Comment: <span class="highlight">Solar</span> <span class="highlight">panel</span> regulator

Assuming that they are nominally 12 volt panels then their maximum output is at approx 18 volts. Therefore the maximum current will be 140/18 = 7.78A. With three panels in parallel that would be a bit under 24A total so your 30A regulator would work.
However if they are good quality panels you may actually get a bit better output than the rated 140W so you are very close to your limit.
BTW you have posted this in the blogs section rather than the forum section where it should be :).