Originally Posted by WestCoastRV'er
The 250 watt fuse is to protect the Sine wave inverter. My understanding is that needs to be there and within 18" of battery. Since my solar panels should be able to keep the batteries totally charged, I was planning on turning off the built-in charger at the breaker panel. The wire gauge I used [solar->controller 8AWG 25ft and controller->battery 4AWG 6ft] are below the 3% loss recommended.
thanks for the suggestions. Will look into getting a 40-60AMP fuse between controller and batteries with a cut-off switch.
Oh yes. You're right about the fuse. I wasn't paying attention to your inverter. Most of the ones I see and have used are fused internally. You might still want to add a 300watt between the solar controller and the batteries.
Must have been late when I typed that. LOL Flip flop the fused cutoffs... a 60amp feeding into the controller, standard disconnect between the controller and batteries, then a 40amp feeding into the house 12v system.
I'll stick a picture of the ones I use. You can pick them up just about anywhere.
There is a lot of opinions when it comes to wiring. The gauges you plan on using certainly meet the standard minimums. Some potential bottlenecks can be avoided (increasing efficiency) by moving up a few gauges over the minimums. Such at the cable connectors. Larger gauge, larger connector surfaces, less heat, longer wear. A lot depends on your budget. When you start getting up into the $.80 an inch stuff.. it can get real spendy in a heartbeat.
Of course, if you're just looking to supplement your power needs for a couple 2 or 3 days of dry camping, you don't really need to go to the added expense to irk out a few more percentage points on the efficiency scale.
I know some fellas that use 4/0 for a 3 foot run. I'm in the "bigger is better.. but let's not get ridiculous" camp. Ever tried attempting to get 4/0 to go where you want it and stay there?
All in all it looks like you know what you're doing and should be really happy with the results. Nothing better than free energy.