Clever Use of Self-Generated Electricity

Solar-Log™ Smart Energy

Feed-in tariffs are falling, tax breaks and subsidies are disappearing, and energy costs are rising. Consequently, the constantly increasing demand for energy means that the optimized use of self-generated electricity and the storage of energy are becoming essential. Solutions are offered, for example by intelligent heating with PV electricity. Solar-Log™ controls and supplies the heat pump, the heating element, or your charging station with surplus energy from your photovoltaic system. Thanks to the Solar-Log™ Smart Energy logic in conjunction with a variety of compatible devices, you can implement a wide range of applications. The basis here is the networking of the photovoltaic system with flexible consumers in order to locally optimize self-consumption. In addition, you can keep an eye on the status of the plant via the monitoring platform, which can also be done on the go with our Enerest™ ToGo app.

Added Values

  • Increase in self-consumption.
  • Reduction of grid consumption and grid usage fees.
  • Intelligent networking of photovoltaic systems with heat generators, e-charging stations, and others.
  • Reduction of the CO2 footprint.
  • Energy optimization of production processes.

The Intelligent Energy Management System

The menu structure of the Solar-Log™ enables intuitive operation. Thus, intelligent consumers, such as the AC ELWA 2, can be controlled and prioritized in combination with Smart Plugs and taking the surplus into account. Different energy profiles and components can be linked and checked based on the simulation.

Battery Storage Monitoring

Visualization Battery Performance Charging and Discharging

Battery storage systems are the ideal solution for storing the electricity generated by a PV system and making it available for self-consumption. These systems thus make a significant contribution to optimizing self-consumption of electricity. In the balance view, the battery storage system functions either as a generator or as a consumer and is displayed accordingly. The Solar-Log™ is compatible with various battery storage systems.

Forecast-Based Charging Time Shift

Exclusively for the Varta battery, we support forecast-based charging time shifting to effectively utilize the power curve of the PV system. This function is especially important with regard to subsidized systems. In order to receive a subsidy in Germany, only a certain percentage of the generated energy can be fed into the public power grid. With the forecast-based charging time shift, the Solar-Log™ determines the optimal time corridor for the charging process every morning, taking into account the weather data, size of the PV plant, and the capacity of the battery system.

Intelligent Heating with PV Electricity

Heating Rods and Solar-Log™

PV energy can be used in a variety of ways, including to generate hot water in conjunction with the Solar-Log™ and a heating rod. This allows you to use your PV energy optimally and efficiently yourself instead of feeding it into the public grid.

Here too, the Solar-Log™ offers various compatibility options with manufacturers. For example, by combining the Solar-Log™ and the AC ELWA 2 from my-PV, surplus PV power can be used to heat drinking water or combination storage tanks.

The power is regulated continuously from 0 to 3,500 W depending on surplus by the Solar-Log Base. Particularly in summer and in the transitional period, the combination increases the degree of self-sufficiency. During this time, it is often possible to completely dispense with fossil fuels for conventional water heating. The minimum temperature of the hot water tank can be defined via the device configuration. Thus, hot water can always be provided regardless of the available PV surplus. The AC ELWA 2 can be conveniently configured via the web interface of the Solar-Log Base.

The AC•THOR (0 - 3 kW) and the AC•THOR 9S (0 - 9 kW) are infinitely variable control devices for hot water, electrical heat sources and optional heating. For example, in combination with the Solar-Log™, the AC•THOR or AC•THOR 9S photovoltaic power manager controls an already installed heating element or a new screw-in heating element (often called a heating cartridge), depending on the PV energy and hot water requirement - for maximum self-utilisation! The same is also possible with the AC ELWA 2, where power electronics and heating element are combined in one product - also possible using Solar-Log™.

Decisive Advantages for the Plant Owner

  • Stepless control for optimal energy utilization.
  • Simple communication via Ethernet and operation thanks to the display.
  • Easy to service and maintain due to removable electronic component.
  • Simple and fast installation, easy to retrofit in existing systems.
  • Can be installed in hot water and buffer storage tanks.
  • Grid-connected PV systems without storage achieve on average only 30 % self-consumption. In an average household (5 kWp PV system) the self-consumption can easily be increased up to 75 % with the AC ELWA 2.
  • The AC ELWA 2 is a compact device - apart from the power connection and the network cable to the Solar-Log™, no other connections are required.
  • When the set temperature is reached, the PV power can be used for other consumers.
  • A maximum of 6 AC ELWA 2 can act together.

Effective Use of the PV Surplus

Solar-Log™ in Combination with a Heat Pump

The combination of photovoltaics and a heat pump offers further potential for optimizing self-consumption of electricity. The basic idea is that a heat pump is supplied with surplus PV electricity. Depending on how the heat pump is connected to the Solar-Log™, either an enable signal or a power surplus is reported to the heat pump. Due to the integration of different protocols, the Solar-Log™ is compatible with various heat pump manufacturers.

For example, the protocol connection for the IDM heat dummy also includes the transmission of yield forecast data. Based on weather forecasts, Solar-Log WEB Enerest™ calculates an individual yield forecast for today and the next two days.
The IDM heat pump takes the data for the next 12 hours into account and can thus work in a forward-looking manner and as efficiently as possible.

Decisive Advantages for the System Owner

  • Intelligent control of the heat pump enables optimal use of surplus electricity.
  • The building can be used as a buffer storage.
  • Particularly suitable for buildings with low heating capacity (energy-efficient building envelope).
  • Depending on the selected comfort mode, the IDM heat pump controls the set temperature in the rooms.
  • Modern heat pumps operate completely emission-free at their installation site: no soot, no smoke and no wood dust pollute the air.

Charging Efficiency

Charging Pole E-Mobility with Solar-Log™

The combination of a photovoltaic system, a Solar-Log™ device, and a charging column makes e-mobility even more efficient. The interaction of these three components ensures that the electric vehicle is always charged, cost-effectively, and environmentally friendly, with the maximum available share of photovoltaic power. If there is not enough excess electricity available, the charging process is not interrupted due to the Solar-Log™ function "surplus/ minimum charge".

The combination of a photovoltaic system, a Solar-Log™ device, and a charging station, such as the one from Keba, makes electromobility even more efficient. Thus, the "surplus/ minimum charge" function ensures that the vehicle is charged reliably and yet in a cost-optimized manner.

Decisive Advantages for the Plant Owner

  • The Solar-Log WEB Enerest™ portal records and clearly visualizes the charging station data.
  • The interaction of the PV system, Solar-Log™ and charging station ensures that the electric vehicle is always charged, cost-effectively, and environmentally friendly with the maximum available share of photovoltaic power.

Targeted Control of Consumers

Smart Energy Logics and Devices for Solar-Log™

With the help of the Smart Energy Logics, settings for individual circumstances can be made, for example, activating additional loads at a certain surplus value. Different devices are available for the physical switching of the loads. Depending on the purpose, the potential-free, internal relay of the Solar-Log™ can be used, for a Smart Plug, the Smart Relay Box or the Smart Relay Station. A consumer can be controlled directly via the internal relay of the Solar-Log™ Base. The relay can switch devices with a maximum supply voltage of 24 V at a current of up to 2 A. With the Smart Relay Box, the Solar-Log™ is extended by eight potential-free relays. The Smart Relay Station can switch up to three consumers directly and additionally record the consumption via the device-internal counter.

The Solar-Log™ Smart Relay Box

  • Via the Solar-Log WEB Enerest™ Portal the data of the charging station are recorded and clearly visualized.
  • It is connected to the Solar-Log™ via RS485.
  • Suitable in combination with load relays for controlling motors, pumps, ventilation, and air conditioning systems.
  • Free RS485 interface required.

The Solar-Log™ Smart Relay Station

  • Has 3 relays to directly switch loads up to 16A/230V.
  • Receives feedback on consumption values from each relay.
  • Connects to the Solar-Log™ via Ethernet.

Making Optimum Use of the Electricity Generated

Solar-Log™ and Combined Heat and Power Generation

Solar-Log™ can record and visualize the production of a device with combined heat and power using energy meters. To do this, only two energy meters need to be connected to the Solar-Log™. One energy meter records the current production output and the second meter records the consumption. In the event of a high heat demand, the running time of a cogeneration device can be shortened in conjunction with intelligent electricity consumers, such as the AC ELWA 2, and the electricity produced by the cogeneration device can be optimally used as heat. This avoids unprofitable feed-in to the power grid, and thus the Solar-Log™ can be used as a central monitoring and control element.

Decisive Advantages for the Plant Owner

  • Recording and visualization of the generator output of a unit with combined heat and power and PV system.
  • Avoidance of unprofitable excess feed-in through intelligent consumers.
  • Production and consumption times can be coordinated.
  • Connection of a device with combined heat and power takes place depending on the current power consumption situation and enables a more efficient utilization, for example in the summer months.

The Solar-Log™ Smart Visual Concept

Clever Visualization of Consumption and Self-Consumption

Solar Log™ offers the Smart Visual concept to visualize consumption and self-consumption in larger joint projects and for different user groups. Among other things, this can be used to meet the requirements of subsidy programs (e.g. KfW 40 Plus subsidy).

Furthermore, it is an ideal tool to let your tenants* participate in the energy turnaround and to show them directly the added value of a decentralized, renewable energy production. With the Solar-Log™ Smart-Visual concept, yield - consumption and self-consumption within an area or building can be divided into different sub-areas. Each user group sees the relevant share of consumption, production, and self-consumption, and can thus quickly see what advantages a "common" photovoltaic system can offer them.

Current Visualization Levels in the Solar-Log™ Smart Visual Concept:

  • Visualization of the photovoltaic system: actual values of current generation / total power consumption / feed-in.
  • Visualization of a sub-area (i.e. a residential unit): actual value of current power consumption.

With the scope shown here, you fulfill the visualization requirements for the Kfw 40 Plus subsidy!

*The system solution shown is not suitable for implementing tenant electricity concepts!

Build your Smart-Visual concept visualization in seven steps using the example of a Kfw 40 Plus house:

  1. Build the PV system with Solar-Log™ components and http transmission to the Solar-Log WEB Enerest™ portal 4.
  2. Set-up of the housing unit visualization with Solar-Log™ 50 and http transmission + meter Solar-Log™ PRO1 (single-phase) or Solar-Log™ PRO380 (three-phase) (connection via RS 485).
  3. Creating the PV system / Solar-Log™ Base in the Solar-Log WEB Enerest™ 4* portal.
  4. Create the Solar-Log™ 50 / residential units in the Solar-Log WEB Enerest™ 4 portal.
  5. Create the tenants as users and app users in the Solar-Log WEB Enerest™ 4 portal.
  6. Assign the entire PV system, plus the respective residential unit to the tenant (user) in the portal.
  7. Tenant receives an email for password assignment and can then download the Enerest™ ToGo app for visualization of generation / feed-in and self-consumption.

These are your Solar-Log™ Advantages

  • Fulfillment of KfW 40 Plus requirements for eligibility by means of visualization of the PV system, as well as electricity consumption.
  • Scalable to an unlimited number of residential units.
  • Visualization of the energy balance of the PV system, as well as the electricity consumption of the respective residential unit.
  • Simple installation through plug & play.
  • Cost-effective implementation.
  • Free use of the Enerest™ ToGo app by residents.
  • Modular expandable system.