There's a post on Reddit describing a custom solution: https://www.reddit.com/r/Starlink/comments/sb4dei/homebrew_poeethernet_adapter_for_rectangle/

On Mon, Apr 18, 2022, 7:09 PM David Lang <david@lang.hm> wrote:
gien that the new dishy has the power supply built in to the router, an inverter
is really the only option.

I just picked up a cheap 300w inverter to use to power my dishy, but haven't had
a chance to try it out.

David Lang

On Mon, 18 Apr 2022, Bruce Perens wrote:

> I have rectangular dishy here in Berkeley where I can't test it, because
> we're not a supported area yet. Dishy is going to Macdoel, California, off
> of the grid, to run an SDR transceiver on 10 acres where I can have any
> antenna I want. There are currently "1200 watts" of solar (derate that to
> 25% for practical use) and a bunch of lead-acid batteries in a 48V system,
> inside of a hi-cube freight container.
>
> Currently my plan is to plug the router into an inverter. The one on hand
> is pure sine, but I don't expect Dishy to care. Switching power supplies
> generally have a wide voltage range and are independent of wave shape or
> frequency or even whether the input is AC or DC.
>
> I'd be interested if anyone else has had to produce off-grid power for
> Dishy, and how they have done it.
>
>    Thanks
>
>    Bruce
>
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