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K. Rogers Residence 
This is a grid-tied PV system with battery backup. The first goal of this PV system is to keep the batteries charged and ready for use. This means less of the energy harvested by the PV is available to reduce electricity bills. Only when the batteries are fully charged will the system feed into the household service panel and sell to the grid. Any time the utility grid is unavailable the system can energize the backup loads, drawing power from the batteries. We can manage which of several backup circuits will be powered by the system via manual transfer switches (to refrigerator, well pump, misc. outlets, etc.). System Components   (15) REC215 modules (215 watts each, 3.225 KW) Xantrex grid-tied XW4548 inverter and MPPT 60-150 Charge Controller (8) Rolls Surrette 6 volt, 546 Ah batteries Additional Measures This is a custom built home with an emphasis on passive solar. It was designed with large areas of windows on the south (street side), thermostatically controlled thermal shades, air handling, and a rock bed. The passive solar system has been operating since its construction in the mid-80s. System Designer: Aladdin Solar System Engineer: Charlie Pickard System Installer: Aladdin Solar Date of Installation Completion: November, 2009 System Cost, Payback, and Financial Incentives Utilized $25,000 after the federal tax credit. (Unfortunately, the system did not qualify for the MN solar rebate due to afternoon shading) Anticipated Energy Delivery When Purchased 2,700 KWH per year. |
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