum runtime protects against switching too often in the event of constantly changing solar radiation or excess power, thus shortening the service life of the load. Once the load is switched on, it remains switched on for the defined duration, even if it falls below the switch-off threshold. The maximum runtime limits the time during which the load is switched on per day. For example, it makes no sense to operate a pool pump for more than eight hours a day, even if there is still excess power available at the end of the day. The individual running times of the load are added up over the course of the day. The set runtime guarantees that the load is operated for at least the set time up to the defined time. Using a pool pump as an example, the pump should be operated for at least four hours a day to maintain the water quality. It is recommended that the time until the set runtime is reached is set before sunset in order to use at least some of the excess power for the pool pump if necessary. 5.4 Prioritization It is necessary to prioritize between the battery, Fronius Ohmpilot and load management IO. It is important to ensure that the load management IOs are prioritized according to their switch-on threshold. This means that the load management IO with the lowest power is switched first. If the same switchon threshold is defined for two load management IOs, the one higher up in the list switches first. 5.5 Prioritization Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 6 Application examples 6.1 Battery, Fronius Ohmpilot and pool pump Before energy is stored in the battery, the pool pump connected to load management IO1 via a contactor should be activated. The battery is preferably intended for night-time consumption. The heating element is controlled continuously using Fronius Ohmpilot with the lowest priority, as a minimum hot water temperature is provided via the central heating system. Prioritization: 1 ... Load management IO1 with 1000W pool pump, maximum running time per day = 4 hours 2 ... Battery 3 ... Fronius Ohmpilot with 9 kW heating rod Figure 9 - Power distribution 6.2 Load management & e-car Fronius does not recommend operating the digital I/Os in parallel with the Fronius Wattpilot. As soon as there is a surplus of more than 1.38 kW, it switches on and taps all the surplus. In addition to the Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7 particularly energy-hungry electric car, other connected loads that are switched via load management would never switch on. When using the Fronius Wattpilot, the digital I/Os can at best be used for very small loads (e.g. pump with 500 W) where the switch-on threshold is below that of the Wattpilot. However, load management for such small loads will only lead to very small, barely noticeable savings in terms of overall consumption. If the customer wants their heat pump to be switched on and off depending on the surplus, there is another way to do this. It is possible to coordinate Wattpilot with Ohmpilot and the battery, as opposed to operating them together with load management. The Wattpilot, Ohmpilot and battery can be prioritized in the Wattpilot app (Solar.wattpilot). A heat pump can thus be connected to the Ohmpilot and integrated into the PV system 7 Further information You can find further documents at www.fronius.com/de/solarenergie/infocenter/support-fuerinstallateure For the visualization of the individual loads in Fronius Solar.web, see "Fronius Energy Profiling". For hot water generation or to generate any heat from your own electricity, the Fronius Ohmpilot is the optimal solution, as this PV surplus can be consumed continuously up to 9 kW. The Fronius storage solution offers an optimal solution for supplying power - especially to loads at night. Excess energy is temporarily stored in a battery. Further white papers: "E-mobility solutions - intelligent charging of electric cars with photovoltaics in the Home" "Connecting a heat pump to the Fronius energy management system" Energy flow management with the 4 digital outputs on the Fronius GEN24 & GEN24 Plus 2/7