Residential Off-Grid solar storage systems project with 11kW inverter 20kWh battery - case study

Empowering Households with Clean, Independent Energy – A MOTOMA Solar Storage Project

Facing unreliable grid electricity and rising energy costs, a private homeowner turned to MOTOMA for a sustainable and self-sufficient power solution. The result is a compact yet high-performance residential energy system that ensures day and night energy availability with zero grid reliance.

Project Overview

• 1 × 11kW off-grid inverter (Axpert MAX TWIN series)
• 2 × 10kWh lithium iron phosphate (LiFePO₄) battery packs
• Estimated 6–8 × 550W solar panels
• Total inverter power: 11kW
• Total battery capacity: 20kWh (approx. 16kWh usable at 80% DoD)

Technical Details

Inverter Features

• 150A MPPT solar charge controller
• Dual AC output for smart load separation
• Mobile monitoring via built-in Wi-Fi
• Wide PV input voltage (90–450VDC)
• Customizable LED status bar with RGB indication
• Battery-independent design with full off-grid capability
• Supports generator or grid input as backup

Battery Performance

• Battery type: MOTOMA LiFePO₄
• Capacity per unit: 10kWh, 51.2V
• Cycle life: >6000 cycles @80% DOD
• Integrated intelligent BMS (CAN/RS485/RS232)
• Compact, long life, and low maintenance
• Total usable energy: approx. 16kWh

System Functionality and Load Support

• Typical Loads: 1.5HP air conditioner, refrigerator, 10–15 LED lights, TV, router, laptop, washing machine, kitchen appliances
• Runtime Example: At 3–4kW average load, batteries last 4–6 hours at night
• Solar Estimation: 3.3kWp system (6 × 550W), generating ~17–19kWh/day with 5.5kWh/m²/day solar irradiance

Installation Summary

1. Mount inverter indoors with proper airflow
2. Install 2 batteries in parallel and ground securely
3. Wire solar panels in series with proper protection
4. Configure AC outputs for essential/non-essential loads
5. Commission the system via LCD/app and test safety functions

Safety and Maintenance Tips

• Ensure ventilation and spacing around equipment
• All terminals and wires must be insulated and grounded
• Inspect every 3–6 months
• Use mobile app or LCD for monitoring

Why MOTOMA?

This residential installation showcases MOTOMA’s ability to deliver reliable, modular, and scalable solar storage solutions tailored to household needs. Whether for energy security, cost reduction, or sustainability, MOTOMA’s technology empowers homes to operate independently of the grid — cleanly, quietly, and confidently.