Wiring control charger directly to inverter

[John Calf]

All the diagrams I've seen so far shows the charge controller's output cables going to the battery bank, where the inverter is drawing it's dc power from. So two cables on each battery post, or using a T. Any reason why we cannot attach the cc output cables to the inverter's dc input instead of to the batteries, they're all tied to each other anyway, no? As you can see, no electrician here.

[Rob Beckers]

John, nothing really against connecting them elsewhere, not directly to the batteries. You could connect them to the inverter terminals, if there is no switch between the inverter and batteries (you want to charge even when the inverter is off).

The only thing to watch for is that the inverter cables are sufficiently sized so there is no great Voltage drop when the inverter draws a large amount of current. The charge controller uses the battery Voltage to determine what stage of the charging process it should be doing. It's not super sensitive, a couple tenth of a Volt isn't going to make much of a difference over time, but it should be close enough to the actual battery Voltage to work well.

The Magnum inverters we use when a code-compliant install is needed have a wiring/breaker box (Magnum's MMP), and the charge controller wires into that, as does the inverter, with large-gauge wires going from there to the batteries. So there's nothing new to NOT connecting directly to the batteries.

-RoB-

[John Calf]

My plan is to install the cc next to the inverter, maybe 2-3 feet away. I'll be using 1/0 multi strand cable from the battery bank to the inverter. I was going to also use 1/0 cable from the cc to the inverter but the connectors on my cc will not accept the large diameter of the 1/0 cable.
My system will be 8- 225ah 6 volt batteries wired in series and parallel for my 24 volt inverter.

With this configuration, can you recommend what gauge wire I should use from the 60 amp cc to the 3000w inverter?
much appreciated