If you for compare take a Spectra Ventura 150 watermaker
You also have a 100 W solarpanel.
It produces 568 l/day.
I takes 9 A on a 12 V system, that corresponds with 109 W.
On a day it takes 24 h * 109 W = 2616 Wh/day.
Or together 2616 Wh/day / 568 l/day = 4.61 Wh/l.
The 100 W panel produces 1 A in mean value over 24 h.
This is on a 12 V system and that will be 1 A * 12 V = 12 W.
That corresponds with 288 Wh/day.
The system then give you 288 Wh/day / 4.61 Wh/l = 62.5 l/day.
You can scale it up and get 125 l/day with a 200 W solarpanels,
or 250 l/day with 400 W solarpanels.
It’s also possible to scale it down a little and get 20 l/day with a 35 W solarpanel. That will be quite a waste of money
since you have the same watermaker
and that’s the expensive part.
Regarding the units I used you can writhe your opinion under
the thread “Convenience of the metric system” under the “Off topic” forum.
Abstract. A system built with:
Spectra Venture 150 watermaker.
100 W solarpanel.
60 Ah battery
Will give you at least 50 l water per day.