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Message: <blockquote data-quote="maxtalker" data-source="post: 27296734" data-attributes="member: 52708">I don't think UPS will do the trick. However you can do as bellowFirst let's count WattageLap : let's say 100WRouter: 20Wso your total wattage be = 120WYou need a 9 hours of power =  120W*9H = 1080WHNow let's count the battery capacity you need. remember if you use car batteries you can only use 50%, if you use deep cycle you can use 80%. Let's assume you are going to use deep cycle batteries.So actual WH need is = 1080 + (1080/100*20) = 1296WHBattery Amh Hours (12V batteries) =  1296/12 = 108AmhYou need a 100Ah battery at least.Things you'll need1) An inverter which can use above battery size.2) Battery charger (if inverter don't have one)3) DC breaker ,(in between inverter and batteries) and some wires.This is a rough idea, please use a professional if you aren't familiar with these stuff.Follow DIY offgrid Sri Lanka Facebook group as well.</blockquote>

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