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- Energy storage systems - ESS
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- Uninterruptible power supplies - UPS
- Inverters
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- Building automation
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Energy storage systems - ESS
Energy Storage Systems (ESS) — Commercial and Industrial Energy Storage
An energy storage system (ESS) stores electrical energy and dispatches it on demand — to connected loads or back to the grid. Energom's ESS portfolio comprises turnkey systems rated from 50 kW to 125 kW, built on LiFePO4 battery technology, from Elecod, Hoymiles, FEB, Pytes, Solis, Roche Energy, and TESVOLT. Thanks to their modular architecture, these systems are scalable to several MW. Each system ships as a complete unit with integrated power conversion system (PCS), battery management system (BMS), and communication interfaces. In our experience, the most common ESS sizing error is underestimating the peak demand profile — correct sizing is the foundation of ESS payback.
How Does a Commercial/Industrial ESS Work?
A commercial and industrial (C&I) ESS consists of three core subsystems: (1) battery modules — the current industry standard is LiFePO4 (lithium iron phosphate) cell chemistry, offering 6,000+ cycle life, -20 to +55 °C operating temperature, and excellent thermal safety; (2) power conversion system (PCS) — performs bidirectional AC/DC conversion for both charging and grid feed-in; (3) battery management system (BMS) — cell balancing, temperature monitoring, overcharge and deep discharge protection. The complete system is coordinated by an EMS controller, which makes real-time decisions on energy flow direction.
Applications
Commercial and industrial energy storage systems deliver measurable savings across four primary applications:
- Peak shaving: the ESS discharges during peak demand periods, reducing the power drawn from the grid. The demand charge component (kW-based tariff element) can account for 30–50% of an industrial electricity bill — reducing it is often the fastest ESS payback path.
- Solar self-consumption optimization: energy generated by the solar system but not immediately consumed is stored in the ESS and discharged during peak consumption. This can raise the self-consumption ratio from 40–50% to 80–90%, minimizing low-value grid export.
- Load shifting / time-of-use arbitrage: the ESS charges during off-peak (low-tariff) hours and discharges during peak-tariff periods — the tariff differential drives the return.
- Backup power: during a grid outage, the ESS provides seamless switchover to battery operation, maintaining supply to critical loads. Certain models in our portfolio (e.g., Elecod Monet-100TS) include integrated UPS functionality and MPPT solar input.
LiFePO4 Battery Technology Advantages
LiFePO4 (lithium iron phosphate) is the global industry standard for C&I energy storage. Every system in our portfolio is built on this chemistry — here is why:
| Parameter | LiFePO4 (ESS) | Comparison: VRLA/AGM |
|---|---|---|
| Cycle life | 6,000+ cycles (at 80% DoD) | 300–500 cycles |
| Expected service life | 15–20 years | 3–5 years (at 20 °C) |
| Round-trip efficiency | 92–96% | 75–85% |
| Operating temperature | -20…+55 °C | -20…+50 °C (derate >25 °C) |
| Energy density | ~150 Wh/kg | ~35 Wh/kg |
| Thermal safety | Excellent (cobalt-free) | Good |
| Maintenance | Minimal | Periodic replacement required |
ESS Sizing Criteria
Selecting the right energy storage system requires evaluating the following parameters:
- Power requirement (kW): peak demand determines the minimum PCS (inverter) rating. Our portfolio covers 50–125 kW.
- Capacity requirement (kWh): the required stored energy, calculated from backup time or peak shaving profile. Our range spans 72–261 kWh.
- C-rate: the ratio of power to capacity (kW/kWh). Peak shaving typically requires 0.5C; backup applications may require 1C or higher.
- Load profile: daily, weekly, and seasonal consumption curve analysis — sizing accuracy depends on this.
- Solar integration: if the ESS operates alongside a solar system, the PV peak power and production profile influence sizing.
- Grid connection: existing connection capacity and utility operator requirements.
- Communication and monitoring: Modbus, CAN, Ethernet — remote monitoring and EMS integration capability.
Manufacturers
Energom's ESS portfolio spans seven manufacturers, from cost-effective solutions to premium European systems:
- TESVOLT (Germany) — premium-grade, German-manufactured systems with outstanding BMS and cell quality.
- Elecod — broad model range across 50–125 kW, including models with MPPT solar input and UPS functionality.
- Hoymiles — HoyUltra series, 100–125 kW power class.
- FEB — PowerPLANT series, with a flagship 125 kW / 261 kWh model.
- Pytes — PI STATION series, 105 kW / 232 kWh.
- Solis — Evercore series, 125 kW / 261 kWh.
- Roche Energy — 105–125 kW power range.
Why Source ESS from Energom?
- System-level approach: we supply solar systems, EMS controllers, inverters, and EV chargers alongside ESS — single-source procurement for complete energy systems.
- Technical sizing: load profile analysis, peak shaving calculation, and solar integration design — project by project.
- Broad manufacturer portfolio: 7 manufacturers, from cost-effective solutions to premium TESVOLT systems.
- European stock: key models ship from our Budapest warehouse with EU-wide dispatch under standard Incoterms (EXW Budapest / DAP).
Browse our ESS systems below, or request a sizing consultation to select the right energy storage system for your project.
Frequently Asked Questions — Energy Storage Systems (ESS)
What is the difference between residential and commercial/industrial energy storage?
Residential ESS systems are typically rated at 3–15 kWh capacity and 3–10 kW power, connected to single-phase or three-phase residential supply alongside rooftop solar. Commercial and industrial (C&I) ESS systems range from 50–261 kWh capacity and 50–125 kW power, designed for three-phase industrial connections. C&I systems are used for peak shaving, load shifting, and high-power backup applications.
How does peak shaving with an energy storage system work?
During peak demand periods, the ESS discharges to supplement grid power, reducing the maximum power drawn from the grid. This lowers the demand charge component (kW-based tariff element) of the electricity bill. For industrial consumers, demand charges can account for 30–50% of the annual electricity cost, making peak shaving one of the fastest ESS payback paths.
Why do ESS systems use LiFePO4 batteries?
LiFePO4 (lithium iron phosphate) is the industry standard for commercial ESS. Key advantages: 6,000+ cycle life (at 80% DoD), 15–20 year expected service life, 92–96% round-trip efficiency, excellent thermal safety (cobalt-free chemistry), and a wide operating temperature range (-20 to +55 °C). By comparison, VRLA/AGM lead-acid batteries offer 300–500 cycles and 3–5 year service life at significantly lower efficiency.
How do I size an energy storage system?
Sizing is based on the load profile, peak demand (kW), required stored energy (kWh), and application type. For peak shaving, the daily load curve must be analyzed: the difference between peak and average demand determines the minimum ESS power rating, and the duration of the peak period determines the capacity requirement. When integrated with solar, the PV system peak power and production profile also influence sizing. For complex systems, expert sizing consultation is recommended.
Is an EMS controller required with an energy storage system?
Not strictly required, but strongly recommended. An EMS (Energy Management System) controller coordinates energy flow between the solar system, ESS, loads, and the grid in real time. Without an EMS, the ESS operates on fixed schedules or simple rule-based logic. With an EMS, the system dynamically adapts to the consumption profile, solar production, and current tariffs — improving overall system efficiency by 20–30%.
