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Are you building a 12v system?

I agree that's what I think of when I see darker copper. @12VoltInstalls may be right that it's the rubber jacket of the windynation wire that is breathable and allowing the oxidation. I'm not gonna be using these wires anymore so I won't bother wire brushing them and making a mess of copper dust.

The Inkbird is the obvious suspect. Freezers and their control logic expect to be powered 24/7.

Oh I use the lightbulb to drain + and - on the battery terminals. I don't think my inverter would let anything out the AC side when it's off. But I've never tried.

Yup, works good on mine.

On my XW yes, the caps will shock you with 48V.

I like the Temco PV wire. But I only use it at the array. THHN in conduit for the rest of it.

I hadn't heard that about the V3 but idk.

280 V3 with the octagon terminal is good, but I haven't really followed the MB30/31 news.

That would concern me for a different reason... That my dentist might be eruopean.

I would be concerned if my dentist was running on an inverter and it wasn't a Schneider XW.

Pools are another one that creates second earthing points. Don't worry about it, just make one intentional grounding point. The electrons will respect the intentionality and go there.

I thought it was a year after applications and the window is closed now.

Good catch! I missed that. Not even a tariff increase for us now. Unless our cells get automatically considered EV batteries or something. I could see that being true where they mean like power tool batteries get the tariff in 2026 but big Lifepo4 cells are already considered an "EV type" battery.

Or wait, just manually disqualify grid? It already has contactors in the XW for this. No need to duplicate the functionality.

I just use an AC contactor.

https://www.theverge.com/2024/5/14/24156249/us-biden-china-tariffs-ev-solar-battery-semiconductor-critical-minerals There it is, yall. Not great, not terrible.

It's 8 watts. That's just like margin of error, or they're running cooler than their rated conditions range, or whatever. Not a mystery to track down.

You should have a main AC breaker panel and that's where neutral and ground are bonded and where the ground rod is connected. Inverter gets grounded to the main panel.

Yeah I would change to a bolt lug holder.

Twice the cost of what? An AIMS 120v or something? So out of spec wiring of a 120v hot and neutral to the hot plugs of a 10-50? And expect it to draw 35 amps at 120v? I doubt that will work. I just don't understand what you're trying to avoid or save here. Please provide some comparison...

240v 30 amps and 120v 60 amps is the same amount of power.

I like that Signature is doubling down on receiving in person customers. Would be cool to see a Sacramento, Stockton, or Modesto location some day. I mean even closer would be better, but central valley is cheaper and sits between all the mountain off gridders.

I wouldn't buy 12v batteries to put in series.

Signature solar is cheapest in the US, not sure if you can order direct from there.

The ventilation upgrade in the utility room may get delayed...

Awesome. Probably someday for me then. But I won't really have a good excuse for it until my XW dies and that could be a while.

Fantastic! Thank you. How are the fans at 1-2kW load? I'm sure they modulate, but down to just pretty quiet or very quiet?

Did you do a derating calculation?

I think maybe when you derate you get to replace a 1.25 so instead of x 1.25 x 1.25 = 1.56x it's x derate x 1.25 = ampacity required. But not positive about that.

Here's both outdoor and rooftop: https://www.copper.org/applications/electrical/building/rooftop.html

https://www.copper.org/applications/electrical/building/pdf/rooftop.pdf

The NEC has derating calcs for environmental temperature, and somebody maintains an industry database for what temp to use for different areas. It's like a copper association or something.

Warranty and technical support add significant cost.

I wouldn't worry about it. Signature isn't Amazon it's not satisfaction guaranteed with free shipping both ways but they're real, not a scam, and I believe they do try to figure out how to handle this stuff fairly in a business where user error is the norm. And if you do have a problem, you can...