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Message: <blockquote data-quote="migaraDe" data-source="post: 27299263" data-attributes="member: 310238">Good calculation. Most people think UPS is a backup power system. The role of UPS is to provide uninterrupted power during failover to backup power and wise versa.Another aspect to consider is charging time, if planning to use daily.Recommended current for charging lead acid batteries is 2A (for longer battery life).In that case, to charge a 100Ah batter, it will take = 50 hours.If charged with 4A, time for charging = 25 hours.If planning to use for 9-10 hours. you'll need 2 x 100Ah batteries ( charging with 4A)Over discharge protector is essential if inverter does not have the feature or planning to use with DC-DC step up/down.</blockquote>

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