SIGMA BESS · battery energy storage for businessLast week you could have made2,932 € with a 2,170 kWh battery
… if your site had our battery. Not a forecast — a calculation on real exchange prices and the optimal charge and discharge schedule.
See how it connects to your siteHow the battery connects to your site
Pick a setup and watch how energy flows through the day — from the grid, from PV and from the battery.
Own consumption
The battery sits behind the meter and takes over the expensive hours. The site buys power when it is cheap and runs on the battery when it is expensive.
PV + own consumption
Solar powers the site and the surplus is stored instead of being exported at a low midday price.
Consumption + sale
The battery serves the site and sells the rest to the grid when prices peak.
Standalone trading
A battery connected straight to the grid, with no site behind it. It trades on the exchange and provides balancing services.
Solar park add-on
The battery is added to an existing solar park and shifts sales from the cheap midday to the evening peak.
Island mode
When the grid fails, the battery becomes the grid — it sets voltage and frequency and the site keeps running.
Applications of BESS battery storage
Peak shaving, renewable integration, demand response, grid enhancement and microgrids — including the most demanding application of all, Frequency Containment Reserve.
Grid balancing (FCR, aFRR)
A turnkey package with the EMA architecture and a Kehua PCS, compliant with TSO requirements.
Learn moreIndustrial arbitrage
Charge off-peak, discharge at peak — direct savings on time-of-use tariffs.
Learn morePV self-consumption
Use your own solar after sunset instead of exporting it cheaply.
Learn moreDay-ahead arbitrage
Dispatch against exchange prices, with working modes in 15-minute intervals.
Learn moreMicrogrid and island mode
Plug-and-play island microgrids up to 3 MW and 12 MWh with automatic switching.
Learn moreEV charging stations
Buffer fast-charging peaks and keep charging during outages.
Learn moreOnline UPS and data centres
Lithium UPS up to 625 kW / 1,305 kWh with zero transfer time.
Learn moreTransformer enhancement
Dynamic capacity support that defers replacement and extends equipment life.
Learn morePowerSync — EMS with SCADA configuration
Energy management for industrial, renewable and grid applications — simple to commission, reliable in operation and fully under your control.
Two-step setup
Set the number of cabinets and an ID for each, connect power and communications — the system is ready.
Siemens PLC at the core
Control built on Siemens PLC technology — a global standard for dependability.
Local control and cybersecurity
Run offline on your own server, connecting only when remote maintenance is needed.
Preinstalled scenarios
Self-consumption, arbitrage, transformer enhancement, microgrid, UPS and FCR — pick a mode and start.
Cloud with access hierarchy
A four-tier user system for sites and teams, with centralised monitoring when connected.
Grid requirements and FCR
Frequency Containment Reserve demands precise and fast response. The systems cover the following connection and grid-support parameters.
Frequency and active power
Grid functions
Engineering support beyond the box
No two projects are alike — site conditions, voltage levels and grid requirements differ. Every project comes with localized engineering deliverables.
Localized design package
Grid-compliant single-line diagrams, cabling diagrams and foundation drawings.
BOM and component matching
A parts list matched to site voltage, existing PV and PCS type.
Grid interconnection support
Documentation prepared for DSO approval.
Installation guidance
On-site wiring guidance, interface setup and functional testing.
Commissioning
Local or remote support at start-up, as the project requires.
Training and handover
Structured knowledge transfer to the operations team.
Certified at every level
Systems delivered in more than 50 countries, with compliance at company, connection and battery level.
Quality, information security and occupational health and safety.
European and national requirements for generating and storage plants.
Cell and system safety, transport testing, fire behaviour and EMC.
Completed BESS projects
Systems delivered in more than 50 countries. Some projects are shown with partial information for confidentiality. Click a card for details.
100 MWh
A system of about 100 MWh for 24-hour off-grid operation.
3,4 MW / 7,1 MWh
A grid-connected project in Finland for internal load coverage.
2,5 MW / 6,8 MWh
A Mediterranean project built with containerised systems.
2,5 MW / 5 MWh
A second grid-connected project in Finland with Uninterruptible Power Supply (UPS) functionality.
2,2 MW / 5,1 MWh
An industrial site with battery storage for internal load coverage and excess energy sales.
100 kW / 261 kWh
An EV charging site buffering its power peaks.
350 kWp / 699 kWh
A PV plant with batteries built for energy sales – 3 liquid-cooled FFD Power batteries, fully automated with Electro Manager.
100 kW / 233 kWh
A 233 kWh FFD Power battery at a private hydro plant – UPS backup when the grid fails and energy export back to the grid.
BESS systems and energy storage batteries
Standardised cabinets and containers with LFP cells, liquid cooling and integrated EMS, PCS, BMS and fire suppression. Click for the full specification and the calculator.
ECO-B20FT5015LP-2
5.015 MWh, 20 ft battery container for large industrial and grid projects.
ECO-E20FT2170LP-2
20 ft container with batteries, PCS, EMS and fire suppression in one unit.
ECO-E418LP-A40 / A69 / A80
418 kWh cabinet with three output options — 400, 690 and 800 V.
ECO-E261LP-2A
Compact 261 kWh cabinet for a 400 V connection.
Galaxy 233L-AIO-2H
100 kW / 233 kWh cabinet with CATL cells and a Kehua PCS.
Galaxy 261L + 100 kW
All-in-one microgrid with a hybrid inverter for island operation.
BESS articles and guides
Explained in plain terms: how energy storage batteries work, how they are sized and where the revenue comes from.
What is a BESS and how does a battery energy storage system work?
A BESS is a battery energy storage system. We explain what it is made of, how it works, what businesses use it for and how to choose one.
Read the article →A battery for a business PV plant: how to size it
How to choose a battery for a company PV plant: what data you need, how capacity and power are calculated, and the common mistakes.
Read the article →Energy arbitrage with a battery: how to earn from hourly prices
What energy arbitrage is, how a battery earns from the spread between cheap and expensive hours, what reduces the profit and how to calculate it.
Read the article →FCR and aFRR: how a battery earns from grid balancing
What FCR and aFRR are, why batteries suit balancing services, how the reserve is paid and what a battery needs in order to take part.
Read the article →Contacts
Send us the connection point, load profile and target application. We return a sized configuration, a single-line diagram and an indicative price.
kris@sigmabess.com
+359 896 703 574
nikola@sigmabess.com
+359 888 870 484
Sofia Blockchain Capital Ltd — authorized FFD Power distributor for the European markets through the SIGMA BESS brand · Sofia, Bulgaria
Frequently asked questions about BESS and energy storage batteries
Short answers to the questions companies ask most often before choosing a battery.
What is a BESS?
A BESS (Battery Energy Storage System) is a battery system that stores electricity. It charges when power is cheap or when solar PV produces a surplus, and discharges when prices are high or the grid goes down. A system combines LFP battery cells, an inverter (PCS), a battery management system (BMS), an energy management system (EMS), cooling and fire suppression.
What do businesses use energy storage batteries for?
The six most common uses are: storing the midday solar surplus for the evening, arbitrage on hourly exchange prices, peak shaving, backup power and island mode, grid balancing services (FCR and aFRR), and powering fast EV chargers where the grid connection is limited. One battery can combine several of them.
See also:Industrial arbitrageGrid balancing (FCR, aFRR)EV charging stations
What size battery do I need for a solar PV plant?
It depends on the midday surplus, the evening consumption and the grid connection capacity of the site. We offer cabinets of 233, 261 and 418 kWh and containers of 2170 and 5015 kWh. Send us your load profile and the plant data and we will size the battery for your site.
How much does a battery earn and how fast does it pay back?
It depends on the spread between cheap and expensive hours on the exchange and on how the battery is used. At the top of this page you can see the result on real exchange prices from the last 7 days for each of our models, and every product page has a calculator for your own PV and load. For an exact payback period, send an enquiry and you will get a calculation for your site.
See also:Day-ahead arbitrage
How long does an industrial battery last?
The batteries use lithium iron phosphate (LFP) cells rated for more than 8,000 cycles, with 89% round-trip efficiency. At one full cycle a day that is over 20 years of cycling; actual service life also depends on the operating mode and temperature.
Are energy storage batteries safe?
We use LFP cells, which withstand overheating better than other lithium chemistries. Every system has liquid cooling, a battery management system (BMS) and built-in fire suppression. The ECO-E20FT2170LP-2 container is certified to UL 9540A, and the manufacturer is certified to ISO 9001, ISO 27001 and ISO 45001.
See also:ECO-E20FT2170LP-2
Can the battery power the site during an outage?
Yes. Models with island mode take over the load when the grid fails and set frequency and voltage themselves, and the Galaxy 261L switches automatically between grid and island mode. The battery can also work as an online UPS for sensitive loads and data centres.
See also:Microgrid and island modeOnline UPS and data centres
What does a SIGMA BESS delivery include?
SIGMA BESS is an authorised distributor of FFD Power. We design, supply and commission the system: sizing to your load, a single-line diagram and project package, support with the grid connection, installation guidance, commissioning and training for your team.
Who is behind SIGMA BESS?
SIGMA BESS is the brand under which Sofia Blockchain Capital Ltd, based in Sofia, Bulgaria, supplies battery energy storage systems in Bulgaria and across Europe. The company is an authorised distributor of FFD Power for the European markets. For every quote, the team sizes the system to the site's load, solar PV and grid connection.