These appear to be auto/marine, and 12v ... probably OK for that environment (where price is traded for risk), but not built to the same specs as, say BlueSea Systems' equipment. I would use these in a metal john-boat, but I would use BlueSea in a yacht (value of what we're protecting). Would have to read specs and such (easily available on BlueSea's site), and it is next to impossible to find these docs on Amazon purchases (you'd have to identify the manufacturer, hunt down their website, and find the right docs).
I'd tend to trust solar gear manufacturers (Midnite, Magnum, etc.) for having done the homework to ensure their breakers and such "work well in the solar gear" environment, and that they've tested enough to put their name on it and sell it in their own gear. I can't extend that trust to no-name amazon sellers, especially when we step outside their target use, and theres no docs to base the risk on.
OP is running 48v thru them (12v batts in 48v arrangement), so now these are no longer used in auto/marine environment, but in Solar gear environment. Now, the value of what we're protecting isn't just the solar gear, but also the surrounding structure(s), and again, I'd move away from the low-end altogether, probably past BlueSeas' gear in most cases, directly to high-end Solar Gear manufacturers. One fire, and the chances are good that the whole house or nearby structures would be in danger of going up. In my case, the entire landscape would start to go up (wildfire) ...
Note that I "cheated", and put all my solar gear in a utility shed separate and away from the house ... there's a bit more chance that if the shed goes up, I can save the house. Everything is surrounded by gravel, walk/road breaks, and thus I can hopefully save the landscape (note that we are on the hook if the fire escapes our property, and lights off surrounding property).
Lots to think about ...
www.stellavolta.com
