SimpliPHI™ ESS 4.9 kWH Battery

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The SimpliPHI™ 4.9 kWh Battery utilizes advanced Lithium Ferro Phosphate (LFP) chemistry to deliver more efficient, safer and reliable energy storage. Designed and built with versatility in mind, the SimpliPHI 4.9 kWh Battery seamlessly integrates with all leading inverters, making it an ideal solution for battery replacement, expansion of existing systems or as a new installation. This leading-edge power storage solution is also at the core of the Energy Storage System (ESS): the most advanced, safety- certified ESS available for homes and businesses.

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  • Features
  • Specifications
  • Documentation



Long battery life

10,000 cycles at 80% depth of discharge (DoD), 96% round-trip efficiency, 26.8 MWh of energy throughput, with 80% retained capacity.


No ventilation, cooling or thermal regulation required; 15-year limited warranty.1

Scalable for any energy need

Battery can scale to allow for expansion up to 358 kWh for longer-duration storage.

Versatile installation options

IP65 rating supports all weather conditions for both indoor or outdoor installations.

Flexible to pair with leading inverters

Ready to be integrated with SimpliPHI, Sol-Ark and SMA. Other inverters pending.

Validated to industry’s toughest safety standards

UL 1642, UL 1973, UN 3480 and UN DOT 38.3.

LFP battery chemistry

Provides peace of mind by reducing cobalt, risk of thermal runaway with fire propagation, operating temperature constraints and toxic coolants.

Closed-loop communication

Optimizing the inverter performance with ongoing feedback between the elements of the system.

Broad operating temperature

Ability to be used in a variety of temperature ranges.

Proven overcurrent protection

Integrated BMS and 100A DC breaker on/off switch protects the battery from overcharge and discharge, increasing safety during installation and operation.

1See operator’s manual or for complete warranty details.


SimpliPHI 4.9 kWh Battery
Battery Specifications
Model Number SPHI-B-4.9
DC Voltage – Nominal 51.2 VDC
Amp-Hours 97 Ah
Rated kWh Capacity 4.9 kWh DC @ 100% DOD 3.9 kWh DC @ 80% DOD
Max. Surge Discharge Rate (10 minutes) 100 amps DC (5.1 kW DC)
Max. Continuous Discharge Rate 48.5 amps DC (2.48 kW DC)
Max. Continuous Charge Rate 48.5 amps DC (2.48 kW DC)
DC Voltage Range1 48 VDC to 56 VDC
Depth of Discharge1 up to 100%
Charging Temperature1 32° to 120° F (0° to 49° C)
Operating Temperature1 -4° to 140° F (-20° to 60° C)
Storage Temperature 6 months: 14° to 77° F (-10° to 25° C) 3 months: -4° to 113° F (-20° to 45° C)
Self-Discharge Rate < 1% per month (when off)
Cycle Life 10,000+ cycles (@ 80% DOD)
Memory Effect None
IP Rating IP65
Warranty 15 years
Mounting Wall-mount only
Efficiency Rating 96%
Communications CANBUS
Certifications UL 1642, UL 1973, UN 3480 and UN DOT 38.3
Terminals 3/8 in (10 mm)
Battery Cables 4/0 Parallel Connections – Up to 4 batteries per string
Product Dimensions
Dimensions (W x H x D)/strong> 23 x 28.5 x 8.5 in (30 in H w/terminals) /
3.2 ft33 (584 x 724 x 215.5 mm / 0.10 m3)
Weight 160 lb (73 kg)
Wall Mount Dimensions (W x H x D) 17.5 x 22.69 x .95 in (444.5 x 576.2 x 24 mm)

1Maximum operating ranges. Refer to Installation Manual for recommended conditions. All specifications listed are typical/nominal and subject to change without notice.

  • UN3480, Lithium Ion batteries, 9, II
  • Certified to UL 1973
  • UL and CE listed, UN/DOT and RoHS compliant components
  • Manufactured in the United States