Originally Posted by davidhtam (Post 7429035)

Your strobe is rated at 640Ws (Watt seconds). Which means in 1 second, it will put out 640 Watts of power at full power. This is just the "strength" of your strobe or the amount of energy discharged from the strobe.

The inverter is rated at 600W (Watts) which is rate at which energy is put out from the inverter. Basically, the higher the wattage, the faster it will recharge your flash.

It's easier if you look at it in Joules.

Einstein = 640J (amount of power)
Inverter = 600J/s (rate of energy output)

You don't need a 600W inverter to power a 600Ws strobe... it's just the rate at which it will be charged. Hope that helps!

Not sure about what you mean about the battery needing to be plugged in... the battery obviously needs to be wired to the inverter, but it doesn't have to be constantly plugged into the wall. The only time you need to have it plugged into the wall is if you're charging it. The battery should be charged pretty much after every use and you should try not to full discharge it as that will reduce the number of cycles the battery can go through. If you're not going to be using the battery for a while, you should make sure it is fully charged before storing.