Our components for more functionality

When it comes to storage solutions, REFU  provides you with the full support required right from engineering until commissioning - regardless of application. We advise you regarding the appropriate concept for your application and then put it into practice together with you.

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Battery inverter REFUstore 50...100K
The next generation of bidirectional high power battery inverters


  • Drastic reduction in BOS costs
  • Maximum power density
  • Easy serviceability
  • Suitable for 2nd Life Battery Application

The REFUstore 50...100K is based on the new inverter platform from REFU. It is applicable for different voltages. With a rated power of 88 kW at 400V, it is perfectly suited for commercial behind-the-meter applications such as self-consumption optimization or peak-shaving. With a min. DC voltage of 280V, the REFUstore 50K can be used in 2nd life battery applications.

Flexible integration, maximum freedom in planning

Thanks to AC-coupling, the REFUstore 88K can be easily integrated with existing PV systems. The highly modular solution allows it to be used in systems from 88 kW up to MWs in size to meet the demands of both energy and power applications.

This inverter is specifically designed for all high voltage batteries and, allows different communication protocols like Modbus RTU/TCP and Sunspec/
MESA. The higher flexibility in system design reduces BOS costs drastically.

Systemdesign with REFUstore 88K

Important data at a glance

REFUstore 88K (400 VAC) REFUstore 83K (380 VAC) REFUstore 50K (380 VAC) REFUstore 50K (2nd life applications)
Max. DC voltage (V) 1,000 1,000 1,000 1,000
DC voltage range at nominal power (V) 585...900 555...900 555...900 1,46 × Uac...900
AC nominal power (kVA) 88 83,3 50 0,222 × Uac
AC voltage (V) 400 380 380 180 … 400
AC voltage range (V) 180 ... 528 180 ... 528 180 ... 528 180 ... 528
Max. efficiency (%) 98.4 98.3 98.3 96.8

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What are the benefits of storage for you?

Peak Shaving - Compensation of peak loads

The amount of electricity required by every company, whether in office buildings, in the manufacturing industry or on farms, changes not only during the course of a day, but also every day of a week. In general, no specific measures are taken to compensate for fluctuations in demand, which are reported as consumption peaks. In commercial operations, these peak times usually occur at noon and in the evening, while on agricultural holdings they usually occur in the morning and in the evening.
Regardless of when peak loads occur in your company, they usually still determine the price you pay for electricity and thus make a significant contribution to the total cost of the electricity you use. This is because the highest consumption recorded is generally used to determine the electricity price.
Here the use of a battery storage system to cover the energy demand at peak times can mean significant cost savings. If this storage system is also combined with a PV system, the cheaper electricity generated by the PV panels can be used to charge the batteries instead of using the more expensive electricity from the grid. In many cases, peak loads can also be compensated by correlating the power usage patterns with the electricity from the PV system.

Self-consumption optimization - electricity at the right time

In addition to reducing peak loads, a battery storage system of the right size can also be used to optimize your self-consumption. If the electricity you generate from the PV system is not sufficient to cover the load, the electricity is taken from the battery storage. This means that a large part of the electricity you need in the evening can be covered very cost-effectively by the electricity generated by the PV modules during the day. You can also achieve even more savings by operating the battery storage system at the lowest tariff, i.e. charging at the lowest electricity price.
The installation of a battery storage system to increase the amount of electricity generated by small and medium-sized enterprises is an extremely beneficial approach in many places. The benefit of self-produced electricity, i.e. the reduction of the amount of electricity from the grid minus the missing feed-in tariff and the associated savings in electricity procurement costs, is greater than the investment required for the purchase of a storage system for excess PV electricity.




Reduction of grid expansions through energy storage systems

The increased connection of single-phase decentralized loads - such as PV systems on private homes - as well as the increased single-phase charging of electric cars can create asymmetries in the distribution grid, since a large proportion of them are connected to L1. Distribution system operators also have only limited influence on how loads are ultimately connected. Although they specify a uniform distribution across all phases, they are not in a position to check these specifications to the required extent due to the immense personnel-intensive expenditure afterwards.

It is possible that these unbalanced phase currents lead not only to high loads and oversizing of equipment (distribution transformer and cables) but also to the tripping of protective devices. A further grid expansion will also be necessary due to the load limit of only one phase.

By using appropriate energy storage systems, these phase asymmetries can be compensated and savings can be achieved in grid expansion and transformer costs.

System services through energy storage systems

Battery storage systems are particularly well suited for the provision of primary control power, as they achieve fast reserve capacities compared to conventional power plants.  In order to improve their efficiency, they can provide parallel system services such as frequency maintenance or reactive power supply and offer proportionally secured power. With battery prices falling in the future, this not only makes economic sense, but can also lead to a reduction in CO2 emissions due to the reduced use of conventional power plants.