Charging our cars with 3000W Inverter

It should work ok. I have tested my output from my 120 vac circuit that's connected to the parking lot lights. My Kill-A-Watt meter measures about 12 amps for about 2 hours and 24 minutes then drops to 6 amps for the remaining 10 minutes of charging. My voltage drops to about 109 vac. I have been charging my PIP for two years with no issues.

 

when your battery is putting out 15 amps for 5 hours, what is coming out of the inverter?

 

The inverter controls what current comes out of the battery not the battery, if the battery capacity is 15 amps for 5 hours it should be ok

SGH-M919 ? 4

 

Should be 12 amps if it's hooked up to the Pup

SGH-M919 ? 4

 

what is a pup?

 

d**m autocorrect lol "PIP"

 

shows you what i know, i thought you were referring to a hookup point.

 

I stand corrected, what ever is hooked up to the inverter output (120 vac side) determines how much amperage is drawn from the battery. The inverter can handle up to 3000 watts instantaneously or 1500 watts continuous. Since the charging circuit in the PIP is around 1440 watts it's below 1500 watts.

Ohm's Law Calculator

Enter any two known values and press "Calculate" to solve for the others.
Voltage (E) = Current (I) * Resistance (R)
Power (watts) = Voltage (E) * Current (I)

Voltage (E): Volts (V)
Current (I): amps (A) milliamps (mA)
Resistance (R): ohms (Ω) kilohms (kΩ) megaohms (mΩ)
Power (P): Watts (W)




120 volts, 12 amps =1440 watts

 

so that's more than enough to charge the pip battery?

 

Yeah, 120 volts and 12 amps is worse case scenario, in reality it's a little less

SGH-M919 ? 4

 

that's the same as i'm getting from my wall, so 3 hour charge?

 

For me with .9 EV left it's 2 hours and 34 minutes

SGH-M919 ? 4

 

No problem with the inverter, but if you want 1440 watts out of it the battery has to put 1440 watts into it. So by Ohm's law, if on the inverter side 1440 watts = 120 volts at 12 amps, then on the battery side 1440 watts = 12 volts at 120 amps.

In other words, there's a ten to one ratio between the two sides of the inverter when you're calculating the current. If you want 12 amps on the 120 volt side, you have to put in 120 amps on the 12 volt side.

The OP said the battery will put out 15 amps max continuously, which at 12 volts is only 180 watts. And that's all you can get out of the 120 volt side of the inverter, less the conversion losses.

 

Oops my bad, you're right

SGH-M919 ? 4

 

I knew that one day all those years of studying EE would pay off!

 

You got me beat, only associate in BMET here

SGH-M919 ? 4

 

Actually Ohm's law is about as far as I go with it these days, having drifted from electronics into systems analysis and programming many years ago. Both fields do need logical thinking, though.

 

So the question becomes: is there enough wind to charge a 2-4 battery bank to run the inverter?

 

if we all "break wind" together