Today I went to the camper van because I remembered a thick cable (it must be 6 AWG) that was coming from the battery to a spot under the bed. It ends up in M8 connectors, so from there I’ll pull the extension, because that cable is ideal (+ 1 meter extension so it reaches a cabinet where the inverter+charger will be installed).
I think I’ll simplify the system a lot, since as I said in the first phase there won’t be a huge load — I just want the connections to be done properly and i will not burn the charger or the inverter. I will use also same cable size for both inverter and charge controller. (6AWG) but with very short distances.
Sorry if I’ve been bothering you, but check out how I’m thinking of just doing it.
If you’re going to use blade fuses, just be careful. Under continuous load, they can get very hot, and their higher resistance will cause extra voltage drop. That voltage drop can raise the battery voltage as seen by the MPPT during charging, which may push the charger into absorption earlier than it should.
It’s worth adding a proper battery monitor on the battery itself and sending the corrected voltage to the MPPT over the VE.Smart network.
If you’re using 6 AWG cable, it’s good for around 55 A in typical DC installations. You’ll also want a 40 A fuse on the inverter, since its peak power rating of 400 W will pull over 30 A and even higher if battery voltage sags during load.
Just as a note, lord please don’t buy your electrical products -especially your safety products- from Temu.
do not worry i will buy from local shops cause i am also in a rush to finish this. Thank you
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