How to convert battery capacity, for example 250 Ah at 12 V, to kWh at 220 V? I need to calculate how many and what kind of batteries I need to build a mini power plant.

You also need to take into account the losses of the device converting 12V to 220V.

Hello I`m going on holiday soon and I`m wondering, since there won`t be any electricity there, whether I`ll be able to provide some light using a battery. The case looks like this: battery: 100Ah 12V bulb: regular household: 40W 230V 100 Ah * 12 V = 1200 Wh => 1.2 kWh 1200 Wh: 40W = 30h Do I understand correctly that a fully charged battery will allow me to use a 40W bulb for approximately 30 hours?

When using a 12V/230V converter, you must take into account at least 30% losses. A 12V bulb will be more economical.

Converting 250Ah 12V Battery to kWh & Calculating Mini Power Plant Capacity Requirements

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#1 6531124 14 May 2009 21:53

rroobbaall rroobbaall

Level 11

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Post #1
6531124 14 May 2009 21:53

How to convert battery capacity, for example 250 Ah at 12 V, to kWh at 220 V? I need to calculate how many and what kind of batteries I need to build a mini power plant.
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#2 6531135 14 May 2009 21:54

pudzianowski pudzianowski

Level 28

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Post #2
6531135 14 May 2009 21:54

You also need to take into account the losses of the device converting 12V to 220V.
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#3 6531165 14 May 2009 22:00

kulmar kulmar

Level 32

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Post #3
6531165 14 May 2009 22:00

250 Ah * 12V = 3000 Wh = 3 kWh
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#4 8307927 19 Jul 2010 14:02

cmepro cmepro

Level 14

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Post #4
8307927 19 Jul 2010 14:02

Hello
I`m going on holiday soon and I`m wondering, since there won`t be any electricity there, whether I`ll be able to provide some light using a battery.

The case looks like this:

battery: 100Ah 12V
bulb: regular household: 40W 230V

100 Ah * 12 V = 1200 Wh => 1.2 kWh
1200 Wh: 40W = 30h

Do I understand correctly that a fully charged battery will allow me to use a 40W bulb for approximately 30 hours?
#5 8307938 19 Jul 2010 14:06

Hucul Hucul

Level 39

» | Positive voted Helpful post? (+29)

Post #5
8307938 19 Jul 2010 14:06

When using a 12V/230V converter, you must take into account at least 30% losses. A 12V bulb will be more economical.
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Converting 250Ah 12V Battery to kWh & Calculating Mini Power Plant Capacity Requirements

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