Visit Cambodian Primary School at Chom Bok, Aoral

On 2 April 2013, we visited a local Primary Cambodian School at Chom Bok, Aoral. They have about a 100 childrens. The PKH supported the local school and provided English teachers.

 

English Teacher, Mr. Sokha Bunthoern

PKH Aoral, Cambodia - Sorting Library Books, Tools & Clothings

In April 2013, we stay at PKH, Aoral, Cambodia Mission House and help to sort out the library books and data entry the details of each books into the database.

Next, we help to sort out all the donated tools shipped from Singapore to Aoral and ensure all the items are accounted. A photo of each item are taken for reference.

We also help to sort out all the donated clothings and pack them into boxes which are later given to the poor.

During the month of April, the temperature inside the Aoral Mission House is hot with temperature reaching 38.5 degrees Celcius.

In October 2013, we visited Aoral again and the temperature is much cooler and all the tools have been properly stored and arranged.



Solar Powered Security Lighting (240W)

We planned to install the 240W Solar Powered Security Lighting at PKH, Aoral Training Centre. The building was not completed so we could only partially install the system, i.e. the Solar Panels on top of the Water Tank.

We tested the charge controller, deep cycle batteries and inverter together with the solar panels as a system and wired them to power a CFL Lamp. The system work fine and will wait for the building to be completed before the locals can wire up the 9 CFL lamps along the corridors of the training centre.

The system block diagram and calculations are shown below.

To be continued.

Replacement of Batteries for the 1KW Solar System at Aoral

The 1 KW Solar Powered System at Aoral, Cambodia was installed in 2008. The batteries were working since then until today (April 2013). Most operations at PKH Aoral were for day time usage until the expansion of PKH Aoral to become a Training Centre for Hospitality and Technical Training for the surrounding villagers.

The batteries were operating for the last 5 years. The batteries have exceeded its operating life and acted as capacitors and did not store electricity for night usage.

The battery voltage over a 24 hours period was data logged and presented below. Two fans were operating, 2 notebooks were charging and a PC witch ON.

 
A new set of 10 Deep Cycle Batteries were purchased and installed at PKH, Aoral. The Batteries Voltage was monitored and data logged for 24 hours. The results of the data logging is shown below.



As we can see that the battery voltage is more stable 2 fans, 1 notebook charging and sometimes the PC is switch ON. Between 6 to 10 pm, the generator is turn ON and the solar battery is switch OFF. After 10 pm, the generator is switch OFF and revert back to Solar. At night, 2 Fans and a Flourescent Lamp were ON the whole night. The batteries were able to sustain the whole night operations with a day charging.

The system calculations allows 4 Fans in the Mission House to operate for 8 hours at night and 3 Fans in the Office for 8 hours during the day. It has 2 days of stand-by battery charge.

The second graph shows the battery voltage taken 6 months later (October 2013) for 2 days.

Installation of Street Lighting

We have installed 3 stand-alone solar street lighting at the PKH Aoral Training Centre. Two of them are mounted on a metal pole and sits on the ground, with cement foundation. The third lighting is mounted on the roof top of the Guard House.

 

The design and calculation for the stand alone street lighting is shown below.

 The Charge Controller is designed in-house with the following specifications for the battery status.

The battery voltage is monitored and data logged for 24 hours. The operating profile of the street lighting is shown below.

Solar Lamp Powered by 3 AA Rechargable Batteries

In addition, we have installed two small solar lamps in the toilets behind the Guard House. This gives the staff lights at night when they use the toilet.
Each lamp gives 1 Watt of LED lights, powered by 3 AA rechargable batteries and a 3 Watt solar panel (9Vdc @ 300mA). This gives about 5 hours of lights everynight. Estimated cost is Solar Panel ($9), Box & LEDs ($10), 3 AA Batteries ($15) and Switch & Wires ($2) = $36.