COR.stor · CST-15-70 / CST-30-70 · Available now
70 kWh. Blackout-safe.
The battery that keeps your business and your home running without the grid.
COR.stor is available on its own — or as COR.set, perfectly matched with COR.gen.
COR.setCOR.stor in numbers
80 → 70 kWh
Installed → usable, even after 10 years
~20 ms
Switchover time on blackout
15 / 30 kVA
Power (CST-15-70 / CST-30-70)
5-way
Redundant battery packs
up to 210 kWh
Modular expansion
LiFePO4
Safe, long-life cell chemistry
Warranty
5 + 5
years of warranty on the battery
Five years on the system. Ten on the battery.
COR.stor comes with a five-year warranty, ten years on the battery — for now. And the capacity stays full: because we install 80 kWh of cells and release 70 kWh, the reserve absorbs the natural ageing — your 70 usable kWh remain over the full ten years. Where typical storage systems lose noticeable capacity in that time, COR.stor holds it: no gradual loss, but deliberate design. Our sales team shares the exact terms in your initial consultation.
Limited-time offer. Units ordered before the offer ends keep the warranty term promised.
Why COR.stor is different
Fail-safe
01One pack fails? It keeps running.
Five battery packs work in parallel, each independently protected. If one fails, the storage keeps supplying power — no standstill because one module quit.
With series-connected systems, everything stops instead.
Low voltage
02No high voltage in the building.
Each pack runs at safety extra-low voltage (SELV) instead of high voltage — that reduces risk in the event of a fault and noticeably simplifies installation.
The individual packs can be added at any time — even packs fitted later deliver full output, with no system replacement.
Backup power
03Switched over before a device drops out.
If the grid fails, COR.stor takes over in ~20 milliseconds — your loads keep running without interruption.
It powers the entire property, not a single backup socket. Automatically, without you lifting a finger.
Grid outage? You won't notice a thing.
When the grid fails, COR.stor switches to island mode typically in under 20 ms — faster than a light can flicker. And if the battery were empty: COR.gen is black-start capable, starts without the grid and recharges it — a true island grid, for as long as it takes.
From the home through business and municipalities to agriculture.
One storage, many applications — scalable from a single unit to a networked fleet.
Home
Backup power for the whole house instead of a single socket — heating, hot water, lighting and refrigeration keep running during a blackout.
Business
Peak shaving cuts expensive demand peaks; backup power keeps critical processes and cold chains running.
Municipalities
Security of supply for critical infrastructure — water, communications and administration stay powered when it counts.
Agriculture
Island-capable with solar and generator: milking systems, ventilation and cooling run even without a stable grid.
15 or 30 kVA.
Two variants, one storage: CST-15-70 for the typical family home, CST-30-70 for higher loads and commercial use. Both with 70 kWh capacity.
Lithium iron phosphate.
LiFePO4 instead of classic lithium-ion chemistry: thermally stable and safe, longer-lived, far more charge cycles. The cell chemistry used in stationary grid storage. 80 kWh of cells, 70 kWh of it usable — the reserve never runs to the limit, extending the cells' lifespan.
Plays with any solar array.
The DC link takes your solar directly — one hybrid inverter, one storage for sun and COR.gen together.
Grows to 210 kWh.
Modular design: the storage expands step by step as your demand grows — up to three times the base capacity. For larger properties, multiple units can be bundled into a cascade.
Reference installation
Three COR.stor units.
One utility room, three units, one system — commissioned in 2026. What this page describes as expandability looks like this once it is built: three racks side by side, three inverters above them, run together.
240 → 210 kWh
Installed → usable
3 ×
COR.stor in one system
45 kVA
Continuous power (3 × 15 kVA)
Photograph of a completed installation, July 2026. Image editing: room brightened and cleaned up, equipment unchanged.
Technical data
Full spec sheet.
All COR.stor specifications — expandable by category.
- Type
- CST-15-70 / CST-30-70
- Product type
- Full-hybrid energy storage system
- AC rated power
- 15 kVA / 30 kVA
- Guaranteed capacity
- 70 kWh usable (80 kWh gross)
- Cell chemistry
- Lithium iron phosphate (LiFePO4)
- Design
- Redundant low-voltage system, parallel-pack design (5 × 16S1P in parallel)
- Battery voltage
- 51.2 V DC nominal (45.0–57.6 V DC)
- Charge/discharge rate
- 0.5 C continuous @ 25 °C
- Expandability
- Pack by pack, up to 16 battery packs per inverter system
- BMS
- Pack-based, comprehensive protection (short circuit, over-/undervoltage, temperature, asymmetry, internal resistance …)
- Display
- LCD per battery pack — charge state & status
- Cooling
- Passive (no liquid cooling)
- Enclosure
- Modular all-metal housing, fire-resistant
- Protection class
- IP 44
- Noise
- Not perceptible (no active components)
- Inverter type
- Hybrid inverter (HF power stage), 1 or 2 in parallel
- Rated voltage
- 230/400 V AC, 3P+N+PE, 50 Hz
- Continuous power
- 15 kVA (1 inverter) / 30 kVA (2 inverters)
- AC pass-through (grid)
- 35 A (1 inverter) / 63 A (2 inverters)
- Grid → backup switchover
- typ. 20 ms, max. 80 ms (fault-dependent)
- Island operation
- 15 (1 inverter) / 30 kVA (2 inverters) · overload up to 120 % · load asymmetry up to 100 %
- Anti-islanding protection
- Integrated
- Generator input
- Integrated, 3P+N+PE
- Installation
- No external isolating relay required (inline design)
- PV connection
- Direct via MC4 connector
- Max. DC PV power
- 30 kW per inverter
- MPPT DC power
- up to 24 kW (1 inverter) / 48 kW (2 inverters)
- MPPT voltage range
- 160–650 V DC (nom. 550 V)
- PV inputs
- 2 MPPT, 2+2 inputs per inverter
- Battery dimensions (W×D×H)
- 523 × 800 × 1,357 mm (incl. base)
- Battery weight
- approx. 590 kg
- Inverter dimensions (W×H×D)
- 456 × 750 × 269 mm
- Installation
- Indoor · rack separate from inverter (cable 3 m, up to 10 m)
- Ambient temperature
- Battery nom. +15…+30 °C (max. +5…+45 °C)
- Altitude
- up to 2,000 m
Per technical data sheet · subject to change
Blackout preparedness
87 % expect one day. The state advises fourteen.
In EY's Blackout Readiness Check (January 2026, 1,000 respondents), 87 per cent of Austrians assume the power will be back within 24 hours; more than half expect no more than five. The state recommends stocking up for ten to fourteen days. One household in five has made no preparations at all.
On 28 April 2025, 55 million people on the Iberian Peninsula lost power. It took more than twelve hours to bring the grid back — triggered by a local fault that cascaded. The Austrian armed forces ran the scenario themselves: within the first twelve hours, five of six emergency generators failed.
COR.stor bridges the gap seamlessly — switchover typically under 20 milliseconds — and together with COR.gen keeps the whole property running: heating, hot water, light, refrigeration. No generator set, no diesel, no noise.
Sources: EY Blackout Readiness Check, 13 Jan 2026 · ENTSO-E final report on the Iberian Peninsula outage of 28 Apr 2025 · Austrian Civil Protection Association, Blackout guide
Self-check
How long would you last?
Choose what should keep running during an outage. The calculation runs against 70 kWh of usable capacity, less conversion losses.
Your home runs for
12.9 days
4.9 kWh/day
Civil Protection Association recommends: 10–14 days
Recommendation met.
Guide values for an average household, not a guarantee. Conversion losses of 10 % and a system base load of 0.5 kWh per day are included. Yield from a PV system is not counted — with sunshine the storage lasts longer. Actual consumption depends on appliances, building and use.
Calculate savings & autonomyFAQ
Frequently asked questions
It depends on what should keep running. For a basic supply — refrigerator, freezer, heating pumps, lighting and internet — we reckon on around 4.9 kWh a day; the 70 usable kWh then last roughly 13 days, which covers the ten to fourteen days the Austrian authorities recommend. With COR.gen the calculation no longer ends in days: the CHP unit starts without the grid and recharges the storage as it heats. You can work it out yourself in the self-check on this page.
When the grid fails, COR.stor switches to island mode typically in under 20 ms — faster than a light can flicker. Together with COR.gen it keeps heating, hot water, lights and the fridge running for as long as needed.
Yes. COR.stor is available on its own — as a pure battery storage, also in combination with a PV system. As COR.set it comes perfectly matched together with COR.gen.
LiFePO4 (lithium iron phosphate) is thermally stable and safe — no detonating gas, no acid leakage as with lead. 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's why we install 80 kWh of cell capacity and release 70 kWh as usable. The 10 kWh reserve is your longevity and safety buffer — not a loss, but deliberate design. The effect: where typical systems guarantee only around 70% of their capacity after ten years, your 70 usable kWh stay intact for the full ten years.
Yes, modular and pack by pack — up to 16 battery packs per inverter system. Capacity grows with your needs, even years after installation.
Installation is done together with your electrician: DC-side mounting and commissioning by COR, the AC connection by the electrician. Because the battery packs run at safe extra-low voltage, they can be carried into the utility room individually.
Very little. The storage is passively cooled (no liquid, no fans) and redundant: if one battery pack fails, the storage keeps supplying power. That makes the storage low-maintenance and fail-safe.