is this off-grid leccy stuff even eco-friendly?

Here’s my gut feeling, depends on the source of energy on the grid. If it’s diesel or coal, then yes, if it’s a mix it depends and if it’s already high renewable no.

If you can go net metering (Without battery) vs off grid that is “greener”. If the utility can do DSM with your battery when your connected that is likely the greenest option.

This may be a good topic for me to look into more. Stay tuned