Pairing a right size capacity battery for an inverter can be a bit confusing for most the beginners
So I have made it easy for you, use the calculator below to calculate the battery size for 200 watt, 300 watt, 500 watt, 1000 watt, 2000 watt, 3000 watt, 5000-watt inverter
Inverter Battery Size Calculator
Note! The battery size will be based on running your inverter at its full capacity
Assumptions
- Modified sine wave inverter efficiency: 85%
- Pure sine wave inverter efficiency: 90%
- Lithium Battery: 100% Depth of discharge limit
- lead-acid Battery: 50% Depth of discharge limit
Instructions!
- Inverter runtime: is the total number of hours you would need to run your load on an inverter
- Inverter input Volts (V): Are you using a 12v, 24v, or 48v solar system?
- Select a battery type: Select the type of battery you would like to use (Lea-acid, AGM, or Lithium)
๐๐ฆ๐ฉ๐จ๐ซ๐ญ๐๐ง๐ญ ๐๐จ๐ญ๐! If you're not running your inverter at its full capacity, For Example, let's say you have a 1000W inverter but your daily total load at a time doesn't exceed 600 AC watts so instead of entering 1000 in the inverter size box you can enter 600 which will give a battery size according to your load
To recharge your battery from time to time you would need the right size solar panel to do the job! Read the below article to find out the suitable solar panel size for your battery bank
Related Post: Solar Panel Calculator For Battery
How To Calculate Battery Capacity For Inverter
To calculate the battery capacity for your inverter use this formula
Inverter capacity (W)*Runtime (hrs)/solar system voltage = Battery Size*1.15
Multiply the result by 2 for lead-acid type battery, for lithium battery type it would stay the same
Example
Let's suppose you have a 3000-watt inverter with an 85% efficiency rate and your daily runtime is about 5 hours using a 24v solar system
3000*5/24 = 625
Now to cover watt losses when converting DC to AC
625*1.15 (85% inverter efficiency) = 718Ah
How many batteries for 3000-watt inverter
You would need around 24v 150Ah Lithium or 24v 300Ah Lead-acid Battery to run a 3000-watt inverter for 1 hour at its full capacity
Battery Size Chart For Inverter
Here's a battery size chart for any size inverter with 1 hour of load runtime
| Inverter Size | How Many 100Ah (Lithium) Batteries to run for 1 hour (100% DoD Limit) | How Many 100Ah (Lead-acid) Batteries to run for 1 hour (50% DoD Limit) |
|---|---|---|
| 12v 200 watt | 0.2 | 0.4 |
| 12v 300 watt | 0.3 | 0.6 |
| 12v 500 watt | 0.5 | 1.0 |
| 12v 600 watt | 0.5 | 1.1 |
| 12v 1000 watt | 0.9 | 1.8 |
| 24v 1000 watt | 0.4 | 0.9 |
| 12v 1500 watt | 1.3 | 2.6 |
| 24v 1500 watt | 0.7 | 1.4 |
| 12v 2000 watt | 1.8 | 3.6 |
| 24v 2000 watt | 0.9 | 1.8 |
| 24v 3000 watt | 1.3 | 2.6 |
| 48v 3000 watt | 0.7 | 1.4 |
| 24v 4000 watt | 1.8 | 3.6 |
| 48v 4000 watt | 0.9 | 1.8 |
| 24v 5000 watt | 2.2 | 4.4 |
| 48v 5000 watt | 1.1 | 2.2 |
| 24v 6000 watt | 2.7 | 5.5 |
| 48v 6000 watt | 1.3 | 2.7 |
Note! The input voltage of the inverter should match the battery voltage. (For example 12v battery for 12v inverter, 24v battery for 24v inverter and 48v battery for 48v inverter
Summary
- You would need around 2 100Ah lead-acid batteries to run a 12v 1000-watt inverter for 1 hour at its peak capacity
- You would need around 2 200Ah lead-acid batteries to run a 24v 5000-watt inverter for 1 hour at its peak capacity
- You would need around 2.6 100Ah lead-acid batteries to run a 24v 3000-watt inverter for 1 hour at its peak capacity
Battery to inverter wire size chart
Related Posts
- What Will An Inverter Run & For How Long?
- Solar Battery Charge Time Calculator
- Solar Panel Calculator For Battery: What Size Solar Panel Do I Need?
I hope this short guide was helpful to you, if you have any queries Contact us do drop a comment below. Thank You!
