Solar UPS controller/automatic transfer switch

Summary of Solar UPS controller/automatic transfer switch


This project, "UNplug," is a solar-powered microgrid system designed to run essential household appliances like refrigerators and modems off-grid. It features a modular and scalable design supporting up to 1500W continuous power, integrating solar panels, batteries, charge controllers, and inverters. The system evolved from using a Particle Spark Core to an Arduino MKR1000 for better control and reliability. The latest version includes heavy-duty relays, a PWM solar charge controller, and an external power supply, all housed in a portable toolbox-sized metal case delivering clean sine wave output. It supports IoT features for monitoring via WiFi.

Parts used in the UNplug project:

  • Particle Spark Core
  • Arduino Nano R3
  • Arduino MKR1000
  • 1500W pure sine wave inverter
  • Sealed lead acid or lithium batteries (0.8 - 1.2 kWh capacity)
  • H4 solar connectors
  • 30A, 120/240VAC heavy duty relay
  • External 40W switching power supply
  • 50A, 32V solar PWM charge controller
  • 24V DC power supply (max 20W)
  • Buzzer
  • Temperature sensor
  • 120V to 24V transformer
  • Heavy duty 6 AWG terminals
  • 120V DPDT relay
  • Power MOSFET bank (up to 50A at 30VDC)
  • Terminals for 10A at 120VAC
  • Polycase standard enclosure

Get your essential appliances off the grid with just one solar panel

Things used in this project

Story

Custom parts and enclosures

 

Source : Solar UPS controller/automatic transfer switch


About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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