ATEN is AGreatE’s line of all-in-one Commercial Battery Energy Storage Systems (BESS) for commercial and industrial applications. The ATEN product line covers a wide variety of energy storage needs and can scale from a 30 kW inverter with 64 kWh of storage to a 500 kW inverter with 1000 kWh of storage. ATEN is designed for either grid connected or totally off grid applications and offers commercial and industrial customers turn key energy storage systems that are designed for 10+ years of hassle free usage.

ATEN pairs seamlessly with a number of different energy sources. Typically Solar, Grid, and Diesel Gensets are paired together to make mini-grid applications.


Battery Pack

ATEN 9.2kWh Battery Pack

The ATEN P9 battery pack is based on Lithium Iron Phosphate Cell technology.  16 cells are configured 2 parallel/8 in series.  The duct free design and active ventalation design ensures better cooling efficiency and longer life spans (5000 cycles with up to 1C rating).

AGreatE's P9 9.2kWh LFP Battery Pack for BESS Systems
High Voltage Control Unit

High Voltage Control Unit

R138 HVU is a multi stage charge protection device that offers duel channel power supply and safety disconnect functionality (160 to 205 Amp circuit breaker with 250 Amp fuse).  Designed with a 10 year operational life expectancy.

AGreatE's High Voltage Drawer Unit for BESS Systems
Battery Rack

ATEN P9 Rack

AGreatE's ATEN-R138 Battery Rack is a reliable, long cycle life, modular, and scalable lithium iron phosphate (LFP) battery energy storage system.  Perfectly integrated as a (BESS) building block for PV + BESS + Charging applications.

AGreatE's ATEN R138 Battery Rack for BESS Systems
PCS and DC/DC Converter

PCS and DC/DC Converter

At the heart of the power system is the bi-directional power conversion system which supports grid, PV, and gensets and includes a built in transformer & STS (static transfer system) to control.  Utilizing a modular design, the DC/DC converter can be configured with shared or separate DC bus for the PV and battery system.

AGreatE's Power Control System, PCS for BESS Systems
Smart BESS Controller

Smart BESS Controller

The BESS Controller is the brains of the system.  A complete data acquisition system designed with multiple overload and reverse power protections.  With a built in HMI this system enables the complete control and overview of the BESS system.

AGreatE's BESS Controller for Battery Energy Storage System
BESS System Monitoring

BESS System Monitoring

Cloud Based EMS enables a comprehensive view of real-time data, historical data, reports, and energy forecasting.

AGreatE's BESS Monitoring System Software on a Computer or Laptop
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C&I BESS Systems Include

All AGreatE BESS solutions are pre-engineered to be ready to install.  Each BESS includes:

  • Battery Packs
  • Battery Racks & Wiring
  • BESS Controller with Battery Management System
  • High Voltage Units
  • Power Conversion System (PCS) (DC/AC)
  • PV Inverter (DC/DC)
  • Transformer
  • STS
  • Storage Container
  • HVAC System
  • Fire Suppression System
  • Installation Manuals, Certificates, Usage Guide, etc.

ATEN BESS Sizing Chart

ATEN BESS series Sizing Chart


RE Operation

PV & BESS Operation – Off-Grid

  • PV and BESS can jointly power the load
  • PV powers load, excess energy to BESS
  • Grid is off
  • DG is off


BESS Power Operation – Off-Grid

  • BESS provides energy
  • If BESS energy is too low, Genset will activate at SOC<20%
  • If Genset is activated
  • PV is off (nighttime)
  • Genset is off until activated
  • Grid is off

Genset Operation

Genset Power Operation – Off-Grid

  • Genset charges BESS
  • Genset provides power to the load
  • PV is off
  • Grid is off
  • Once BESS is charged Genset turns off

PV + Genset Operation

PV + Genset Power Operation – Hybrid

  • Genset charges BESS
  • Genset provides power to the load
  • PV is off
  • Grid is off
  • Once BESS is charged Genset turns off

Grid Only Operation

Grid Power Operation – On-Grid

  • Grid is on
  • Grid powers loads
  • Grid charges BESS
  • Genset is off
  • PV is off

PV + Grid Operation

PV + Grid Operation – Hybrid

  • Grid is on
  • PV powers loads (Grid makes up)
  • PV is on (excess power to BESS)
  • Grid can charges BESS
  • Genset is off


AGreatE offers multiple warranty options on all its BESS systems. From the pack level to the entire system, your system will always be backed by a robust set of warranties that will ensure long and trouble free operation.

Battery Cells6000 Cycles
PCS5-10 Years
BOS Components5-10 Years
Battery System5000 Cycles

BESS Certifications

IEC 62619, UN 38.3, CE, UL 9540 and UL 9540A, UL1973

Quality Assurance

AGreatE’s innovative BESS production facility carefully checks and inspects all BESS components. By using our previous knowledge of the certification industry (TUV), AGreatE has established a quality assurance inspection program which prevents potential manufacturing defects and ensures the electric codes and standards for each specific market are followed. The outcome of this program has been highly beneficial to BESS performance, channel partners and end users who all install our products.

AgreatE offers complete quality Assurance on all its product lines by adding a second layer of inspection during kit manufacturing at our facilities.