RUIXU 51.2V 392Ah 20kWh | Faster Self-heating IP55 Outdoor, Bluetooth OTA, 9500+ Cycles, 10-year warranty | UL1973 | UL9540｜UL9540A | CEC | SGIP

BY: Off-Grid Source

SKU: Lithi2-20

| Availability: BACKORDER: ETA NOVEMBER 25

$3,199.00

Found A Better Price?

Share it with us now and we will beat it. Get the best deal online, guaranteed!

Live Chat With an Expert

Estimated Delivery Between

and .

Order within to get it by the earliest date.

Order within

to get it by the earliest date.

Authorized Off-Grid Source Dealer

Free & Fast Shipping From US Warehouses

Easy 30-Day Returns & Price Beat Guarantee

Lifetime Expert Support

RUiXU Lithi2-20 51.2V 392Ah 20kWh Self-Heating IP55 Outdoor Battery

The RUiXU Lithi2-20 20kWh Self-Heating Outdoor Battery is a high-capacity lithium iron phosphate (LiFePO4) energy storage solution designed for residential solar systems, off-grid living, and light commercial backup power. Featuring a 51.2V nominal voltage, 392Ah capacity, and 20kWh energy storage, this battery delivers dependable performance in a compact, space-saving design.

Built with IP55-rated protection, fast self-heating technology, intelligent battery management, and Bluetooth monitoring, the Lithi2-20 provides reliable operation in demanding environments. Its modular design supports up to 32 batteries in parallel, allowing energy storage expansion up to 640kWh.

Engineered for long-term use, the Lithi2-20 offers 9,500+ rated cycles at 80% depth of discharge, a 15-year design life, and a 10-year manufacturer warranty.

RUiXU Lithi2-20 20kWh Self-Heating Outdoor Battery Features

20kWh High-Capacity LiFePO4 Battery - Provides 20kWh of nominal energy storage with a 51.2V, 392Ah lithium iron phosphate battery, delivering reliable power storage for residential solar and backup applications.

IP55 Outdoor Protection - Features an IP55-rated enclosure designed for suitable indoor and protected outdoor installations, offering resistance to dust and water ingress.

Fast Self-Heating Technology - Equipped with a 1,000W heating system that automatically activates in cold conditions to support battery charging and maintain reliable performance.

Expandable Up to 640kWh - Supports up to 32 batteries in parallel, allowing the system to expand from 20kWh to 640kWh of nominal storage capacity as energy requirements grow.

Intelligent BMS and Bluetooth Monitoring - Features built-in battery protection, smart cell balancing, and Bluetooth connectivity through the RUiXU Battery App for battery monitoring, inverter protocol selection, and wireless firmware updates.

RUiXU Lithi2-20 20kWh Self-Heating Outdoor Battery Applications

Residential Solar Energy Storage – Store excess solar energy for household use and improved energy independence.
Off-Grid Solar Systems – Provide reliable battery storage for off-grid homes, cabins, and stationary solar installations.
Home Backup Power – Supply stored energy to essential household loads during outages when paired with a compatible inverter.
Hybrid Solar Systems – Integrate with compatible hybrid inverters for solar self-consumption and energy management.
Small Commercial Energy Storage – Support backup power, peak shaving, and energy management for small businesses and offices.
Expandable Energy Storage Systems – Connect multiple units to create larger-capacity battery banks for growing power needs.

What's Included

Everything you need is included with your product.

1 x RUiXU Lithi2-20 51.2V 392Ah 20kWh Self-Heating IP55 Outdoor Battery
1 x Battery-to-Battery Communication Cable (250mm)
1 x Battery-to-Battery Grounding Cable (430mm)
1 x Battery-to-Battery Grounding Cable (1500mm)

2 x Woven Lifting Sling
2 x Side Fixing Member
2 x Horizontal Fixed Member
1 x Manual
1 x Warranty Card

Important Notes:

External grounding and inverter communication cables are not included and must be purchased separately according to installation requirements.
The manufacturer's manual also lists positive and negative 0AWG battery-to-busbar cables (1,200mm each) as optional kit materials. Confirm their inclusion with the supplier before adding them to the standard package contents.

Warranty

10-Year Manufacturer Warranty

RUiXU Lithi2-20 20kWh Self-Heating Outdoor Battery Specifications

ELECTRICAL SPECIFICATIONS

Specification	Details
Nominal voltage	51.2V
Nominal Capacity	392 Ah
Nominal Energy	20 kWh
Operating voltage range	44.8 V~58.4 V
Charge voltage	56.5 V
Float voltage	54.6 V
Recommended charge current	150 A
Max. charge current	200 A
Recommended discharge current	150 A
Max. discharge current	200 A
Communication	RS485 / CAN / Bluetooth
Peak discharge current	240 A / 15 s, 300 A / 1 s
IP rating	IP55
Cycle Life @ 80% DoD	≥ 9500 cycles
Design life	15 years
Operation temperature	Charge：-22°F～140°F（-30～60°C） Note：Heating turns on during charging when the temperature drops below 41°F. discharge：-22°F～140°F（-30°C～60°C）
Storage temperature	Min: 14°F (-10°C) Max: 113°F (45°C

MECHANICAL SPECIFICATIONS

Specification	Details
Dimension(H × W × D)	914(with wheels)×550×250 mm 35.98(with wheels)×21.65×9.84 inch
Net weight	150 kg (330.69 lbs)
Cell(s)	16S1P
Electrolyte	LiFePO4
Certifications	CE / CEC / SGIP / IEC 62619 / IEC 61000 / UN38.3 / SATS 5398 UL1973 / UL9540A / UL9540 pending
Warranty	10 Years

HEATER SPECIFICATIONS

Specification	Details
Rate Voltage	56 V
Power Consumption	1000 w
Function	self-heating starts ≤41°F(5°C), ≥59°F(15°C) self-heating stops

Frequently-Asked Questions

Can the RUiXU Lithi2-20 battery be expanded?

Yes. The Lithi2-20 supports up to 32 batteries connected in parallel, providing a maximum of 640kWh of nominal energy storage. Proper system sizing, wiring, and compatible equipment are required.

Is the RUiXU Lithi2-20 suitable for outdoor installation?

Yes. The battery features an IP55-rated enclosure suitable for protected outdoor installations. However, the manufacturer requires protection from prolonged direct sunlight and rain exposure. A shaded location or appropriate weatherproof shelter is recommended.

Does the Lithi2-20 have a built-in self-heating system?

Yes. The battery includes a 1,000W self-heating system designed to support charging in cold weather. According to the datasheet, heating starts at or below 5°C (41°F) and stops at or above 15°C (59°F).

Is the Lithi2-20 compatible with my solar inverter?

The Lithi2-20 supports CANbus and RS485 communication for integration with compatible solar inverters. The manufacturer provides protocol settings for selected models from EG4, Sol-Ark, Victron, Deye, Schneider, SMA, and other brands. Always verify the exact inverter model and communication requirements before installation.

What is the warranty and expected lifespan of the RUiXU Lithi2-20?

The Lithi2-20 includes a 10-year manufacturer warranty and has a 15-year design life. It is rated for 9,500+ cycles at 80% depth of discharge, with actual lifespan depending on operating conditions, temperature, and system usage.

Manual

Shipping & Easy Returns

Shipping is free across the Lower 48. No fuel surcharges, no residential fees, and no liftgate charge on freight orders. The price you see is the price you pay. Read our full Shipping Policy here.

Most orders leave the warehouse in 1 to 2 business days and arrive within 3 to 10 business days. We send tracking the moment it ships.

Anything that ships on a pallet goes freight with liftgate and pallet jack included, so the driver gets it off the truck and onto the ground at your address. The carrier will call you directly to schedule a delivery window.

Returns are 30 days from delivery. For freight deliveries, inspect the shipment before you sign for it. If something is damaged in transit, note it on the delivery receipt and we handle the freight claim, not you. Read more about our Returns Policy here.

Why Buy From Us

Buying solar online should not mean guessing your way through the install. Here’s what you get with Off-Grid Source.

We size the system, not just sell it. Call before you order and a sales engineer will check the kit against your actual loads, tell you if you’re buying too much or too little, and list the site-specific parts your install will need.
A+ rated by the Better Business Bureau. Another trust signal that you’re buying from a real company that stands behind the sale.
Free shipping across the Lower 48. No hidden freight charges, residential fees, or liftgate surprises at checkout.
Guaranteed best prices. Find the same product for less elsewhere and we’ll match it.
30-day easy returns. If it is not the right fit, we’ll help you get it sent back.
A real person on the phone. Product questions, sizing, install planning, warranty help: call us at +1 (877) 556-3347.

FAST & FREE SHIPPING

From US-Based Warehouse

30-DAYS EASY RETURNS

Yes, Really.

GUARANTEED BEST PRICES

Find a Better Price? We’ll Match It.

GREAT CUSTOMER SERVICE

Call Us: (+1) 877-556-3347

Our Customers Tell It Better Than We Do

Excellent 4.9/5

Trusted By 10,000+ Customers. See All Reviews.

They Stood By Me

I was a DIY solar power wannabe... that is 'til I connected with Manny... The man's a prince! He not only knows his stuff; he walked me through all things electrical. To make sure I had all I needed... he gave me his cell phone # to text him anytime I got confused... nights and weekends included. The prices were very competitive... definitely go with Manny -- you won't go wrong!

Bruce D.

Awesome Service!

I am always hesitant to buy things at places I have never shopped... I want to give a shout out to Manny who with great patience and knowledge helped me get my orders... I felt valued as a customer and I will definitely be back in the future. I highly recommend them, they make you feel like family.

Jennene A.

Real Person, Honest Service.

I'm about to go off grid. I called Manny, he walked me through everything so I could truly understand what I needed and never tried to upsell me. He was honest and made a customer for life.

Ray B.

Easy Return

I would personally like to thank Manny... I purchased the inverter and decided I needed to return it... Manny was very understanding and went out of his way to help me return the product and not even have to pay for shipping return. He gives this company reputation, honor and quality customer service!

Roger V.

Totally Off Grid.

I have been talking with Manny the owner... He has not only helped me design a system but he's been assisting with the install and components. I am super pleased so far with the assistance.

Jeff S.

Great Product! Fast Shipping

We added 2 more batteries to our current set up. Pleased with the customer service from Off-Grid Source! Will be back!

Jason

Excellent Customer Service

Very fast response times. Very professional. I highly recommend!

Ray W.