Questions and answers.

COR.stor has 70 kWh of usable capacity and can be expanded to 210 kWh usable. Each unit has 80 kWh of installed cell capacity, of which 70 kWh is usable. The battery measures 523 × 800 × 1,357 mm, needs approx. 0.42 m² of floor space and weighs approx. 590 kg; the inverter (456 × 750 × 269 mm) is mounted separately from it. Output is 15 kVA (CST-15-70) or 30 kVA (CST-30-70).

Yes. Photovoltaics connect directly to COR.stor, via MC4 connectors and with up to 30 kW of DC PV power per inverter. COR.stor stores the solar power and releases it when you need it.

When the grid fails, COR.stor switches to island mode typically within 20 ms and keeps lights, fridge, heating pumps and internet running from storage. How long depends on consumption. In COR.set, the heat and power plant (COR.gen) recharges the storage unit while heating.

Supply during a grid outage is an additional benefit of COR.stor. How long the system supplies power in island mode depends directly on consumption. 70 kWh of usable capacity is available; in COR.set, the heat and power plant can recharge the storage unit while heating during the heating season. For your consumption profile, use the self-test.

Yes. COR.stor is available on its own — as a stand-alone battery storage system, also alongside a PV system. In COR.set it comes matched to the heat and power plant (COR.gen).

LiFePO₄ (lithium iron phosphate) is a thermally stable cell chemistry. Each battery pack has its own battery management with comprehensive protection. It is the cell chemistry also used in stationary grid storage.

A LiFePO₄ battery lasts longest when it is never fully charged or fully drained. That is why we install 80 kWh of cell capacity and release 70 kWh as usable. The remaining 10 kWh are not released in operation: that is easy on the cells and provides a reserve against natural ageing — not a loss, but deliberate design. That is different from the minimum state of charge: this is adjustable and sets how much of the 70 usable kWh you want to keep in reserve for a power cut.

Yes. COR.stor can be expanded modularly from 70 to 210 kWh usable. Larger arrays are designed individually for the specific property.

Yes. In commercial use, COR.stor can cut expensive demand peaks if your tariff includes a demand charge; when the grid fails, COR.stor can keep critical loads supplied. What that looks like at a specific site is something we work out in a site review.

The COR.gen heat and power plant heats with wood pellets and generates electricity as it does so: up to 10 kW of heat and up to 2.2 kW of electrical output from one unit. COR.gen is not sold on its own — it is the generating unit inside COR.set and COR.tainer.

In the heat and power plant, wood pellets burn in a fluidised bed of sand at around 800 °C. The heater heads of two Stirling converters sit in the sand bed: they convert the temperature difference into mechanical and then into electrical energy. The remaining heat goes into the heating system via the heat exchanger — so the electricity is generated while the system is heating.

Up to 2.2 kW of electricity — heat-led, that is during the heating season, while the system is heating. At 8 operating hours that is up to 17.6 kWh a day. How much it adds up to over a heating season depends on the system’s running hours and on your building: the calculator gives a first estimate, and we work it out precisely in the initial consultation.

Buildings that need heat during the heating season and have a plant room — from the family home to commercial premises, hotels, farms and nurseries, through to municipal buildings. The system is the same everywhere; what differs is the demand. The calculator shows what COR.set could do in your building; whether it fits is something we clarify in the initial consultation.

The COR.gen heat and power plant, the COR.stor battery storage system and COR.app, which shows heat, power and storage. Buffer tank and the COR.vac pellet feed are included.

We do not quote a price here: it depends on house size, existing heating system and desired storage capacity, and comes with the quotation. The calculator shows whether and how much you save compared with your current heating. Whether subsidies are an option for your building is something we check in the initial consultation.

It depends on your building, consumption and photovoltaics. You can work out what COR saves you at cor.energy/en/calculator — no registration needed.

Yes. If the grid fails, COR.stor switches to island mode typically within 20 ms and supplies the building. The storage unit provides the grid that the heat and power plant (COR.gen) feeds into: during the heating season COR.gen keeps heating and recharges the storage unit as it runs.

COR.boost is an add-on module in preparation. Two variants are planned: an immersion heater that turns surplus self-generated power into heating and hot water, and a hybrid variant with a heat pump for the mild months. There is no performance data yet; you can find out where things stand in the initial consultation.

The complete COR System in an ISO container: heat and power plant, COR.stor, buffer tank, pellet silo and inverter are integrated and pre-configured in the container. The necessary connections for heat, power and flue gas are made on site.

COR.tainer is in development. There is no delivery date yet. If you have a specific project, let’s talk about it.

Outdoors, next to the building — in the garden or beside the garage, for example. The container is designed to arrive ready-built on a lorry and be set down by crane or forklift; heat and power reach the building by pipe and cable. The connection requirements will follow with the technical release.

A 10-foot and a 20-foot container. The output range is defined with the project.

The COR.gen heat and power plant is serviced yearly or every 2,000 operating hours. No ash drawer to empty. COR Service takes care of cleaning during maintenance. Battery with passive cooling – no fans, no liquid. The inverter has temperature-controlled fans.

Wood pellets to EN ISO 17225-2, class A1. The day hopper holds 40 kg and is filled automatically via COR.vac. At rated load, COR.gen uses around 2.7 kg per hour.

From sawmill residues: offcuts and shavings, pressed into wood pellets to EN ISO 17225-2, class A1. One kilogram contains 4.8 kWh of energy; two tonnes replace around 1,000 litres of heating oil (industry figure from DEPI, the German Pellet Institute).

The heat and power plant (COR.gen) runs quieter than 60 dB(A). The COR.stor battery works without fans and is therefore barely audible; the inverter has temperature-controlled fans and stays below 60 dB(A).

With COR.app: it shows heat, power and storage and alerts you when pellets or a service are due. The system can report faults to COR Service automatically via remote maintenance.

The system can report faults to COR Service automatically. COR Service can check the system status via remote maintenance and in many cases help remotely. If you notice something yourself, open a ticket in the COR.app or contact COR Service: by email to service@cor.energy or by phone on +43 720 720 300, ideally with the serial number and a photo.

A room for the equipment inside the building: COR.gen goes in the plant room, COR.stor beside it or in an adjacent room, in any case indoors; your electrician makes the AC connection. We go through everything else — such as the flue gas routing and the connections for the heat and power plant — for your building in the initial consultation.

COR.gen measures 127 × 92 × 182 cm (D × W × H) and weighs approx. 650 kg. The COR.stor battery needs approx. 0.42 m² of floor space (523 × 800 mm, 1,357 mm high); the inverter is mounted separately from it. Add to that the buffer tank and pellet store; we work out how much space they need in your building in the initial consultation.

Installation is done together with your electrician: DC-side mounting and commissioning by COR, the AC connection by the electrician. The battery consists of five packs that can be carried into the plant room individually; safety extra-low voltage (SELV) makes installation easier.

That is what COR.tainer is intended for: the complete COR System in an ISO container, placed outdoors next to the building. COR.tainer is currently in development.

5 + 5 years’ warranty on the battery. You receive the applicable warranty terms with the quotation.

80 kWh are installed, 70 kWh are usable. The reserve is designed for long-term availability.