4 AWG wire in fronius plus 11kw inverter

quique

I'm seeing that if I want to run the exiting 60A from the inverter AC side for about 2 meters to the main service panel with copper threaded wire in conduit, I need AWG 4 wire. But I'm wondering about the feasability of getting an AWG4 wire into the inverter AC terminals. Has anyone done that?

BB.

Re: 4 AWG wire in fronius plus 11kw inverter

Here says 6 AWG is maximum size:

http://www.fronius.com/cps/rde/xchg/SID-787B745F-57D118BF/fronius_usa/hs.xsl/2714_1483.htm

Admissible conductor size (DC) No. 14-6 AWG

You would need an approved wire connection device to "down size" the 4 AWG to 6 AWG prior to connecting to the inverter.

-Bill

Cariboocoot

Re: 4 AWG wire in fronius plus 11kw inverter

6 AWG is sufficient to handle a 60 Amp load. That's probably why they made the terminals capable of connecting it. 2 meters is not very far. I wouldn't worry about trying to put 4 AWG in at all.

inetdog

Re: 4 AWG wire in fronius plus 11kw inverter

Cariboocoot wrote: »

6 AWG is sufficient to handle a 60 Amp load. That's probably why they made the terminals capable of connecting it. 2 meters is not very far. I wouldn't worry about trying to put 4 AWG in at all.

But for those who are running longer distances (tens of meters or more) and really need to use 4 AWG or larger, keep in mind that you can splice a short piece of 6 AWG onto the end of your larger wires using a suitable crimp or screw connector and not have to worry about what will fit into the device terminals.
As long as you need the large wire for voltage drop over a long run rather than for allowed current carrying capacity, there is no downside to that approach except perhaps a little extra local heating at the splice.

Cariboocoot

Re: 4 AWG wire in fronius plus 11kw inverter

11kW at 240 VAC is about 46 Amps maximum.
6 AWG will handle that up to a distance of 190 feet before V-drop rises above 3%.

It is not likely to be a problem.

BB.

Re: 4 AWG wire in fronius plus 11kw inverter

My mistake, 4 awg is fine for the ac output. 6 awg was dc input.

-Bill

quique

Re: 4 AWG wire in fronius plus 11kw inverter

inetdog:
You mean use a piece of awg6 just to make the awg4 wire fit into the terminal?

Caribocoot:
Thanks

inetdog

Re: 4 AWG wire in fronius plus 11kw inverter

quique wrote: »

inetdog:
You mean use a piece of awg6 just to make the awg4 wire fit into the terminal?

That is one way of putting it, yes. Connect the jumper wire solidly and insulate the connection point well.
But more precisely you would not be making the awg4 wire fit into the terminal, you would be extending with a piece that would fit into the terminal.
And bend more easily inside the case if that turns out to be important too.

Blackcherry04

Re: 4 AWG wire in fronius plus 11kw inverter

I hate to buy anything I think is overpriced, but there is a time that I just go with the flow and eat one less Big Mac. A bad connection can cost you way more than the cost of these. I tried to resource them elsewhere, no joy.

2 & 4 gauge custom lugs. By the way , the price is for one each, not a pair.

You can also grind down a Anderson Connector lug and they will work, but they cost about the same.

http://www.thesolarbiz.com/Battery-Charger-Lugs-Custom-4-Gauge
.

oil pan 4

Re: 4 AWG wire in fronius plus 11kw inverter

Use this, cant go wrong.

Since a 46 amps is best case scenario and we know how rarely the best case scenario ever delivers with anything solar you likely will be fine with 8ga wire.