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DC coupled storage system

When you install a PV system in your home, you are usually doing it to be independent of electricity suppliers and protect yourself against rising electricity costs. During the day, the photovoltaic system normally generates more solar power than can be consumed in your home. The excess electricity is fed into the public grid. In the evenings or when the sky is cloud covered, you will need to purchase electricity from your supplier. There is a difference when you decide to install a DC coupled storage system directly together with your new PV-system: the solar power stays in your house and you can use it whenever you want.

With a DC coupled storage system, you use solar energy sustainably and your home will be more independent from energy suppliers. You can use your stored solar power in the evenings when the sun is not shining or in the event of a power failure when an RCT Power Switch Box is also installed.

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DC coupled storage system - What is it anyway?

A DC coupled storage system is a storage system that can be added when a new installation of a PV system is planned. It is a so-called battery inverter specifically designed to optimize power consumption. The inverter will save you real money. If you store your solar power you will need to purchase less electricity from your supplier. The DC coupled storage system is generally suited to be deployed in both residential and commercial buildings. However, the prerequisite is that the system is installed at the same time as the PV- system. If you are planning to retrofit an existing PV-system with a battery and a battery inverter you will require an AC coupled storage system instead of the DC coupled storage system.

DC coupled storage system
- direct current is converted to alternating current

The solar modules of a PV-system initially generate direct current. However, this direct current cannot be used in everyday life. Therefore, an inverter that converts direct current into alternating current is required.

If the inverter of the PV-system is coupled with a battery inverter, solar power generated can be stored directly in the battery. The voltage of the individual in series-connected solar modules is adjusted to the voltage of the battery. The DC coupled storage system uses the same inverter to discharge the battery. An additional inverter for the battery is not required. This set up enables the system to feed energy to the house grid or to store it initially in the battery.


DC coupled storage system - properties and build

The input voltages of the system range between 140 V and 600 V. Charging and discharging currents are low. The temperature cycles in the battery are minimal and represent a major advantage. The DC coupled storage system is equipped with two independent MPP solar inputs. A wide voltage range is covered. The mains output is three-phase. The same inverter that is connected to the PV-system is also used for the storage system. It is not necessary to install an additional inverter.

The DC coupled storage system is made up of several components. The battery is a lithium-iron-phosphate battery with an integrated monitoring system. It also includes a battery inverter and a current sensor.


DC coupled storage system - connection

Connecting the DC coupled storage system is in principle a low effort task. It starts by connecting the battery system to the existing DC circuit of the PV-system. The system has an integrated charge controller that feeds the current into the battery. These processes are all interconnected. For the system to work to its optimal capacity all components must be precisely coordinated with each other. In the best case, as provided by RCT Power, they all come from one source.

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