Weco lithium battery SL-5k3 LV/HV

• 5.3 kWh of lithium battery storage per module at 52V nominal
• Dual-voltage architecture — deployable in either low-voltage (LV) or high-voltage (HV) configurations
• 100% depth of discharge for maximum usable capacity
• 110 A continuous charge/discharge, 160 A for 60 seconds, 200 A peak for 5 seconds
• Massive expansion: HV up to 16 modules in series × 9 clusters; LV up to 100 modules in parallel with WE-HUB
• Cluster capacity up to 748 kWh (HV) / 520 kWh (LV)
• Expected cycle life of > 8,000 cycles at 25°C
• 15-year design life
• Wide operating temperature: charge -10 to 55°C, discharge -20 to 55°C
• RS485, CAN, RS232, and Wi-Fi communication
• Certified to IEC62619, UL1973, CE, and UN38.3

The SL-5k3 is engineered around Weco’s adaptive BMS and is designed to integrate cleanly with the full range of major hybrid inverters on the market.

• Multi-protocol communication: RS485, CAN, RS232, and Wi-Fi for flexible integration with hybrid inverters and external monitoring
• Adaptive BMS with real-time cell balancing and three-stage protection logic
• Self-adapting charge logic adjusts charge/discharge profile based on battery state
• Compatible with remote monitoring via Weco’s mobile app (Android / iOS)
• Single-string capacity of 16 modules simplifies large-system wiring
• Pre-charge and MOSFET protection guard against inrush current damage during commissioning

Whole-Home Residential Solar with Expansion Potential

The SL-5k3’s modular design lets homeowners start with a single module and scale over time. With LV architecture and a WE-HUB, up to 100 modules can run in parallel — 520 kWh of storage in a single cluster.

High-Voltage Systems for Larger Installations

HV configuration (16 modules in series, up to 9 clusters in parallel with an HV BOX) suits larger residential and light commercial installations where high-voltage battery architectures deliver efficiency and cabling benefits.

Off-Grid and Backup Power

200 A peak current and 110 A continuous charge/discharge support heavy intermittent loads — air conditioners, pumps, and power tools — in off-grid and backup applications.

Long-Life Professional Installations

With 8,000+ expected cycles and a 15-year design life, the SL-5k3 is built for installations where the battery is expected to outlast multiple inverter replacements.

Hot and Humid Climates

Wide operating temperature envelope (charge -10 to 55°C, discharge -20 to 55°C) with 5–95% humidity tolerance makes the SL-5k3 a strong fit for tropical and sub-tropical deployments.