Description
The Sol-Ark 18K-2P hybrid on/off-grid inverter delivers reliable whole-home backup, exceptional efficiency, and unmatched flexibility for both grid-tied and off-grid systems. With 18 kW of continuous output and 36 kW surge capacity, it can easily power demanding appliances like air conditioners, pumps, and heavy equipment. Designed to maximize solar integration, the 18K-2P supports over 40 kW of PV through AC coupling and offers three independent MPPT channels for versatile array configurations. Its 48 V battery compatibility with up to 350 A charge/discharge ensures scalable energy storage for any household need.
Built for resilience, the 18K-2P features 97.6% peak efficiency, ultra-fast 5 ms transfer time, and a 200 A grid pass-through for seamless operation during outages. The rugged NEMA 3R/IP65-rated enclosure withstands harsh climates from –40 °C to +60 °C, while stackability up to 12 units allows system expansion. Certified to UL 1741, IEEE 1547-2018, and AFCI standards, it comes with a standard 10-year warranty for peace of mind. Easy-to-use monitoring through the MySol-Ark platform provides real-time visibility and control, making this inverter a powerful, future-ready solution for energy independence and home resilience.
FEATURES
- 18 kW continuous / 36 kW surge power — handles whole-home loads with ease
- Limitless with a 200A pass-through, so a subpanel is not needed
- Modes include whole-home backup, grid sell, meter zero, time of use, or peak shaving
- Ultra-fast transfer — only 5 ms to switch during outages
- Supports smart loads, parallel stacking, or AC coupling to existing PV systems
- Scalable system design — stack up to 12 inverters for expanded capacity
- All-In-One means the Sol-Ark 18k outdoor-rated enclosure is a pre-wired system that contains the inverter, charge controller, auto-transfer switch, monitoring and connection unit all in one package; no fuses, breakers, or combiner boxes necessary
- Sol-Ark inverters are battery agnostic to be used with a wide variety of 48V battery chemistries, from lead to lithium, and up to 350 A charge/discharge
- Easy monitoring — track and control with the MySol-Ark app anywhere, anytime
- Highly Accelerated Life Testing means the Limitless SA-18K is engineered to last well beyond the standard 10 year warranty
- Engineered, Serviced, And Tested In The USA
- Tech support talk to a US-based Sol-Ark Engineer 7 days a week
Videos
-
Sol-Ark Install Guide || How to Setup Time of Use
In this tutorial, we explain how to enable and configure one o...
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EMP Tested: Solar Panels, iPhone, PC & Sol-Ark EMP-Proof Inverter
In this real-world EMP test, we subject solar panels, an iPhon...
-
Enphase vs SolarEdge vs Sol-Ark
In this video we compare the cost and performance of the Enpha...
-
Tesla vs Generac vs Sol-Ark
In this video we compare the cost and performance of the Tesla...
-
Sol-Ark Install Guide || How to Connect a Dongle with Ethernet
In this episode of the Sol-Ark Install Guide, we cover how to ...
Parts / Specifications
Manufacturer: |
Sol Ark |
Model: |
SA-18k, SA-18K-2P-N |
Solar DC Power: |
SOLAR DC POWER |
Max allowed PV power: |
32,400 watts |
Max. Usable PV Power: |
28,800 watts |
Max. AC Coupled Input: |
19,200 watts |
Max PV power to battery & AC outputs: |
18,000 watts |
Max DC Voltage: |
500V@36A |
MPPT Voltage range: |
150V - 425V |
Starting voltage: |
125V |
Max. Short Circuit Current per MPPT: |
54A |
Number of MPPT: |
3/2 |
Solar Strings per MPPT: |
2 without fuses, or 3 with fuses |
Max DC current per MPPT: |
36A@500V, 54A@400V (self limiting) |
Max AC Coupled Input: |
19,200W (Micro/String Inverters) |
AC POWER: |
AC POWER |
AC Output On-Grid: |
18,000 watts |
AC Output Off Grid: |
18,000 watts |
Surge Power (10s): |
36,000 watts |
Connections: |
120/240/208V split phase |
Max. Output Current: |
75A |
Frequency: |
60/50Hz |
Max efficiency: |
97.6% |
Stackable: |
Yes; Max 12 |
Response time: |
5ms Grid-Tied to Off-Grid |
Sell back power modes: |
Limited to Household or Full Grid-Tied |
Design (DC to AC): |
Transformer-less DC |
Power Factor: |
+-0.9 - 1.0 |
BATTERY: |
BATTERY |
Battery Types: |
Lead Acid or Lithium Li-Ion |
Nominal DC input: |
48V |
Capacity: |
50 - 9900Ah |
Voltage range: |
40 - 60V |
Continuous Battery charging output: |
350A |
External temperature sensor: |
Included |
Current shunt: |
Integrated for accurate % SOC |
External Generator Start: |
Integrated based on voltage or % SOC |
Li-Ion Communication: |
CanBus & RS485 MODBUS for Lithium battery |
General: |
GENERAL |
Display: |
Color touch |
Weight: |
137 lbs |
Dimensions: |
(H x W x D) 34.0 x 18.3 x 11.1 inches, 863 x 464 x 282 mm |
Enclosure: |
IP65, NEMA type 3R (indoor / outdoor) |
Temperature: |
-40 to 60C; >45C derating; (3 variable speed fans) |
Warranty: |
10 years |
Wi-Fi Communication: |
Included for monitoring or SW updates |
Snap on sensors: |
Included, for limited selling to household |
PROTECTION: |
PROTECTION |
Certifications: |
UL1741 3rd SB, UL1741 CRD-PCS, IEEE1547-2018 and interoperability using IEEE2030.5, Hawaiian Electric SRD V2.0, UL1699B PVDC AFCI, UL1998, CSA C22.2 No. 107 |
Grid Sell Back: |
UL1741-2010/2018, IEEE1547a-2003/2014, FCC 15 class B, UL1741SA, CA Rule 21, HECO Rule 14H |
PV DC Disconnect: |
Integrated switch NEC 240.15 |
Ground Fault Detection: |
Integrated NEC 690.5 |
Surge Protection: |
DC Type II / AC Type II |
PV rapid shutdown control: |
Integrated NEC 690.12 |
PV Arc Fault detection: |
Integrated NEC 690.11; UL1699B |
PV input lightning protection: |
Integrated |
AC input/output breakers: |
Integrated 200A |
Battery Disconnect: |
Integrated breaker |
Solar Flare EMP Hardened: |
OPTIONAL to 2015 MIL-STD 461G (Independently tested June 2018) |
Sol-Ark SA-18k DATASHEET
