I have to say Signature Solar replaced the bad unit and I now have two Eg4 set up for 230 volts and running well, batteries do not charge below 28 degrees, so I have a propane heater to keep them warmer. Only current problem is the system will not charge the batteries from the generator. Working with Signature to find solution.
Glad you were taken care of ....Did you ask Signature Solar what they recommend for a breaker-fuse.???
They sold you the stuff Minus the panels .... right? No doubt would be interesting to see their recommendation for your solution.
Reading through this mess from other ppl is typical on forums now and in the past. The welding forums went through same thing 15-20 years ago as China inside appeared. Then welders changed from transformer based to mosfet igbt based light weights.
on here just like then and there Ppl are commenting just to comment..... ie: drinking all the kool aid with no clue as to the various flavors. There are a ton of things could say about the responses you have gotten but again typical with forums like this. I have extensive experience in power generation and motor management from design software and end item Production - in the field research about 35-40 years of it. Toot toot blowing my own horn..... I can pee on the big trees too.
I think some confusion on their behalf is not looking at your system components ie: the EG4 server rack style 48v batteries come with the 100 amp circuit breaker. Some of the commenters seem to think you added the breakers and are were all wrapped up in it. Hahhaha okay so some ppl need a picture...
When you are working with Bleeding Edge technology can bet you are certifiying it in the field with your application - you are literally doing the long term research and development for the manufacturer out in the field. The 500volt high solar input voltage means when something goes wrong it is going to be bad .
when you collapse a field suddenly the power the voltage goes crazy high. Never know what you are going to get.... until it happens.
I worked on diesel electric locomotive power generation primarily some aircraft.... as well as some automotive. The limiting factor is not really the wiring but the temperature of the melting point for the insulation. 10ga wire usually rated for 30 amp home circuits but can cover up to 40 amp although 8 ga is highly recommended. That is account of the insulation factors. The actualy wire can easy carry 2-3x rating losing more and more as it turns into a heating element.
General Electric was wanting to reduce the number of failures to the power rectifier fuses blowing on locomotives. So they simply removed the 900-1100 amp fuses depending on model locomotive then installed: buss bar, a Current Transformer that fed a computer circuit which was suppose to react in time to stop any damage. The results were catastrophic disaster..... 1600 cable vaporized in sections.... hahahaha Big difference for theory vs reality.
Same as designing setting up ground relay circuit testing for the locomotive main alt. Those big diesel engines basically just run the big alternator everything else is mostly electrical. Anyway: Using a fuse and wire might work to trip the ground relay most times...took trial and error ..... but sometimes the wire inside the insulation would vaporize.... the fuse would still be good. The insulation would still look good after it danced in the air before disappearing. Hahahaha So electricity although it has basic rules does not always follow them. Hahaha
Why these inverter companies stipulate such large wiring.... safety zone..... they know these inverters are going to fail. Not if but when.
In a good place and time the companies would seek these FAILED products returned so could R&D them more with a dive into failure reasons to develop improvements. I suspect the 500 volt pv or maybe 400 volts you described is problematic and not reeady for prime time.= failure.
BTW be aware the EG 3000 inverter you have is very limited for actual pv current input. If you start going parallel vs staying in series will find another problem. You'll end up with another fire. Bring the hot dogs and marsh mellows. This is the exact reason these inverters can't get UL listings. Bleeding Edge Technology.... everyone is rushing to make money from it too. The technology has been around for a long time just not implemented like now. If you burn your house-rv down then the insurance might deny the claim too.
Again ask Signature Solar what they recommend based on your system and then share the info. They are selling you the system so they owe you some based tech support. Should be interesting to read and make them earn their drop shipped money. ??
Let us know about the generator issues.... some inverters will not phase - cycle frequency lock with the generators - need a newer inverter-generator and even still that can be iffy. . But will be interesting to see the resolve. You are paying to be a pioneer and factory tester. ??