Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: OT power inverter question 2000 watt continuous
If the electrical system can't supply sufficient CURRENT to the inverter, it will show up as a drop in VOLTAGE at the inverter.
Flip side of the coin: If there is rated input VOLTAGE or more, at the inverter input lugs, it is getting as much CURRENT as it wants. If there is still a problem, it's inside the inverter.
The key to evaluating the situation is to check the voltage available AT THE INVERTER while the inverter is under load and about to fail. Knowing the voltage when the inverter isn't being used will, as you suggest, tell you nothing. You would read battery voltage, even if the inverter were connected with the smallest wire you could find.
As the current flow into the inverter increases, the voltage at the input lugs will fall. That is inevitible. If it fall too far it means that the inverter isn't getting enough current.