How many amps at 12 volt will a 700watt gennie give?

[Cliveshep]

Tonight I'm feeling brain dead.

What I would like to know is how many amps at 12 volt can I get from my charger when I run it on a 700 watt 240 volt generator.

Forget please sine-waves and circuit inefficiencies and loads of technical stuff, as it'll go right over my head.

Can someone please offer the correct simple formula to figure out the potential 12 volt current output from my 240 volt x 12 volt charger, i.e. what maximum setting I can use without destroying the gennie? The charger is not sophisticated, it's the better part of 25 years old with a controlled charge setting at max 30 amp and with a 100 amp booster setting for engine starting.

I want to put the charger on my 110 AH x 12 volt battery.

Thanks guys!

 

[elton]

In simple terms, I=P/V where I is current in Amps, P is Watts, V is obvious. And 700 Watts is 700 Watts regardless of voltage.

 

[Cliveshep]

Thanks for that Elton, can I therefore assume that if a 700 watt generator at 240 volt will still only give 700 watt through the charger at 12 volt, that is then equal to 58.333 amps (ish) from the charger at 12 volt?

 

[VicS]

If you have 700 watts available to stick in the front end then you'll get nearly 700 watts out the back end

700 watts at 12 volts = 700/12 = nearly 60 amps

but your charger output will probably actually be at about 14 or 15 volts

700/15 = a bit more than 45 amps

Should therefore give you the 30 amps Ok

but not the 100amps boost.

 

[Cliveshep]

Thanks Vic, you're more awake than I am!