Solar system wiring question

[ontheroadagain]

Can one of the solar wiring gurus please advise me on my planned wiring.<br><br>From 24v panel to mppt I have #12 wire<br><br>from the mptt battery terminals to the inverter dc poles I have #6 wire<br><br>from the inverters dc poles I have #2 wire running to the batteries.<br><br>I added a fuse before the the mppt + terminal from the solar panel<br>I added a fuse just before the wire connects to the battery from the inverter<br><br>I know this is not the way people usually wire. they go from the mppt charge controller directly to the battery. then run heavy wire to the inverter. But there really is no difference because in the end they are all connected together either way. correct??<br><br>===================================<br>edited to add:<br>distance from solar to mppt controller is 8 ft.. from mppt to inverter is 4ft... from inverter to battery is 30 inches<br>===================================<br><br>thanks for the help<br>rick<br><br>**can anyone tell me how to insert a picture directly from my laptop. I don't have a http or url site

 

[wrcsixeight]

I do something similar.<br><br>My manual battery switch has 3 rather large studs. &nbsp;The battery 2 stud (house batteries) has the 2awg feed to my house bank, my solar feed wire, my Inverter wire, and my wire to my fuse block, all held securely with a 9/16 brass nut.<br><br>My battery 1 stud has nothing but the 2 awg cable to the engine battery<br><br>The third stud is the ignition stud, which goes to the original engine battery lug which is no longer attached to the battery. &nbsp;I also have a &nbsp;doubled 4awg wire directly from my alternator to this stud which , circuit wise, parallels the original charging circuit but is shorter and fatter and helps greatly increase alternator amperage when the &nbsp;house batteries are hungry, and the rpms are high enough.<br><br>I am using my battery switch as a power distribution hub, you are using the terminals on your inverter.<br><br>I see nothing wrong with either, especially if it helps to keep wiring shorter, and the wiring is capable of handling all the current combined with room to spare.<br><br>It's easier to have less ring terminals attach to the battery itself.<br><br>I'd just monitor the inverter studs and make sure they are not getting warm/hot. &nbsp;They might not have enough surface area, in which case some tightly fitting brass washers on both sides of the ring terminals can help.

 

[Zil]

I hope these numbers help. The capacity of your wires at 70F. <br>Your fuses should be sized to protect the wire.<br>Also as wrc68; Each connection is a resistance and should be inspected.<br><br>Solar to mppt, = 23 amp<br>mppt to inverter, = 62 amp<br>inverter to battery, = 120 amp<br><br>

 

[ontheroadagain]

wrcsixeight, could you show me a picture of the battery shut off that has the 3 lugs you connect to?<br>I went to a local electronics store to look for one but no luck. thanks for the info.<br><br>Zil thanks for the amps info but I am unclear what to do with what you told me