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Comparing your size to sizes of panels on ebay yours looks to be in the ball park for 200w. I expect that panel sizes for a nominal wattage will vary a little, depending upon manufacturer , panel type & panel efficiency.
It is possible your panel is either more efficient or a bit less than 200w
Also possible that your mates 250w is not 250w.
There have been panels sold on ebay & elsewhere that are lower wattage than advertised.
Only real way to check is to set up both panels, connected to a discharged battery & measure the amps being fed into the battery. Needs to be done at the same time so sun condition is the same for both. This will tell who’s panel is putting out the most. 200w should be capable of around 11.6 amps & a 250w around 14.5 amps (both figures + or minus a bit).
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)