This may be of interest.......from the NEC newsletter http://www.necplus.org/Features/Pages/ThePoweroftheSunResearchinSupportofSafePhotovoltaicPower.aspx?sso=0 Holt E. Kelly Holtek Fireplace & Solar Products 500 Jewell Dr. Waco TX. 76712 254-751-9111 www.holteksolar.com