bayrx-station14 March 2025
I purchased one of these 15K units almost two years ago and it has worked flawlessly. It's better than the power company power as it just never goes down for a second.
Sol-Ark 15K-2P 48V All-in-One Hybrid Inverter, 12kW-15kW AC Output, 19.5kW PV Input, UL 1741 & UL 9540 Lithium Battery Inverter
SKU: 15K-2P
Product Summary
The Sol-Ark 15K is an all-in-one hybrid inverter that combines battery inverting, three MPPT solar charge controllers, grid passthrough, and grid sell-back in a single IP65 enclosure. It outputs up to 15kW continuous with solar, 12kW from batteries alone, and passes through up to 200A (48kW) from the grid. UL 1741 SB and IEEE 1547.1-2020 certified with integrated rapid shutdown, arc fault detection, and ground fault detection.
Specifications:
- Continuous output power: 15kW @ 120/240V
- 3x MPPTs, up to 500Vdc max
- 2 inputs per MPPT
- Rated MPPT operating voltage range: 175-425V
- Max. usable input current per MPPT: 26A
- Max. short circuit current per MPPT: 44A
- Max. utilized solar power: 19.5kW
- Max. charge/discharge current: 275A
- Certified to UL 1741 Standards
- Weight: 135lbs
- Dimensions (H×W×D): 31.8×19.4×12in
$5,750.00
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About the Sol-Ark 15K Hybrid Inverter
The Sol-Ark 15K was the first residential hybrid inverter with an integrated 200A transfer switch, and that feature is what makes it a true whole-home backup. Most competing hybrid inverters require a critical loads subpanel, backing up only a fraction of the home's circuits. The 15K connects directly to the main panel and backs up every circuit in the house. When the grid drops, it transfers to battery in 5 milliseconds, fast enough that computers and electronics continue running without interruption.
Power Output by Configuration
Available power from the 15K depends on the system. A system with only batteries outputs up to 12kW continuously while a grid-tied system uses up to 48kW from the grid. When used with solar panels, the 15K can receive up to 19.5kW of solar input, using up to 15kW to power loads and 4.5kW to simultaneously charge batteries.
When connected to solar, the surge capacity of 24kVA is enough to start large items like well pumps or compressors, while still running home loads.
Three MPPT Solar Inputs
Sol-Ark's 15K can take up to 500Vdc from solar panels, and it has three MPPTs with two inputs each. This design optimizes solar use. Shade on one solar panel reduces the power harvest from the entire string, but the three inputs mean shade on one string has no effect on the other strings. To learn more about how shading affects solar panel output, visit the Current Connected solar panel shading trainer.
Time of Use Programming
Different times of day and different seasons may require different power priorities. Utility companies in some locations charge different rates during different times of the day, and the changing seasons alter the solar harvest. The 15K includes TOU (Time of Use) settings to address these changes.
TOU includes six daily time slots for programming the 15K. Variables include battery level and current draw. Most people configure this feature to reduce energy costs by using battery power during peak hours, though it has many other applications.
Generator Start and Smart Load Control
Other configurable settings include two-wire AGS (Automatic Generator Start) and Smart Load control. One integrated terminal controls both these features, though not concurrently. AGS activates the generator when the battery reaches a user-defined level. Smart Load provides power when the battery reaches a defined threshold or when the inverter receives grid power.
IP65 Outdoor Rated Enclosure
The 15K has an ingress protection rating of IP65. This makes it safe for installation inside or outside as it's protected against ice buildup, falling rain, snow, and dust. At idle, the unit produces less than 30dB of noise at 77°F, roughly equivalent to a whisper.
NEC 2020 Rapid Shutdown
The 15K includes integrated RSD (Rapid Shutdown) capabilities. RSD is an important safety feature for firefighters and other emergency personnel. An integrated relay can incorporate an RSD button such as the IMO Rapid Shutdown Initiator. When someone presses the button, the 15K shuts down and sends a shutdown signal to connected RSD devices such as the Tigo TS4-A-F Rapid Shutdown Modules, which works with other RSD products to shut down power at the solar panel.
UL 1741 SB, Arc Fault, and Ground Fault Protection
The 15K carries one of the most comprehensive certification packages available on a residential hybrid inverter. UL 1741 SB (Smart Battery) and IEEE 1547.1-2020 compliance mean this inverter meets the latest grid interaction requirements, including Ca Rule 21 for California and HECO Rule 14H for Hawaii. Arc fault detection (UL 1699B, NEC 690.11) and ground fault detection (NEC 690.5) are both integrated, along with a PV DC disconnect switch (NEC 240.15), Type II surge protection on both DC and AC sides, and an integrated 200A AC output breaker.
Battery Compatibility and UL 9540
This inverter is compatible with many batteries and is UL 9540 certified with the Pytes V5, Pytes E-Box, and the Renon Xtreme LV batteries. Some installations require UL 9540 certification, which evaluates whether the components of an energy storage system can work together safely and how these components must be installed. A local electrician or AHJ (Authority Having Jurisdiction) can provide more information regarding specific installations. The 15K communicates with batteries over CAN bus and RS485 MODBUS.
Parallel and Multi-Phase Configurations
Up to 12 Sol-Ark 15K units can be wired in parallel for commercial or industrial applications. The inverter supports 120/240V split phase, 120/208V three-phase, and 220V single-phase configurations.
Recommended Accessories
Recommended Batteries
Frequently Asked Questions
UL 1741 is the base safety standard for inverters. UL 1741 SB (Smart Battery) adds advanced grid support testing per IEEE 1547, including frequency ride-through, voltage ride-through, and anti-islanding requirements. The SB designation satisfies the stricter interconnection requirements in states like California (Ca Rule 21) and Hawaii (HECO Rule 14H). Having UL 1741 SB on the nameplate significantly simplifies utility approval and permitting for grid-tied installations across the US.
Less than 30dB at 77°F, which is about the volume of a whisper. At higher ambient temperatures or under heavy load, the internal fans increase speed and noise output.
Yes. The 15K supports up to 12 units in parallel. You can start with one inverter and add more as your power needs grow.
The 15K draws 90W when energized but not actively inverting or charging. This is higher than smaller inverters because the 15K runs its monitoring, WiFi, control systems, and internal power supplies continuously. For systems that sit at standby for extended periods (like a pure backup system that rarely loses grid), this adds roughly 2.2kWh per day to your baseline consumption.
Yes, but with caveats. The 15K works with any 48V lithium battery that communicates over CAN bus or RS485 MODBUS, and Sol-Ark provides generic lithium settings for batteries without a specific communication profile. However, using a non-recommended battery means you lose closed-loop BMS communication, so the inverter relies on voltage-based charging parameters instead of real-time current limits from the BMS. This works, but it is less precise and less safe than a fully integrated pairing. Additionally, UL 9540 system certification only applies to specific inverter-battery combinations that have been tested together. If your jurisdiction requires UL 9540, using a battery outside the certified list means the system does not carry that certification regardless of what the individual components are rated for.
The EMP-hardened version adds electromagnetic pulse shielding to the inverter's enclosure and electronics. This protects against damage from an EMP event, whether from a solar coronal mass ejection (CME) or a man-made source. The standard and EMP-hardened versions are electrically identical in every other respect. Sol-Ark is one of the few inverter manufacturers that offers EMP hardening as a factory option. If your installation is purely grid-tied and you are not designing for worst-case grid-down resilience, the standard version is the right choice. If long-term off-grid survivability is a priority, the EMP-hardened version adds a layer of protection that cannot be retrofitted after purchase.
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