G'day May I suggest that you repost this in Techies Corner. There are big mobs of experience there. I am also interested in the answer as I am in the same boat.
Cheers.
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Jack Cherie and the memory of the four legged kids.
A quick reply would be that the 20a charger would work but be too slow.
If you used the two batteries down to 50%, as recommended maximum draw, then to charge back the 120amp-Hrs would take 6 hrs at 20 amps. This may be OK on a good day of sun, or long driving. But on a bad day or short drive it would not be enough time to put the charge back.
This is a simplistic answer but will give you some ideas to start.
Jaahn
-- Edited by Jaahn on Friday 15th of April 2016 09:37:30 AM
Unless you add more solar the output won't be anywhere near 20 amps anyway, more like 10, so for your 150w panel it will be fine.
I agree though that charging will be slow so an additional panel as well as a second battery would make all the difference.
If you go over 300w I'd upgrade the solar controller.
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Cheers, Gerry Lexus LX470 2012 Traveller Sensation Pinnacle 21' Member VKS737 - mobile 3535
