Why Choose the ESP-BU20?
The ESP-BU20 is a scalable and flexible energy storage solution that supports up to four battery packs, making it suitable for households of any size. Designed with advanced safety features, it includes a Battery Management System (BMS) to monitor and safeguard performance, along with pending certifications such as UL9540, UL1973, CEC, and SGIP to ensure compliance with industry safety standards. Additionally, it offers environmental and cost benefits by supporting sustainable energy use when paired with renewable sources and reducing electricity bills through off-peak energy storage for use during peak demand.Â
Key Features

Scalable and Flexible Storage
Supports up to four battery packs

Advanced Safety Features Battery Management System (BMS)
UL9540, UL1973, CEC, SGIP compliant

Eco-Friendly Energy Storage
Supports sustainable energy use

Cost Efficiency
Energy stored to use during peak demand.
Downloads
Download the detailed data sheet and comprehensive installation manual for complete product specifications and step-by-step setup guidance.
Perfect for Renewable Energy Systems
Whether used as a backup system or integrated with solar panels, the ESP-BU20 provides an optimal solution:Â
- Grid Backup Power: Reliable energy during power outages.Â
- Solar Integration: Store excess energy generated by solar panels and use it when needed.Â
- Energy Load Management: Reduce reliance on grid power during peak demand times.Â
Key Features and Benefits
Unparalleled Energy Capacity
The ESP-BU20 is designed to meet diverse energy demands with its scalable configurations:Â
- Single Battery Capacity: 5.12 kWhÂ
- Dual Battery Capacity: 10.24 kWhÂ
- Triple Battery Capacity: 15.36 kWhÂ
- Quad Battery Capacity: 20.48 kWhÂ
- Working Voltage Range: 48V – 56VÂ
With this flexibility, it’s perfect for small to large households seeking reliable energy storage.Â
Built to Endure
- Lifecycle: Up to 6,000 cycles for long-lasting performanceÂ
- Warranty: Comprehensive 10-year coverageÂ
- Battery Management System (BMS): Advanced technology for optimal performance and safety, including protection against overcharging and overheating.Â
Rugged and Compact Design
- Material: Powder-coated steel for durabilityÂ
- Dimensions: 48.2 x 22.9 x 14.1 inches (1224.3 x 581.7 x 358.1 mm)Â
- Weight (Enclosure): 130 lbs (59 kg)Â
- Protection Rating: IP55 for resistance against dust and waterÂ
This sleek and robust unit fits seamlessly into indoor and outdoor environments, ensuring versatility in placement.Â
Industry-Leading Efficiency
The ESP-BU20 achieves high efficiency with its advanced technology:Â
- Round-Trip Efficiency: 97%Â
- Optimized Performance: Ensures minimal energy loss during charging and discharging, maximizing energy savings.Â
Warranty and Support
Specifications at a Glance
Feature | Detail |
Maximum Capacity | Up to 20.48 kWh |
Battery Packs Supported | 4 ESP-5100 or ESP-5K HL |
Working Voltage | 48V – 56V |
Enclosure Weight | 130 lbs (59 kg) |
Dimensions | 48.2 x 22.9 x 14.1 inches |
Protection Level | IP55 |
Certifications | UL9540, UL1973, CEC, SGIP (pending) |
Applications
The ESP-BU20 is suitable for a variety of residential needs:Â
- Backup Power: Ensures continuous power during outages.Â
- Renewable Energy Storage: Ideal for solar and wind energy systems.Â
- Off-Grid Living: Supports complete energy independence for remote homes.Â
Power Your Future with the ESP-5K HL
The ESP-BU20 Residential Storage Unit by EndurEnergy Systems offers unmatched energy storage capabilities for modern households. Supporting up to 20.48 kWh of storage, this system is engineered for reliability, efficiency, and scalability, making it an ideal choice for residential energy independence.Â
FAQ’s
Can I expand the system later?
Yes, the ESP-BU20 allows scalability from one battery pack to four, accommodating growing energy needs.Â
How long will the system last?
The ESP-BU20 offers up to 6,000 cycles, equating to over 10 years of reliable use with proper maintenance.Â
Is it suitable for outdoor installation?
Yes, with an IP55 protection rating, the unit is resistant to dust and water, making it ideal for indoor and outdoor use.Â