Which Controller for 1KW-Solarpanel-Array and 800Ah Batteries is the best?

[inetdog]

Ok, thank you for your message. But I can hardly imagine a wire of 15 mm diameter. Can someone show me an image of this wire?

You can get close by looking at the wire from the battery + to the starter motor on a large truck. Also look at the output wires for a large electric arc welder.
It will be stranded rather than solid wire, of course.

Now, depending on the length and how much current the inverter charger draws at full load, 15mm may be overkill. Take a look at this link for specifications.

Here is a picture and some price information. And another site. It is very expensive, although you may find better prices elsewhere. (Check our sponsor, although it looks like they only sell the pre-made wires with connectors attached.)

This picture shows a 25 foot coil to give you a better idea of the scale.

Note that 4/0, as shown, is only about 11mm in diameter.

[Sunking]

Now, depending on the length and how much current the inverter charger draws at full load, 15mm may be overkill. Take a look at this link for specifications.

So far we are not talking about the wire between the bat and inv.

Look at the wire between panels and inverter. NM 14-2, same as battery to inverter. 30 amps at 34 volts at around 240 loop length.

His saving grace right now if you look at my diagram is the batteries are an incomplete open circuit. If it was a complete circuit, BOOM!

[inetdog]

So far we are not talking about the wire between the bat and inv.

Look at the wire between panels and inverter. NM 14-2, same as battery to inverter. 30 amps at 34 volts at around 240 loop length.

His saving grace right now if you look at my diagram is the batteries are an incomplete open circuit. If it was a complete circuit, BOOM!

Good point. When you talked about safety based on the #14 (approximately) wire, I was thinking of the shorter wiring at the batteries and the inverter where relatively high currents could exist.

The 240 feet of (assumed) #14 will have a resistance of about .7 ohms, and so a voltage drop at 34A of about 23 volts. So the CC is clearly not going to be able to take that much current from the panels to charge a 24volt battery bank.

More likely the result would be closer to 10A with a VD of 7 volts. That is well within the capability of #14 wire. And if you are looking instead at current flowing from the panels directly to the inverter, it will not be much, if at all, greater than the current into the inverter, also through #14 wire (maximum current will be with all power going from panels directly to inverter, since the lower voltage will not charge the batteries at all. Also, maybe not as much since the inverter might turn off from low voltage before the current from the panels reached 34A.

End result, the panel to battery connection will not make anything go boom. It will just make it all fail miserably. Whereas the battery interconnects and the battery to inverter wiring could very well go boom in a place where the OP could be standing.

P.S. Not to mention that one of the steps in fixing the wiring will probably be to short out one or more of the batteries rather than just connecting them properly.
You are right that he needs more help than we can give.

[Sunking]

End result, the panel to battery connection will not make anything go boom. It will just make it all fail miserably. Whereas the battery interconnects and the battery to inverter wiring could very well go boom in a place where the OP could be standing.

Like i said the way it is wired now is saving his cookies, it is a open circuit, thus no current flowing. Correct the wiring and it goes boom.

Now you now why I will not help him. He is in way over his head and does not understand. I really wished I could help, but way beyond the scope of a forum. It will take hands on and something I do not think he has. MO MONEY.

Mods close this thread before someone gets hurt.