Cute LIT 220W Inverter Load Test ⚡ Auto Changeover IPS System Explained! 🔋 Real Load Backup Test
Cute LIT 220W Inverter Load Test ⚡ Auto Changeover IPS System Explained! 🔋 Real Load Backup Test
Are you looking for a reliable backup power solution for your WiFi router, CCTV, or small appliances? In this detailed post, we’ll explore how to test a Cute LIT 220W inverter with an Auto Load/Off Changeover Circuit, ensuring smooth and automatic power backup with zero downtime.
This guide is powered by a real schematic (see image below) that was tested with actual loads like LED bulbs, routers, and small fans to measure performance and battery efficiency.
✅ What You’ll Learn:
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How to build and test a 220W inverter system
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Working principle of auto-changeover IPS circuits
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Circuit diagram analysis
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Real load testing & performance results
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LED power indicators & backup time estimation
📷 Circuit Diagram:
Below is the schematic diagram used for the test. Designed using EasyEDA:
$5 10pcs 1-2 layer PCB Order from PCBWay: https://www.pcbway.com/?from=technology4power
⚙️ Circuit Diagram Explanation:
This circuit is a Mini DC IPS Auto Load/Off Changeover System, designed to switch between the main DC input and a 12V battery when the main power fails.
🧩 Key Sections:
🔌 Input Power Section:
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Power Socket (IN): Receives 12V DC from an adapter or solar system.
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PWR1 + LED2: A 1K resistor with a red LED (LED2) indicates when input power is present.
⚡ Relay Section:
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Relay (SRD-05VDC-SL-C): A 5V coil relay used to switch between power sources.
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Relay Pins:
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Pin 2 & 5: Connected to DC input (activates coil)
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Pin 3 (COM): Connected to load output
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Pin 4: Ground
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D1 (1N4007): Flyback diode across the relay coil to prevent voltage spikes.
🔋 Battery Section:
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BAT Connector: Connected to a 12V DC lead-acid or Li-ion battery.
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When the relay is not energized (power off), the load connects to the battery via NC (Normally Closed) pin.
🔁 Auto Load Switch Logic:
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NO Connector: Connected to DC input — powers the load when relay is ON.
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NC Connector: Connected to battery — powers the load when relay is OFF.
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NC1/NO1 + LEDs: Status LEDs to indicate which source is currently supplying power.
🔦 LED Indicators:
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NC1 + NC2: Red LEDs indicate when load is running on the battery.
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NO1 + NO2: Red LEDs indicate when load is running on the main power.
🔧 Circuit Components (as per schematic):
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Relay: SRD-05VDC-SL-C
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Diodes: 1N4007, 6A10
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Resistors: 1K Ohm (x3)
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LEDs: 5mm Red (x3)
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Power Socket: DC input
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Battery Connector: 12V DC (Typical)
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NC/NO Terminals: Output connections
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GND: Common ground line
🧠 How It Works:
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When AC mains (via adapter) is ON, the relay activates and powers the load directly.
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When mains fail, the relay deactivates, switching the load to the battery.
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The LED indicators show active power source.
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Diodes protect the relay and ensure reverse current protection.
📷 Schematic Overview:
Below is the tested circuit diagram for the mini auto-load/off IPS system used in this test:
🔍 Real Load Test with Cute LIT 220W Inverter:
We tested the system with:
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💡 12V 10W LED Bulb
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🌐 WiFi Router (5V via buck converter)
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🌀 Mini DC Fan
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🔌 USB mobile charger
Total load: ~45W
Backup Time: 2.5+ hours on a 12V 7.5Ah Battery
YouTube Video:
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📊 Final Thoughts:
If you want a low-cost DIY UPS or IPS system, this auto changeover circuit is a must-have. It ensures your devices stay online without manual switching. Combined with the Cute LIT 220W inverter, this becomes a powerful mini-IPS system that you can rely on during power cuts.
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