even if it was long like 5 feet ?Here is how I do it.
I will assume 90% efficiency on the inverter.
the inverter needs to draw 5000/.9W = 5,556w from the battery.
On a system that size, I will assume 48V battery.
The most current will be when the battery is low, so the current will be 5556W/48V=116A (The 120A mentioned in the post sounds about right)
I then look at the top line of the Blue Sea Ampacity Chart. For 120A you will need 2AWG marine grade.
NOTE: Marine grade wire has a relatively high temp rating. Other wire types with lower temp ratings will require larger wire.
even if it was long like 5 feet ?
That is extremely dangerous. Those must be covered.Negligible voltage drop but a little risky with exposed conductors.
you don't get better crossection with these bus bars! a solid #2 or #0 has same or bigger cross section than your bus barsI have a lot of spare bus bars so i use these as conductor instead of wire. Fits perfect on my inverters terminals and 2x bus bars are equivalent to 80mm2 or between 2/0 awg and 3/0 awg wire. Negligible voltage drop but a little risky with exposed conductors. )
busbar are 2mm x 20mm and there is 2 of them in paralell. 4mm x 20mm is not 80mm2? XDyou don't get better crossection with these bus bars! a solid #2 or #0 has same or bigger cross section than your bus bars
yes you are rightThat is extremely dangerous. Those must be covered.
Plus the busbar has more surface area and no insulation so it should dissipate heat better.busbar are 2mm x 20mm and there is 2 of them in paralell. 4mm x 20mm is not 80mm2? XD
80mm2 is thicker than 2/0awg
Plus the busbar has more surface area and no insulation so it should dissipate heat better.
The OP really should put some shrink tube on those bars though.
I got some really wide heatshrink i intend to insulate the positive busbar. Should be "safe enough" I dont see much purpose of insulating negative bus bar though considering earth ground, ssc/inverter chassi grounds and AC ground are bonded together anyway and are huge surface areas with a return path to battery main negativePlus the busbar has more surface area and no insulation so it should dissipate heat better.
The OP really should put some shrink tube on those bars though.