A robust and scalable battery system designed for solar installers, EPCs, and integrators, HELIOS ESS delivers energy storage for off-grid, backup, rural electrification, and light-commercial applications.

High Energy Density. 16 kWh of energy storage per battery saves you money.
Scalable Architecture. Expandable to 580 kWh to meet growing residential or light-commercial demands.
Reliable Performance. 10-year workmanship warranty and a 93 MWh energy throughput performance guarantee.
Certified. UL 1973, UL 9540A, UL 9540 DC ESS 3rd Edition.
HELIOS ESS is a high-performance lithium battery with an intelligent BMS, integrated safety features, and seamless inverter communication — all packaged in an outdoor-rated, scalable, wall-mounted solution designed for backup, off-grid, and distributed energy projects.
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Hassle-free permitting with with UL 9540*, UL 9540A, and UL 1973 certifications and reports. *UL 9540 DC ESS 3rd Ed. Pending
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Safe by design, safe LFP cells, internal dual-stage fire arrestors, RSD input, high current BMS, DC breaker, layered electrical protection — all tested to UL standard
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Fourth Generation BMS with high current Dynamic Charging and Dynamic Top-balancing.
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Seamless inverter integration with a wide range of direct-to-inverter CANbus communication protocols for popular inverter brands.
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Easy unboxing and handling with detachable unboxing rope handles. Optional heavy-duty lifting and positioning handles are available.
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Flexible mounting options with adjustable feet and an integrated wall mounting bracket, indoors or outdoors.
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Install multi-battery systems quickly with a pre-wired battery-to-battery parallel connection kit and an inverter cable kit — no cutting or crimping required.
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Customize battery layouts with optional quick-connect terminals that let you crimp custom-length cables.
Designed for a clean-look installation with Sol-Ark 15K inverters or the inverter of your choice. Secure cable management and enhanced safety.
Pre-sized battery-to-battery and inverter cables, connector kits.
Enhance HELIOS with relay controls and remote access.

For further information or partnership opportunities, please contact us.
Discover sells through solar industry distributors and installers. We do not sell directly to homeowners.
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