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Here's a chart showing how long a 12v 50Ah lead-acid battery will run a fan. Related Post: Solar DC Watts To AC Watts Calculator How Long Will A 12 Volt Car or Deep Cycle Battery Run A Fan? Chart Advertisements You would get 510 AC watts from a 12v 100Ah lead-acid battery with a 50% depth of discharge limit. 600 * 0.85 (for 85% inverter efficiency) = 510 AC watts

Let's continue with the previous example. So if you're running an AC or DC fan with an inverter with a 12v battery then minimize the DC to AC conversion loss from battery watt-hour capacity. When converting DC into AC there will be some power loss because usually, inverters are only 85-90% efficient.Īdvertisements This means a 100W inverter will consume 100W DC power from the battery bank and only will be able to output 85-90 AC watts. But some small fans required DC current (12v) which you can run directly from a 12v battery. Related Post: Amps To Watts Calculator: How Many Watts In A 12-volt Battery? Inverter Efficiency AdvertisementsĪn inverter will be required to run an AC fan (which consumes 120-220V input). This guy has explained wonderfully about batteries. You have 600 Wh of useable power stored in a 12v 100Ah lead-acid battery. To calculate the useable Wh multiply the value by 2 for lead-acid, AGM, and gel battery types (Because of their 50% depth of discharge limit). Let's suppose you have a 12v 100Ah lead-acid battery. Now let's get into some calculation stuff.Īdvertisements First, let's calculate the battery capacity in watts from amp-hours (because the fan's capacity is measured in watts).īattery capacity in Watt-hours = Battery Ah * Battery Volts For Example This was just a basic overview of batteries if you're a noob. But the lithium (LiFePO4) batteries can be fully discharged up to 100%. Which means you can only discharge them half. Lead-acid, and AGM batteries have a DoD (depth of discharge) limit of 50%.

There are mainly 3 types of batteries, lead-acid, AGM, and lithium. Now let's dive deep into some calculation stuff so again you'd never have to use any calculator to figure out the backup time of your battery.