updated w/ shunt and 400amp fuse at the fuse block
Yes.right, so shunt between the busbar and battery negative?
right, so shunt between the busbar and battery negative?
i already have the inverter. i was planning on building this months ago but got distracted with, well, every other aspect of the van build.@starchy do you really need a 3000 watt inverter?
3000 watts at 12 volts is a monster.
400 amps fault current is no joke.
We could make you a less expensive system with a 2000 watt inveri
No, the shunt goes on the negative between the battery and the busbar so that all current flows through it.like this?
Now we know its a mobile application.i already have the inverter. i was planning on building this months ago but got distracted with, well, every other aspect of the van build.
like this?
Run length is about voltage drop.Curious about the spec for the 4/0 wire to the inverter. I have a 3000w inverter/charger that I plan to install to replace a 2000w inverter. A wire calc indicates that I can run 5' total wire length using #2 for 300A draw. The manual for my inverter/charger says recommended is 4/0 but no mention of run length so it seems they just spec the largest they can.
That indicates that 2/0 to 4/0 is acceptable for 300A @ 12v. The 2/0 has a 1.2% drop which is fine for the inverter feedRun length is about voltage drop.
AWG is about ampacity.
Have a look at the ampacity limits table here https://baymarinesupply.com/bosns_corner_wire_sizes
Yes but the 3000 watt inverter needs 400 amps fault ampacity.That indicates that 2/0 to 4/0 is acceptable for 300A @ 12v. The 2/0 has a 1.2% drop which is fine for the inverter feed
Every chart and calculator uses length and acceptable drop to arrive at a wire size. Only the AC charts I found just show cable size for amps flowing.
http://circuitwizard.bluesea.com/ also shows 2/0 for 300A over 6' total wire length (3' pos, 3' gnd)
Thanks, I went back and looked at the calcs. So the inverter can draw 400A? In my system that wouldn't be able to last long as the BMS units can only supply 300A (150A ea)Yes but the 3000 watt inverter needs 400 amps fault ampacity.
I already showed the math earlier in the thread I believe.
3000 ac watts / .85 conversion factor / 12 volts = 294.117647059 service ampsThanks, I went back and looked at the calcs. So the inverter can draw 400A? In my system that wouldn't be able to last long as the BMS units can only supply 300A (150A ea)