What’s a kumquat?

Put a 12V to 24V inverter just inside the firewall. This will isolate the “noisy” vehicle power system from the more fragile solar panel and power bank. It won’t be nearly as expensive as an inverter that can survive the engine bay.

The 24V output of the inverter should be wired in parallel with one or several 24V solar panels, then into the power bank input. In this configuration the vehicle power system and solar system can charge the power bank simultaneously. No action is needed to change between power modes. However, you should have a main cutoff switch, disconnecting all power from the power bank.

I highly recommend a Victron brand inverter.

Warning: Direct current (DC) systems present an extreme fire danger. Every wire must be the correct gauge, every fuse the right size, every crimp correct. No piece of the puzzle is difficult. But, one must have all of them to build a safe and reliable system.

Assuming you’re coming from a linear programming and OOP background, then data (incl. SQL) kinda sucks because it’s not always clear how to apply existing concepts. But, doing so is absolutely critical to success, perhaps more so than in most OOP environments. Your post isn’t funny to me because I’d be laughing at you, not with you.

If a variable is fucked, the first questions you should answer are, “Where’d it come from?” and “What’s its value along the way?”. That looks a lot different in Python than SQL. But, the troubleshooting concept is the same.

If object definitions were replaced by table/query definitions in planning then you’d probably not have made the initial error. Again, it looks different. But, the concept is the same.