5KW 25KWh Off-Grid Solar Energy Storage System Complete Kit

PowerWhale A25 25KWh Solar system

PowerWhale A25 Off Grid Home Solar Power system

This complete off-grid solar energy storage system is designed for households and remote locations that require a stable and independent power supply. It includes a high-efficiency 5KW inverter and a robust 25KWh lithium battery, offering a reliable and long-lasting energy solution without relying on the utility grid.

Ideal for areas with unstable or no grid access, the system stores solar energy generated during the day and powers your home during the night or in low-sunlight conditions. With smart energy management and built-in safety protections, it ensures seamless operation of essential appliances and electronics.

Compact, efficient, and easy to install, this all-in-one kit is perfect for cabins, rural homes, or off-grid setups looking to reduce fuel dependence and switch to clean, renewable energy.

Easy to install and move

Outstanding battery performance and durability

Modular battery design for easy expansion

Continuous power supply with automatic switching

Pure sine wave output, equipment-friendly

5kWh-10kWh Household stackable LiFePO4 battery series

5.5KW / 25.6kWh Home Solar System

Product Performance & Advantages

The 5.5KW 25.6KWh Off-Grid Solar Energy Storage System Complete Kit delivers outstanding performance for homes and facilities without access to the utility grid. With a powerful 5KW pure sine wave inverter and a high-capacity 25.6KWh lithium iron phosphate (LiFePO4) battery, the system provides a stable, high-efficiency energy supply capable of powering multiple household appliances, lights, and electronics simultaneously.

Built with a smart Battery Management System (BMS), the system offers reliable protection against overcharge, over-discharge, overcurrent, and overheating. The large battery capacity ensures extended backup time—ideal for multi-day use in remote areas or during long outages. The inverter supports various load types and ensures clean, consistent AC output to protect sensitive electronics.

Key Advantages:

  • Large Energy Storage: 25.6KWh battery provides long-duration power supply for high-demand off-grid applications

  • Stable Off-Grid Operation: 5.5KW inverter supports simultaneous running of appliances like refrigerators, fans, lights, and pumps

  • Smart Safety System: Built-in BMS with advanced protections for enhanced battery life and user safety

  • High Efficiency: Optimized energy conversion and minimal energy loss during storage and discharge

  • Scalable & Easy Setup: Modular design allows future expansion and straightforward installation

  • Green Energy Solution: Enables complete independence from diesel generators or unstable grids, promoting clean, renewable living

Whether for rural homes, farmhouses, cabins, or backup in grid-challenged regions, this system offers reliable, sustainable power around the clock.

5kWh-10kWh Home Storage system
5kWh-10kWh Solar Power System

PowerWhale A20 5.5KW / 25.6kWh Home Solar Power System

ModelPowerWhale A25
Rated Voltage51.2V
Working Voltage Range42-58.4V
Charging Voltage58.4V
Rated Capacity500AH
Energy25.6KWH
Rated Charging Current100A
Peak Charging Current100A
Rated Discharging Current100A
Peak Discharging Current150A
Charging Temperature0℃~15
Discharging Temperature-10℃~55
Optimum Operating Temperature15℃~25
Cooling MethodNatural Cooling
Relative Humidity5℃~95
Altitude≤2000M
Cycle Life≥4000 @800DOD,0.5C/0.5C, 25
Communication InterfacesCAN/RS485/RS232
ProtectionOver-temperature, over-current and over-voltage protection
Design Lifetime≥10 years
Dimension L*W*H600*450*1217
Weight275KG
Battery typeLiFePO4
ESS hybrid inverter 
Inverting mode 
Output Voltage WaveformPure sine wave
Rated Output Power (VA)6000
Rated Output Power (W)5000
Rated Output Voltage (Vac)220/230Vac
Output Voltage Error±5%
Output Frequency Range (Hz)50/60HZ
AC charge 
Charging Voltage Range40-60Vdc
Charging Current Error±5Adc
Maximum Charging Current60A
Solar charge 
Maximum PV Open-Circuit Voltage500Vdc
PV Operating Voltage Range120-500Vdc
MPPT Voltage Range120-500Vdc
Battery Voltage Range40-60Vdc
Maximum Output Power5000W
Noise Emission (dB)<35
Operating Temperature Range-15℃~55
Storage Temperature Range25℃~55

Why choose BESTWE as your preferred supplier to enter the clean energy industry?

BESTWE wholesaler support policy
We provide the following services to each of BESTWE’s wholesaler customers:

Improve customers’ local sales performance:
1. Provide local small distributor information for free.
2. Provide a large amount of local terminal buyer purchasing information for free;

Improve customer local visibility:
1. Provide free promotional materials according to customer needs, such as: roll-up banners, posters, banners, flyers, and brochures.
2. Assist customers to customize uniform clothing and large customer brand parasols.
3. Invite customers to participate in local large-scale industry exhibitions.

When you need to purchase in bulk or customize products in bulk, you can apply for free samples and free product customization services from us.

You only need to pay the upfront sample customization fee. When you confirm the product and place the order, we will fully refund all the upfront sample fee/customization fee.

1. On-site survey and demand analysis: Send a professional team to the African customer location to conduct on-site surveys to understand the customer’s electricity needs, local climate conditions and electricity usage habits in order to tailor suitable solar solutions.

2. Customer education and training: Introduce the working principle, advantages and scope of application of solar energy systems to customers, help customers understand the potential value of solar energy systems, and provide training on system use and maintenance.

3. Solution design and customization: Tailor-made solar system solutions for customers based on their actual needs and on-site conditions, including component selection, layout design, battery capacity planning, etc.

4. Technical support and consultation: Provide customers with technical consultation and support on solar energy systems, answer customer questions, and ensure that customers have a clear understanding of solar energy systems.

5. Product display and demonstration: Show the company’s products and solutions to customers, and help customers better understand product performance and application scenarios through technical demonstrations and case sharing.

6. Partnership establishment: Establish contact with local partners, government departments or NGOs to jointly explore cooperation opportunities and promote the development of the local solar market.

1. Product selection and customization: Based on customer needs and project requirements, we provide suitable off-grid solar product selections, including solar panels, inverters, batteries, etc., to meet customers’ specific needs.

2. Technical support and consultation: Provide technical consultation and support, answer customers’ questions about off-grid solar systems, and help customers understand technical specifications, performance parameters, and system design requirements.

3. Order processing and confirmation: Assist customers to complete the order processing process, including confirming product specifications, quantity, price, delivery method, etc., and ensuring the accuracy and completeness of order information.

4. Logistics and transportation arrangements: Cooperate with logistics partners to arrange the transportation and distribution of products to ensure that products arrive at the destination designated by the customer on time.

5. Payment and settlement: Provide flexible payment methods, accept wire transfer, credit card and other payment methods according to customer requirements, and ensure the security and transparency of the payment and settlement process.

1. Installation guidance: Provide remote or on-site installation guidance to help customers install off-grid solar systems correctly and ensure that the system can operate normally.

2. Equipment maintenance and troubleshooting: During the operation of the system, if the customer encounters equipment failure or other problems, we will provide technical support and maintenance services to solve the problem as soon as possible and restore the normal operation of the system.

3. Remote monitoring and maintenance: Through the remote monitoring system, we can monitor the performance of the customer’s off-grid solar system in real time, discover and solve potential problems in a timely manner, and ensure the stable operation of the system.

4. After-sales training: Provide customers with training on the use, maintenance and management of off-grid solar systems to help customers better understand the key points of system operation and maintenance.

5. Parts supply: If customers need to replace parts of the off-grid solar system or increase system capacity, we will provide corresponding parts supply and technical support.

6. After-sales consultation and support: Provide customers with after-sales consultation and support services, answer their questions about system operation, maintenance and upgrades, and ensure that customers have a clear understanding of off-grid solar systems.

In order to enhance our market competitiveness, BESTWE offers all products at a price 10% to 20% lower compared to our competitors while maintaining the same configuration and quality. We firmly believe that by providing cost-effective solutions, our customers will gain a stronger foothold in the market, fostering mutual growth and development between both parties.

Note: We are a manufacturer of prepaid household solar inverter storage systems, household solar system components, and solar-powered home appliances. We also offer a proven PAYGo (pay‑as‑you‑go) platform that can be white‑labeled and deployed under your own brand. At this time, we only accept OEM/ODM and wholesale orders — we do not sell retail. (Unless you have other purchases in China that can be combined into one shipment, the international freight costs may be prohibitive for small orders.)

Contact us for the most cost-effective factory wholesale prices and dealer support policies


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