**A 12v 100ah lead-acid battery with a 50% DoD limit will run an appliance that requires 3000W for about 10 minutes. But, it’s not recommended to discharge your 100ah lead-acid battery at this much higher rate, it can permanently damage your battery**

* The calculation is not that simple!* there are some

**“**Shortcomings

**”**Of All These Methods which I’ll explain at the end of this post

Use the calculator below to find out how long your 100ah battery will last on a 3000-watt appliance.

## 100ah Battery runtime Calculator

Note!use my solar panel size calculator to find out what size solar panel you need to recharge your battery in desired hours with solar panels.

### Assumptions:

**Inverter Efficiency:**90%**Lead-acid battery:**50% depth of discharge limit**Lithium (LiFePO4):**100% depth of discharge limit

**Battery Depth of discharge DoD:** is the percentage of the battery that has been discharged relative to the total battery capacity. The recommended depth of discharge limit for lead-acid, AGM, and gel batteries is about 50%. Only lithium (LiFePO4) batteries can be fully discharged to 100%.

### How To Use The Calculator

**Enter the battery capacity in amp-hours (Ah):**in this case, it’ll be 100**Enter the battery voltage:**is this a 12, 24, or 48-volt battery?**Select the battery type:**Select “Lead-acid” if you’re using a flooded or sealed (AGM or gel) lead acid battery. Select “Lithium (LiFePO4)” if you use a lithium-iron-phosphate battery.**load Connected with inverter?:**Are you using an inverter to run the load or is the load connected directly through the battery?**Enter total load in watts:**Enter the total load in watts (e.g 3000 for 3000 watts of output load)

After entering the information, click** “Calculate” **button to find out how long the battery last running a load.

### Example

## Video – Solar battery 101

## Steps To Calculate 100ah Battery Runtime On 3000-Watt Appliance

Follow these steps to calculate the 100ah battery life/runtime while running a 3000w load.

### Steps

**1- Converter battery ah into watt-hours (Wh)**. to calculate the battery capacity in watt-hours use this formula

**Battery capacity in watt-hours **= Battery amp-hours (Ah) * Battery Volts

let’s say you have a 12v 100ah battery

`100ah battery in watts = 100 * 12 = 1200 watt-hours `

**2- Multiply the battery watt-hours by the battery depth of discharge limit**. **( Default battery depth of discharge limit, Lead-acid battery: 50% DoD limit; Lithium: 100% DoD limit )**. Let’s say you have a lead-acid type battery

`Battery capacity in wh after DoD limit = 1200 * 50% = 3000wh`

**3- Multiply the battery capacity after the DoD limit with the inverter efficiency rate to calculate the AC watt-hours ( Most of the inverters are about 90% efficient)**

`Battery AC watts = 3000 * 90% = 540 AC watt-hours `

**4- Divide the battery AC watt-hours by the total load connected. **Let’s say 3000-watt appliance is connected to your 100ah battery

`100ah battery runtime on 3000w appliance = 540 / 3000 = 0.18 hours`

## How Long Will A 100ah Battery Run An Appliance That Requires 3000W

Here’s a chart on how long will a 100ah battery will last on a 3000-watt load.

Battery Capacity | Battery Type | 100ah Battery Runtime on 3000w |
---|---|---|

12v 100ah | Lead-acid | 0.9 hours |

24v 100ah | Lead-acid | 1.8 hour |

48v 100ah | Lead-acid | 3.6 hours |

12v 100ah | Lithium (LiFePO4) | 1.8 hour |

24v 100ah | Lithium (LiFePO4) | 3.6 hours |

48v 100ah | Lithium (LiFePO4) | 7.2 hours |

### Summary

- A 12v 100ah lithium battery will run an appliance that requires 3000W for about
**1.8 hours**

## 3 Steps To Extend Your Battery Lifetime

## Assumptions & Shortcomings Of All These Methods

Here are some extra yet essential points to keep in mind when figuring out how long your 100ah battery will last running a load

### Battery Life Cycle Count:

- The battery’s storage capacity will decrease with every cycle ( a cycle is when you charge and discharge the battery to its DoD limit ).
- if you have used your battery for a few hundred cycles then the result will be different. ( this factor isn’t included in my above-given methods )

### 100ah Lead-Acid Batteries Are Rated For 5 Amps Over 20 Hours Of Time:

- Especially lead-acid type batteries are designed to be discharged at 20 hours. ( means 100ah
**lead-acid batteries are recommended to be discharged @ 5 amps**in order to maintain the battery health and reduce the discharge efficiency ). - on the other hand,
**AGM and lithium (LiFePO4)**can be**discharged at 50% of their capacity**. - Discharging your battery at a higher rate will increase heat in the battery’s internal cells which will cause power loss. (this factor isn’t included in my above-given methods).
**For example**, if you discharge your lead-acid battery with 100 amps then it’s will not last 30 minutes ( keep in mind the 50% DoD limit ). but it may last about 15-20 minutes.- Check the battery discharge rate on the specs sheet of your battery or it’ll be mentioned on the battery
**(1h → 1C, 2h → 0.5C, 5h → 0.2C, etc.)**

## related Posts

- How Long Will A 100Ah Battery Last? + Calculator
- How Long To Charge 100Ah Battery? + Calculator & Charts
- How Long Will A 100Ah Battery Run A Tv? (+ Calculator)
- How Long Will A 100ah Battery Run A Fridge?

## Resources

- How Long Does A Battery Last? – Learnmatrics.com
- How To Calculate Battery Run Time