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【Yiteng Case Sharing 9】Practical Analysis of the Injection Molding Factory's Storage Project in Dongguan
创建于05.26
Dongguan Injection Molding Factory Supporting Project Practical Analysis
——Guide to the Full Process of Investment and Development in Industrial and Commercial Energy Storage + Golden Algorithm for Matching Storage Capacity
1. Project Background: Pain Points of Electricity Usage in the Injection Molding Industry
Electricity cost proportion is high: Electricity costs account for 18%-25% of production costs (industry average 12%)
Peak-valley price difference is large: The peak-valley electricity price difference in Dongguan reaches ¥0.92/kWh (peak electricity ¥1.2/kWh vs valley electricity ¥0.28/kWh)
Capacity fine: Monthly average fine for transformer capacity overload ¥36,000
2. Solution: Integrated Photovoltaic Storage + Intelligent Scheduling
🔹System Configuration Plan:
Device | Parameter | Function positioning |
Rooftop Photovoltaics | 1.2MWp | Daily power generation 5000kWh (30% self-use) |
Energy Storage System | 2MWh lithium iron phosphate | Two recharge and two release arbitrage |
Energy Management System | Huawei FusionSolar | Automatic switch to optimal power consumption mode |
🔹Typical Daily Scheduling Strategy:
3. Capacity Calculation Golden Formula
🔹Four-Step Calculation Method
1. Basic Load Analysis:
Injection molding machine peak power 800kW, continuous operation 16 hours/day
2. Price spread arbitrage space:
Transferable load = Peak load × 30% = 240kW
3. Energy storage capacity calculation:
Demand Capacity = Transferable Load × Discharge Duration = 240kW × 4h = 960kWh
Actual configuration 2MWh (reserved expansion space)
4. Economic Verification:
Daily income = (¥0.92 price difference × 960kWh) + cost-saving ¥1200 = ¥2003
4. Investment Return Model
Project | Value | Calculation logic |
Total Investment | ¥5.8 million | Energy storage ¥3.5 million + Photovoltaic ¥2.3 million |
Annual Income | ¥1.02 million | Electricity cost savings ¥780,000 + subsidy ¥240,000 |
Payback Period | 5.7 years | After-tax IRR 14.3% |
Carbon Emission Reduction | 1200 tons CO₂/year | Equivalent to the carbon fixation of 70 acres of forest |
5. Policy Dividend Exploration
Dongguan Special Support
Energy storage discharge subsidy ¥0.3/kWh (continuous subsidy for 3 years)
Photovoltaic electricity subsidy ¥0.1 (valid before 2025)
Transformer capacity expansion fee reduced by 50%
6. Risk Control Three Pronged Approach
Electricity price fluctuations: Sign a peak-valley price difference guarantee agreement with the electricity sales company
Battery degradation: Purchase CATL's specialized energy storage cells for 10,000 cycles
Policy withdrawal: Design a rigid five-year return model
💡
Summary
"When peers are still complaining about electricity costs, this injection molding factory has turned the power distribution room into a money printing machine—earning ¥2000 in electricity cost differences every day as soon as they open their eyes."
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