Storing solar power with the PIKO BA System – smart, communicative, independent

Photovoltaics are a safe, renewable and sustainable source of energy. The solar modules on the roof work with the inverter to transform sunlight into usable energy. However, this solar power isn't generated all the time – only when the sun shines. So what happens after the sun goes down?

With the PIKO BA System storage solution (consisting of a battery inverter and an external battery), you will have solar power round the clock. The PIKO BA inverter converts the energy produced into usable solar power, which can be stored as required in the PIKO Battery, a storage unit made by fortelion, or the BYD B-Box high-voltage battery, until you need to use it. This enables you to increase your level of self-consumption and cut your electricity costs.

Make smart use of your energy through more self-consumption

The solar power produced and stored throughout the day enables you to watch television or cook at any time without purchasing extra electricity. The PIKO BA smart energy management system works together with the PIKO BA Sensor to respond to varying household requirements fully automatically and with no inconvenience for the user. You have a guaranteed supply of power at all times assuming maximum self-consumption.

How does it work?

The PIKO BA Sensor measures the amount of power your household needs. The battery inverter's smart energy management system distributes the power to where it is required. And this enables you to reduce the amount of power you have to buy from an external source. 
On sunny days, your 5 kWp photovoltaic system is able to output 5 kW. Legal regulations, however, mean your inverter has to restrict this power to 70%. Your PIKO inverter uses the PIKO BA Sensor to detect your actual household consumption. The energy used directly can be added to the limited amount (70%), thus allowing you to fully exploit the power of the PV system and avoid limitation losses.

Transform your house into a Smart Home with the world of communication possibilities offered by PIKO BA

Get to know how energy flows through your home better with the help of the KOSTAL (PIKO) Solar App and the KOSTAL (PIKO) Solar Portal. Both show you the energy you have available, as well as your level of power consumption and self-consumption, so you can use your household appliances when solar power is present, thus optimising your self-consumption. 
With EEBus networking technology, your household appliances can also communicate with one another, regardless of the manufacturer. Your home's existing infrastructure is used, so there is no need for any remodelling work. Energy is put to efficient, intelligent use in your Smart Home.

Make yourself more independent and be kind to your wallet at the same time

With the PIKO BA System, you can store the solar power you produce and utilise it round the clock. You thus determine your own electricity price for the next 20 years. The PIKO BA System has been designed to perfectly meet homeowners' needs. Here, system performances of between 4 and 11 kWp are optimal. With the high usable storage capacity of up to 8.6 kWh, you can become more independent of your energy supplier and meet up to 60% of your annual power requirement through your PV system (depending on your individual energy consumption). So you can significantly lower your electricity bills and feed your piggy bank instead!

Store your solar power in external batteries –
PIKO Battery Li or BYD B-Box

Safety is our priority with the PIKO Battery Li – for 15 years, guaranteed

The PIKO Battery Li has been designed by the inventor of the lithium cell. It is based on extensive experience and meets the high quality standards of the KOSTAL Group. That's why we are able to provide a generous 15-year warranty for our storage modules.

  • This lithium battery achieved a maximum of 150 points on the Karlsruhe Institute of Technology safety checklist.
  • The PIKO Battery Li has also been tested against the "Safety guidelines for lithium-ion domestic storage systems" published by the Bundesverband Solarwirtschaft e.V. (the German Solar Association).
  • In 2015, the battery won the ees AWARD for its safety concept.


The PIKO BA System Li storage system can be individually scaled, so it can match any needs perfectly.

Existing PIKO BA inverters can be retrofitted with a fortelion lithium-ion storage system with great ease.

The B-Box H from BYD: space-saving and modular

The BYD B-Box H comes in five power classes between 6.4 and 11.5 kW and is excellent value for money. Thanks to its modular design, installation is also quick and easy.

You can find more information at

Reliable energy thanks to the
PIKO BA Backup Unit

What would work today without electricity? Practically nothing. The smart PIKO BA Backup Unit makes sure that your entire home will still have electricity even if there is a power cut. You experience no inconvenience and it will only be a matter of seconds before all your household appliances are back up and running: you can watch TV, cook and the heating still works.

Expand the PIKO BA System so it is customised to your exact needs and your family is never left in the dark. The PIKO BA Backup Unit is a very simple way to extend and upgrade your storage system.

See here for an example of how the Backup Unit can be used.

Your contribution to a cleaner future

Demonstrate your social responsibility and think about future generations now. With your cleanly produced electricity, you help bolster the success of the energy revolution and protect the environment.

KOSTAL is aware of its environmental responsibilities too and by satisfying stringent take-back and recycling requirements promotes a sustainable approach to the use of resources.
In Austria, you can also tap into additional funding from the Austrian storage programme, so your investment in a PV system will pay off even faster.
Of course, our PIKO BA System storage system fulfils all aspects of the more stringent requirements introduced by the German Federal Ministry for Economic Affairs and Energy's new incentive programme for funding battery storage systems. This also applies to the stipulated fair-value, time-related replacement guarantee for the PIKO Battery, which we provide at no extra charge.

Product features


  • Available in three power classes: PIKO 6.0 BA, PIKO 8.0 BA and PIKO 10 BA
  • Integrated energy management system
  • Provision of grid services, in particular reactive power, active power reduction according to VDE-AR-N 4105
  • Three-phase grid feed-in
  • Future-oriented, as fully equipped for new storage technologies
  • Integrated communication and monitoring package
  • Two independent MPP trackers
  • Relay control of self-consumption; with EEBus capability
  • Dynamic active power reduction with PIKO BA Sensor
  • Visualisation via PIKO Solar App and PIKO Solar Portal
  • Five-year warranty

PIKO Battery Li

  • 15-year warranty for the storage modules
  • fortelion (a trademark of SONY Corporation) is one of the most powerful battery cells available on the market
  • Modular system with three to eight modules
  • Total capacity of 3.6 to 9.6 kWh – available in six sizes as PIKO Battery Li 3.6, 4.8, 6.0, 7.2, 8.4 and 9.6
  • Cell chemistry: lithium iron phosphate
  • High cycle stability (6000 cycles at 80% residual capacity)
  • Rated voltage: 153 to 410 V
  • External dimensions: 1145 mm x 550 mm x 575 mm (H x W x D)
  • Communication interface with PIKO BA
  • Integrated battery management system
  • Calculation of the battery status
  • Triple protection against overcharging
  • Winner of the ees AWARD 2015 for advanced storage technology

PIKO BA Backup Unit

  • Reliable supply during a power cut
  • VDE-tested back-up power function
  • Automatic switchover within a few seconds
  • Three-phase power supply
  • Dimensions: 680 mm x 366 mm x 173 mm (H x W x D)
  • Up to 10 hours of operation at night (with a consumption of 500 W and a fully charged battery)
  • Suitable for consumer loads of 2900 to 4700 W when using the PIKO Battery Li (depending on the number of battery modules)

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