ORD 1869 - Laserfiche WebLink

(3) All main ungrounded battery input/output circuit conductors shall be provided with switched disconnects and over current protection. (4) A ground-fault detector and indicator shall be installed to monitor for ground faults in the battery bank. 690.72 Charge Control. (A) General. Equipment shall be provided to control the charging process of the battery. Charge control shall not be required where the design of the photovoltaic source circuit is matched to the voltage rating and charge current require- ments of the interconnected battery cells and the maximum charging current multiplied by 1 hour is less than 3 percent of the rated battery capacity expressed in ampere-hours or as recommended by the battery manufacturer. All adjusting means for control of the charging process shall be accessible only to qualified persons. FPN: Certain battery types such as valve-regulated lead acid or nickel cadmium can experience thermal failure when overcharged. (B) Diversion Charge Controller. (1) Sole Means of Regulating Charging. A photovoltaic power system employing a diversion charge controller as the sole means of regulating the charging of a battery shall be equipped with a second independent means to prevent overcharging of the battery. (2) Circuits with Direct Current Diversion Charge Con- troller and Diversion Load. Circuits containing a dc di- version charge controller and a dc diversion load shall com- ply with the following: (1) The current rating of the diversion load shall be rated at least 150 pement of the current rating of the diversion charge controller. (2) The conductor ampacity and the rating of the over current device for this circuit shall be at least 150 percent of the maximum current rating of the diversion charge controller. 85