Best way to run 1500 inverter - Converter ON, Battery sw OFF? or reverse?

[dmdomokos]

I wired a 1500w modified sinewave inverter directly to my batteries. It appears I can run it two ways. I plug shore power into the inverter then 1)turn off the converter breaker and now 12v is powered directly from the batteries and 120v through the shore power connector from the inverter. OR 2) turn the battery disconnect to off, and now the converter is running the 12v power and the inverter is running the 120v through shore power connector as before. But which way is better?

[boondocking]

Use 1) - I would turn off the converter, no need to run something that is not needed at the time. The other way [ 2) ] you are using 12vdc to produce 120vac to power the converter's 12vdc to run the 12vdc stuff.

[Blackhat6mike]

Originally Posted by dmdomokos

I wired a 1500w modified sinewave inverter directly to my batteries. It appears I can run it two ways. I plug shore power into the inverter then 1)turn off the converter breaker and now 12v is powered directly from the batteries and 120v through the shore power connector from the inverter. OR 2) turn the battery disconnect to off, and now the converter is running the 12v power and the inverter is running the 120v through shore power connector as before. But which way is better?

If I understand what you are asking, you don't need the INVERTER when plugged into shore power as that IS your source of 115 VAC and your CONVERTER should remain on to provide 12 VDC to power your onboard things.
If the INVERTER is turned on, your CONVERTER should be turned OFF as you are creating a loop [inverter powering converter that charges the batteries that run your inverter.] Big problem!

[dmdomokos]

Good point, didn't think of that. 12v to 120v to run 12v. Batteries running 12v system directly would seem to have less losses.

[boondocking]

Blackhat - He is not plugged into shore power, he has the shore power cord plugged into the inverter.

[dmdomokos]

Blackhat6mike - No shore power to connect to, boondocking setup. I am plugging the shore power connector into the inverter to get 120v to the trailer. It's the 12v system that is in question. Is it better to disconnect the batteries from the 12v system and only use them to run the inverter (converter runs 12v system)? or turn off the converter and run 12v directly from the batteries. 120v still comes from plugging shore power "cord" into the inverter,

[Blackhat6mike]

I didn't think I was understanding the question. Duh!
This is what happens when you have a bad contact between your ANL fuse in the battery to inverter cable.