The only way to get full power out of high voltage grid tie solar panels is to use an MPPT controller. See the link above for detailed into on MPPT charge controls. Since most MPPT controls can take up to 150 volts DC (some can go higher, up to 600 VDC) on the solar panel input side, you can often series two or more of the high voltage panels to reduce wire losses, or to use smaller wire. For example, with the 175 watt panel mentioned above, 2 of them in series would give you 46 volts at 7.6 amps into the MPPT controller, but the controller would convert that down to about 29 amps at 12 volts.
Wenzhou Xihe Electric Co.,ltd ( The former: Beijing FANGPU SUNNYCO.LTD) is specialized in development, product, sales and services of Solar Controller, inverter system, etc in a body of professional company. It is committed to the development and utilization of new energy sources and is an advocate of solar energy applications.