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In this video, I added a module to protect the battery and did the final modifications. All devices that were used in the video were purchased with personal funds during sales and using promo codes, so the prices on the site may not match. At the moment, ALL modules and components in this assembly, at Aliexpress prices, without discounts and promo codes, are about $ 110. I bought it all with promo codes and in total it all came out to about $ 82. GEYA GRT8-EC 10A Dual function Timer Relay on Delay or off Delay Relay AC220V/DC24V AC380V Time Relay CE CB ROHS https://www.aliexpress.com/item/10050... GEYA Din Rail Mounted Household Modular AC Contactor for Smart Home House Hotel AC220V https://www.aliexpress.com/item/10050... TOMZN Din Rail 2P 3P 4P ATS Dual Power Automatic Transfer Switch Electrical Selector Switches Uninterrupted Power 63A 100A TOMZN Mini https://www.aliexpress.com/item/40009... Car Battery Charger 12V 6A Pulse Repair LCD Display Smart Fast Charge AGM Deep Cycle GEL Lead-Acid Charger For Auto Motorcycle https://www.aliexpress.com/item/10050... Houli Inverter for 110v 12v 220v 4000w Inverter 12v 220v Pure Sinus Solar Inverter 12v Inverter 12v 220v Clean Sinys https://www.aliexpress.com/item/10050... XH-M609 DC 12V-36V Charger Module Voltage OverDischarge Battery Protection Precise Undervoltage Protection Module Board https://www.aliexpress.com/item/10050... 1PCS 12V low level trigger One 1 Channel Relay Module interface Board Shield For PIC AVR DSP ARM MCU Arduino https://www.aliexpress.com/item/10050... Subscribe to channel: / @uw5epe sub_confirmation=1 I recommend watching: Connecting AVR addition ????time relay and contactor???? • Connecting AVR addition ????relay time... #avr #ups #invertor #blackout