# Watts calculation for building and inverter

#### Nii Aryeetey

Joined Sep 16, 2020
3
Hello guys i want to build an inverter with 12VDC to 220VAC, 1000Watts
which type of battery, Mosfets and Transformer should I use

#### bertus

Joined Apr 5, 2008
20,750
Hello,

Do you realize that 1000 Watts can lead to a current of about 100 A on the battery side?
How long do you want to run on battery?

Bertus

#### Nii Aryeetey

Joined Sep 16, 2020
3
Hello,

Do you realize that 1000 Watts can lead to a current of about 100 A on the battery side?
How long do you want to run on battery?

Bertus
i want to run it for about 2 hours

Joined Jan 15, 2015
5,646
It's not that east, first consider this:
Hello,

Do you realize that 1000 Watts can lead to a current of about 100 A on the battery side?
How long do you want to run on battery?

Bertus
Next consider the size of the battery cables. Then under a full load the battery life.

Most inverters offer a few wave shapes out like MSW (Modified Sine Wave) or TSW (True Sine Wave) with the latter being more complex. Which output wave form can you use? Inverters of this type are easier bought than built. They also normally use a 24 volt battery to reduce the current draw.

A simple Google of Inverter circuits should give you some basic diagrams.

i want to run it for about 2 hours
Then you would need at least a 200 Amp Hour battery or actually about a 250 AH battery.

Ron

#### Nii Aryeetey

Joined Sep 16, 2020
3
or
It's not that east, first consider this:

Next consider the size of the battery cables. Then under a full load the battery life.

Most inverters offer a few wave shapes out like MSW (Modified Sine Wave) or TSW (True Sine Wave) with the latter being more complex. Which output wave form can you use? Inverters of this type are easier bought than built. They also normally use a 24 volt battery to reduce the current draw.

A simple Google of Inverter circuits should give you some basic diagrams.

Then you would need at least a 200 Amp Hour battery or actually about a 250 AH battery.

Ron
ok what of 500 watts
how much battery Ah and transformer Ah will i need

#### BobTPH

Joined Jun 5, 2013
2,538
Half as much as you need for 1000W.

Bob

#### Dodgydave

Joined Jun 22, 2012
9,419
The bigger question is what do you want to run on the inverter, and what current will it need ??