Looking for advice

[Cavinaar]

Below is what the current plan is.  

My current system does not include the solar cutoff, the 2nd battery, the smart shunt, the dc-dc charger or the buss bars.  The current charge controller is an Epever 100|30 and the current inverter is a 1000W.

I'd like to know if there are any glaring mistakes or things I could do differently for higher efficiency etc.  The grey ovals are fuses sized for the wires they are connected to.

I didn't include it in the diagram but I also have one of those big red switches that I want to use as a battery power cutoff switch.  My question on that is it better to add it before or after the fuse between the battery and the buss bar?

[RoamingKat]

First, I would move the mppt ground to the ground buss barr. This then includes it in the shunt. Include ground from yhe battery side of the shunt to ground to chassis. Move the battery connection from the mppt to the positive side buss bar. Keep only one connection to the battery…power to master switch. ground to shunt. No other connections directly to battery.

Also…a power side master switch shut off should be the very first terminal from the power side of the battery…which also means the power side of the mppt should be wired to the power buss bar. You will have to remember to shut off the solar panels first before cutting the power with the mater switch.

Finally…you will need a short wire with capacitor from power side of battery to power side of inverter. Not a perm connection, but whenever you shut down the system with the main power shut off…before turning it back on you need make that temp connection for just a second or two. Otherwise the sudden power drain from the inverter will freak out the BMS and shut your system down (it is powerful enough that you might blow a chunk off the battery terminal.).

What I did in my system…i kept one buss bar dedicated for all grounds, one buss bar for all power input, and one buss bar for all power output. It is amazing how fast you will keep connect8ng more and more…keep the wiring simple, and only have one connection to battery terminals.

[RoamingKat]

One more thing….you didn’t really ask about fuses. So, anyway…

I suggest you make the cable from battery to master shut off switch 00 gauge. From there to the power buss bar it should be sized for the max your system could ever make. I have 200 amp on that

Then you can just drop out to fuse panels after the output power buss (be sure you label the wires). The fuse from the MPPT to power buss bar should be sized to max you could except. (Remember to check the round trip distance when calculating the gauge you need).