|Solar PV Home System (SHS)|
If in a village the homes are more individually spread across the village, often the single solar PV home system is the best approach. Thus RIDS-Nepal has developed a further approach to the already established two concepts of the 2-axis tracking and the cluster system approach, the Solar Home System or SHS. Thus, since 2006 in suitable villages, where people think that SHS are the most appropriate solution for basic indoor lighting systems, SHSs have been installed in Humla. Each household owner is responsible for his or her own system. Frequently, we have observed that a healthy competition arises due to each owner's pride for their single solar home system. That increases the likeliness that more care and maintenance takes place, increasing the solar home system's reliability and life expectancy.
Figure 1: A Schematic Diagram showing Solar Home System
System SpecificationsThis system is comprised of the following major components:
Solar PanelOne, multi-crystalline (Kyocera KC16T) Solar PV module with a rated power output of 16WR is used. This solar PV module is installed of each household’s roof, either on a fixed angle frame (at 30° south inclined), or on a tilt angle adjustable frame (from 5°-60° south inclined).
Battery and Charge Controller Box
The Battery and Charge Controller box, locally manufactured by PPN, consists of two 12DCV 7.2Ah glass-matt Gel lead acid batteries (no maintenance needed) and a locally manufacture charge controller, with battery bank voltage protection levels at 14.4 VDC at the higher, charging level, and 12.0 VDC at the lower, discharging level.
DC LoadsIn each household two 12 diode Nichia lamps, with NSPW510DS diodes, and one single, high power, Luxeon diode, WLED lamp are used in each household. Each of these three WLED lamps consumes ~1watt, amounting to a total household power demand of slightly more than 3 watts. All these WLED lamps are locally manufactured by PPN.
BenefitsThen SHS provides a locally appropriate and sustainable elementary home electrification system, if each household is individually located and at some distance to its neighbors. As the SHs is small, easy, save and quick to install, the users like this system.
SHS Systems in Humla
Dharapori VillageDharapori village is located at latitude 30°0'19.38" North, longitude 81°46'0.5" East and at an altitude of 2,368 meters above sea level. All 50 households of the village are electrified with each a SHS, each home with three WELD lamps.
Figure 2: Solar Panels of Solar Home System in Dharapori Village
Lamakholsi VillageLamakholsi village is located at latitude 30° 0'48.45" North, longitude 81°45'5.14" East and at an altitude of 2,586 meters above sea level. All 35 households of the village are electrified with each a SHS, each home with three WELD lamps.