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The size of the panel won't tell you what the output is. Can you get to the junction box, where the lead exits the panel? There should be something on the cover to tell you what you need to know.
This site https://www.bimblesolar.com/mppt has all you need to know. I doubt whether the panel can put out more than 240w, so if you have a 12v system, a 20a MPPT controller would be ample.
The number and size of batteries don't affect the MPPT size required. It's the panel output that is key.
"..for the avoidance of any doubt, the broads are not legally a national park and do not come under the national park legislation, and nor will they." Parliamentary Under-Secretary of State for DEFRA (Hansard 2015)
Hi Jim For that size you would be looking at a max of 180/200w= 15/18 amps a 20 amp mppt would suffice But!!! if you decide/might increase the number of panels in the future i would recommend a 40/50 amp mppt, these are not much more expensive and as many people find when they have had solar they find it is so good they then want to increase the number of panels and then have to buy another controller and throw the first one away as you cant run them in parallel.The size of the engine has no effect on solar panels these are connected direct via a fuze to the battery's before the isolating switches Photo electronic or Bimble Solar are good sites to look at for advice. John