question

kevingeerts avatar image
kevingeerts asked

AC vs DC usage

We have a victron mulitplus inverter so that we can always have AC if we want.

Let's say we have a device on 12v that states it uses 120watts, this would mean the amperage is 10Ah (120/12). So if this device is on for an hour it will extract 10amps from the batteries.


How does this work if you have a 220v device that also uses 120watts. Will it still be those 10amps (plus a bit of inverting loss?). Or am I completely wrong here?

amps
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duivert answered ·

Hi. Yes if your battery is also 12v its also 120W when inverting to 220v, so 10A, if youre battery is 24v its also 120W but 5 amps when inverting to 220v (losses not calculated!)

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Fideri avatar image Fideri commented ·

@duivert

I'm confused. I thought that if you use 220v and your device takes 120w, then you will need ½ an amp (i.e. 120/220).

F.

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duivert avatar image duivert Fideri commented ·
Hi yes if you invert from 12v with120w to 220v 120w its 10 amp at your battery side and 0,5 amp at 220v side
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Fideri avatar image Fideri duivert commented ·

@duivert

Understood, thanks.

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kevgermany avatar image kevgermany ♦♦ commented ·
@kevingeerts

There's also a standby draw with no load. See your inverter's data sheet for this value.

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