Need help hooking up a 12 volt 2500 watt dc to ac inverter?

That will be drawing well over 200 amps.

Use both terminals at each side and make the two negative leads exactly the same length.

Also make the two positive leads exactly the same length (but they do not need to be identical to the negatives.)

That ensures the total current is equally shared between the two cables at each side.

The cables each need to be 25mm^2 [4 AWG] or larger to carry 100+ amps each.

If they are more than a metre or two long, a size larger would be even better to minimise cable losses.

(Personally, I'd use 35mm / #2 as a minimum in that application regardless).

The cables also need to be loose / separate for airflow and cooling; if you want to bundle them together they need to be over twice as large.

Anything smaller will overheat at full load and/or cause the supply voltage to drop and prevent proper operation.

http://www.engineeringtoolbox.com/wire-gauges-d_41...

Three problems here: 1. Normally one uses a charge controller for a high current charge of a battery. The wiring and the batteries will get too hot, maybe catch on fire without a charge controller. 2. You don't even report the model number or manufacturer. Their support manual would tell you what to do with the two sets of outputs. 3. You don't sound like you have any clue about what over 200 Amps DC means. You will likely kill yourself doing this. Get some hands on help from someone who might have a clue like an electrician who does these on a regular basis. Please don't kill yourself with pride.

That looks like a really dangerous piece of kit. Unless you run it from two separate battery banks, which is what the pairs of terminals are for, through cables rated for at least 150 amps, with a 150 amp fuse in each positive line, you are well on the way to starting a fire. Consider also the effect of the maximum discharge rate on the batteries, which might also get pretty hot.

If you use just one of each terminals, it may burn up if you actually draw 2500 Watts. You need both sets of terminals to handle the current. Expect the inverter to be about 80% efficient so the total current could be as much as 260 Amps, ie 130Amps per terminal, and they each need to be connected with #4 cables or bigger. 12 Volts and kilowatts are a bad mix. You should think about getting a 24 or 48 Volt inverter. Note that a 100Ah battery will only last about 20 minutes. "DO THE MATH !"

BOTH RED AND BLACK DOUBLE TERMINALS ARE PARALLEL TO EACH OTHER .

JUST CONNECTING BATTERY POSITIVE TO ANY RED AND NEGATIVE TO ANY BLACK SHALL DO.

Hi so lets start with what amp hours this requires. as these devices are only 50% efficient anyway. you will need twice the input power to achieve the full 2500 watts.

so 5000 watts /12 = 417 amps of power so any less and power dies in less than an hour. so given if you don't use the full potential of twice the output power say 50% it is still going to need 208 amps. with most car batteries this would be 70 amps. so 20 minutes maximum time.

I have the specks from cobra but they don't tell me squat. I also have the inverter so don't send me to a sight that sells them.