German manufacturer Solarwatt says its new battery can be flexibly configured as an AC or DC system. In addition, it has an emergency power function and can only be combined with Solarwatt inverters.
Germany-based Solarwatt has unveiled a new storage system for residential PV systems.
The “Battery vision” system can be configured with a capacity of 5.2 kWh up to a maximum of 18.2 kWh and can be installed as single-phase or three-phase and as a DC or AC system, making the product equally suitable for new installations and retrofits.
The system features BMW lithium iron phosphate cells, stackable in a modular design. It includes a lower and upper unit, each with a capacity of 2.6 kWh, expandable with up to five additional modules of the same capacity.
The nominal DC voltage is 57.6 V, ranging from 40 V to 480 V, with a maximum charge/discharge current of 50 A. The device operates up to 55 C and allows discharge down to -10 C, where charging is limited to 0 C or higher. The IP65 rated enclosure supports outdoor installation.
The battery only works with Solarwatt “Inverter vision one” and “vision three” models. The single-phase inverter offers five power options ranging from 6 kW to 12 kW at the photovoltaic DC input. Each model includes two MPP trackers with one input each, supporting a maximum system voltage of 600 V and a short-circuit current limit of 20 A. The three-phase inverter offers slightly higher performance values for greater capacity.
“The battery absorbs a lot of energy very quickly and can then release it just as efficiently when needed (power rating 1C),” says Peter Bachmann, Chief Product Officer of Solarwatt. “This is, for example, of utmost importance when charging an electric car or operating a heat pump via the storage system. Our new generation of storage systems responds approximately three times faster than comparable products from our competitors.”
The inverters provide single-phase emergency power from the battery and switch automatically in less than 20 milliseconds to ensure uninterrupted supply. Solarwatt said emergency power ranges from 3 kW to 6 kW. The system also enables charging from the grid when dynamic electricity tariffs offer favorable prices.
Passive cooling reduces operating noise to 35 decibels. Solarwatt offers a 10-year warranty on the system, reflecting its commitment to reliability and performance.
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