Villa Energy Storage System Configuration Plan: 25kW Power, 100kWh Battery & 30kW Solar PV

Project Overview

• Achieve high renewable energy penetration

• Stabilize power supply during grid outages

• Lower long-term energy expenses through peak-valley arbitrage

• Enhance environmental sustainability

Core Equipment Selection

1. Battery System

• Type: Lithium iron phosphate (LFP) batteries

• Exceptional safety (fire-resistant, non-toxic)

• Long cycle life (6,000–8,000 cycles @ 80% DOD)

• High energy efficiency (95%+ charge/discharge efficiency)

• Low maintenance and eco-friendly

• Advantages:

• Configuration:

• 5x 20kWh LFP battery modules (parallel connection) to reach 100kWh total capacity

• Recommended Brands: CATL, BYD

2. Inverter System

• Type: 30kW bidirectional hybrid inverter

• Supports both grid-tied and off-grid operation

• MPPT (Maximum Power Point Tracking) for 98%+ PV efficiency

• Built-in protections: islanding, overvoltage, undervoltage, overcurrent

• Compatible with smart energy management systems (EMS)

• Key Features:

• Functionality:

• Converts DC power from PV/batteries to AC for villa use

• Manages bidirectional energy flow (grid ↔ batteries ↔ loads)

• Recommended Brands: GoodWe, Ginlong Technologies

3. Solar PV Modules

• Type: 500W monocrystalline silicon PV panels

• High conversion efficiency (23%+) for maximum energy harvest

• Durable design (25-year power output warranty)

• Low light performance for consistent energy production

• Advantages:

• Configuration:

• 60x 500W panels (total 30kW) installed at optimal tilt angle (local latitude ±10°)

• Recommended Brands: LONGi, JinkoSolar

4. Battery Management System (BMS)

• Core Functions:

• Real-time monitoring of voltage, current, temperature, SOC (State of Charge), and SOH (State of Health)

• Prevents overcharge/overdischarge, balances cell voltages, and extends battery life

• Communicates with inverter/EMS via RS485/CAN protocols

• Key Specifications:

• Support for parallel battery configurations

• Fault detection and early warning capabilities

5. Energy Management System (EMS)

• Intelligent Control:

• Daytime: Prioritizes PV power for loads; excess charges batteries

• Night/Peak Hours: Draws power from batteries or grid (if needed)

• Backup Mode: Switches to battery power during outages within 10ms

• Optimizes energy flow based on PV generation, load demand, and battery SOC:

• Monitoring Features:

• Real-time data dashboard (PV output, ESS status, energy consumption)

• Remote access via mobile app/web portal for system control and analytics

System Integration & Installation

Electrical Design

• PV Array: Series-parallel connection to match inverter input voltage (DC 300–800V)

• Battery Bank: Parallel connection of 5x 20kWh modules (48V DC system)

• Wiring: Use fire-resistant cables and surge protectors for safety

Installation Guidelines

• Battery Location: Ventilated, dry area (e.g., garage) with thermal insulation

• Inverter Placement: Close to the main electrical panel for easy access

• PV Mounting: Secure racking system with anti-wind (≥120km/h) and anti-rain features

• Grounding: Comprehensive lightning protection and grounding system

Monitoring & Maintenance

Real-Time Management

• EMS Platform: Track key metrics (e.g., daily PV yield, battery cycles, cost savings)

• Alerts: Receive notifications for system faults, low battery levels, or maintenance needs

Maintenance Plan

• Quarterly: Clean PV panels, inspect wiring connections, and update BMS firmware

• Annual: Test battery health (SOH), calibrate SOC, and review system performance reports

Expected Performance

• Energy Self-Sufficiency: Achieve 70–85% daily energy independence (depending on sunlight)

• Cost Savings: Reduce grid electricity consumption by 50–70%, payback period 5–8 years

• Reliability: Uninterrupted power during outages, supported by 100kWh backup storage

Conclusion