In a 39 inch by 65 inch sized panel, you could easily get up to 275w in a mono panel. That range in a poly are longer and have Voc's in the 40's. So you could easily have 500-550 watts and you could go PWM if you ran a 24v bank. I went poly because of the weather here but if you have good light go for the mono's.
That said I believe I recently got a email from solarblvd for their 230w panels at around 60 cents a watt. 460w should put you in the 30a range with MPPT at 12v.
I haven't seen complaints for the adjustable MPPT controllers from Tracer. Probably the least expensive way to go and still get temp compensation.
I thought about asking if anyone south of us wanted a few of those 250w polys brought down to Texas. A bit far for you though Mex.
