http://openfarmtech.org/wiki/Solar_Concentrators

To obtain higher power production we combine the modules in series and parallel, as if they were batteries. A 10 KW concentrator connecting in parallel increases the amount of energy produced at a constant temperature and putting them in series multiplies the amount of energy produced at increasing temperature, because you multiply the TD. Combining the two architectures, parallel and series, you can get what you want and stay strictly in the same safety parameters.