# How do you calculate how long a battery will last on an inverter?

**To determine how long**your

**battery will last**,

**calculate**the

**battery's**total capacity and divide it by your circuit's power. Multiply the

**battery's**reserve capacity by 60. With a reserve capacity, for instance, of 120: 120 x 60 = 7,200.

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Considering this, how long will a battery last with an inverter?

30 to 60 minutes

Furthermore, how long will a 80ah battery last? This means that a battery has a 100 A.H. capacity if it is discharged over **20 hours**, or at about 5 Amps-per-hour (100 A.H. / **20 hours** = 5 Amps DC). However, this same battery would last only one hour if the discharge rate was 50 Amps-per-hour (50 Amps DC x 1 hour = 50 A.H.) because of the high rate of discharge.

Furthermore, how long will a 12 volt battery last with an inverter?

You load is consuming a courant which is 65w/ **12v**= 5.42A. The time the **battery will long** is 100 Ah/ 5,42= 18,45 hours. But the **inverter** is not 100% efficient so let's say 17 hours approximately.

How long will a 120ah battery last?

Watts / Volts = Amps per hour Therefore a 100ah (amp hour) **battery will last** for 1000 hours.