2nd of 8 we've scored in All-in-One Off-Grid Inverters

ECO-WORTHY Liber 18KT 18kW Three-Phase All-in-One Off-Grid Inverter

Name: ECO-WORTHY Liber 18KT 18kW Three-Phase All-in-One Off-Grid Inverter
Brand: ECO-WORTHY
SKU: L03LBKT18KW

SVT Score, Upper

5.9

Usability5.4/10Social6.3/10The SVT Score is placed on its category's range

Versus

5.4

SVT SCORESRead review

An 18,000 W, 48 V all-in-one off-grid inverter charger with 120/208 V three-phase output, 28.8 kW of MPPT input and 360 A charging.

$3,800

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SKU: L03LBKT18KW Category: All-in-One Off-Grid Inverters Brand: ECO-WORTHY

Usability

5.4 out of 10

Capacity10.0

At 18,000 W continuous it sits on the top rung for a 48 V all-in-one, so it scores 10 on capacity.

Efficiency6.0

Its manual's datasheet gives a 97.6 percent maximum efficiency, which alone would reach the top rung, but it publishes no no-load draw (its energy-saving mode is a 25 W load threshold), and one input alone is capped at 6, so it scores 6 on efficiency.

Operating Range5.0

Its peak of 2 times rated power for 10 seconds is 2.0 times its continuous rating, so it scores 5 on operating range.

Features8.0

It has a zero-transfer UPS mode by Eco-Worthy's page, two built-in MPPT controllers, parallel operation of up to 6 units, CAN and RS485 battery communication, SOLARMAN app monitoring through a Wi-Fi stick and a 360 A AC charger, but its output is 120/208 V three phase rather than 120/240 V split phase, so it scores 8 on features.

Verification2.0

No certifier directory (Intertek, UL Product iQ, Certipedia or the CEC inverter list) lists this inverter, by its model name ECO-INV-48V18KWTSR01, and Eco-Worthy's manual shows only FCC and RoHS marks, so it scores 2 on verification.

Warranty & Support1.0

Eco-Worthy's warranty table does not list this model and gives inverter-chargers 1 year, so it scores 1 on warranty and support.

Warranty and returns

Eco-Worthy's warranty page gives most products 1 year and its 12 and 24 V batteries 3 years, for the original buyer only, against 10 years on its 48 V server-rack and PowerMega batteries and 2 years on its all-in-one inverters, both tiered by age.

Price

$3,799.99 at eco-worthy.com.

Summary

Three-Phase power For 208 V sites

The ECO-INV-48V18KWTSR01 is Eco-Worthy's Liber 18KT, a 48 V all-in-one off-grid inverter charger with an 18,000 W, 120/208 V three-phase pure sine wave inverter, two MPPT solar inputs and a 360 A charger for farms, workshops and other sites with three-phase loads.

Verdict

It suits a buyer with three-phase 208 V equipment who wants a large off-grid system, and who will not need 240 V split-phase circuits or outdoor mounting.

Strengths

18,000 W three-phase 120/208 V output
360 A charging from PV or AC
Dual MPPT28.8 kW PV, 600 V input
97.6% maximum efficiency in the manual
Up to 6 units in parallel for 108 kW

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Drawbacks

No 120/240 V split phase208 V line voltage
No no-load draw published
Not on Eco-Worthy's warranty table
Manual lists the Wi-Fi stick as optional
IP20: indoor installation only

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Social score

6.3 out of 10

RedditBrand-level6.0 out of 10

Reddit owners mostly report Eco-Worthy batteries holding their rated capacity and are less sure of its electronics. In an r/SolarDIY thread owners said their 100 Ah batteries tested to capacity and that two 12 V 260 Ah batteries in series stayed balanced for a year (February 2024), a UK owner measured nearly 102 Ah from a 12.8 V 100 Ah battery after a year on standby against 104.3 Ah new (June 2025), and in a Renogy-or-Eco-Worthy thread an owner called its batteries and panels fine and its charge controllers and inverters hit and miss (February 2026).

GoogleBrand-level5.0 out of 10

On DIY Solar Forum, an owner running two Eco-Worthy 5000 W inverters in split phase reported them working fine after a year (January 2025), while a buyer of twelve 410 W panels found 7 underperforming and waited about 40 days for replacements (August 2025), and an owner of five 12 V 280 Ah batteries reported 3 faulty from the start (August 2025). The Solar Lab, which carries an Eco-Worthy affiliate link and a discount code, found the 48 V server-rack battery handled surges beyond its rating but failed its low-temperature cut-off test, and its calls to Eco-Worthy support went to voicemail (2025).

YouTubeBrand-level7.0 out of 10

Every tester found carries a tie. Will Prowse, whose videos disclose paid promotion or free product and carry affiliate links, found Eco-Worthy's $799 48 V server-rack battery passed his deep-dive tests (2025, about 154,000 views). Mike Builds, whose Cubix 100 video is marked as paid promotion and links Eco-Worthy's affiliate program, measured 99.08 Ah at 0.2C and called it a beast (July 2026, about 218,000 views). There's A Trick For That, which links the battery through Amazon affiliate links, drew 315 Ah, 105 percent of rating, from a 12 V 300 Ah (April 2026, about 25,000 views).

AmazonBrand-level7.0 out of 10

Eco-Worthy's Amazon store shows no store-wide rating; its two largest listings read 4.4 from 647 ratings for the 12 V 100 Ah battery and 4.4 from 576 for the 400 W solar kit (October 2026).

User reviewsNot scored

The retailer pool is blank: Walmart lists few Eco-Worthy items, the Cubix 100 with 1 review and the others resold by third-party sellers such as DC HOUSE, and Home Depot, Lowe's and Best Buy carry no Eco-Worthy listing.

Trustpilot

Trustpilot rates www.eco-worthy.com 4.2 from 1,595 reviews on a profile Eco-Worthy claimed in April 2023 and invites its customers to, with 67 percent five-star against 20 percent one-star (October 2026).

Track record

The BBB rates Eco-Sources USA F on 6 complaints and a second, Los Angeles profile, Eco-Worthy Solar Technology, F on 7, neither accredited (October 2026).
No CPSC or Health Canada recall names Eco-Worthy or Eco-Sources, searched in October 2026.

Not countedExcluded

Not counted in any pool: eco-worthy.com's own review widget and community forum, Eco-Worthy's YouTube channel and Facebook pages, the r/EcoWorthy subreddit, its staff posts on DIY Solar Forum, or its Impact, Awin and influencer affiliate programs.

Summary

Brand-level

4.2 on Trustpilot, an F from the BBB, no recalls

Specs

CapacityNot applicable
AC Output6,000 W or more
System Voltage48 V
Panel PowerNot applicable
Charge Current100 A or more
Safety ListingNone verifiable
Cell TypeNot applicable
Low-Temp ChargingNot applicable
Warranty1 Year
MonitoringWired display or port only
Weight118.0 lb

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At a glance

23.36 x 33.40 x 8.47 in
Gen port as second load
19,800 VA max AC output
Generator auto-start contact

Company

ECO-WORTHY is the brand of Xiamen Eco-Sources Technology Co., Ltd of Xiamen, China, which its own pages date to 2007, with a US company, Eco-Sources USA, Inc., in Springfield, Missouri.

Where it sells

It sells direct from eco-worthy.com, which ships US orders from a US warehouse, and through its Amazon and eBay stores and dealers such as Off Grid Stores and Current Connected.

Description

The ECO-WORTHY Liber 18KT (model ECO-INV-48V18KWTSR01, store SKU GW-L03LBKT18KW-1) is a 48 V all-in-one off-grid inverter charger rated 18,000 W continuous (19,800 VA maximum AC output) with a peak of 2 times rated power for 10 seconds, pure sine wave 120/208 V three phase (L1+L2+L3+N+PE, phase voltage settable from 100 to 127 V), 50 A rated output current and a 100 A bypass overload current. It has two MPPT inputs of 14.4 kW each (28.8 kW total), 36 A per input, 600 V maximum input voltage and a 120-550 V MPPT range, and charges at up to 360 A from solar or AC. It works with 48 V LiFePO4, lead-acid and user-defined batteries (40-60 V), self-adapting to the BMS over CAN or RS485, with a generator port that can serve as a secondary load output, a dry contact for generator start, Wi-Fi monitoring through a SOLARMAN stick logger, a 97.6 percent maximum efficiency in its manual, and parallel operation of up to 6 units (108 kW). It is IP20 for indoor use only, operates from 14 to 131 °F (derating above 113 °F), measures 23.36 x 33.40 x 8.47 in and weighs 118 lb. The manual lists in the box a 5 mm hex key, 8 ferrule terminals, a warranty card, the user manual and mounting screws, with a meter and CT optional.