48V Offgrid Solar Power System

$1300 for a almost 6.5kW inverter with 120A 48V (almost 6kW) battery charging? Uhhh heck yeah. As long as it doesn't catastrophically fail you'll probably come out ahead.

This gear deserves to be comodified. Just watching a Mouser catalog for a couple years on end tells a compelling story about how awesomely improved mosfets & other hardware has gotten in the past decade. Tacking on some decent control processing should not be that exotic an exercise. Home solar gear has held a botique price point, but increasingly I think it's going to be hard to justify, as downmarket competition provides increasingly clear value.