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Yanuca Island School  (2405 Suva)

About

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Specifications

Works & Maintenance

CO2 & $s

Contacts

Charge data

Term Reports

Procedures

About

Yanuca Island (near the larger Beqa Island) has a primary school where 5 teachers hold classes for 55 students ranging from kindergarten to year 8.

The school had a small two panel solar system, servicing the office only - it functioned well on sunny days and lasts a short period in the evenings (as the batteries are coming to end of life). This is supplemented by a small portable generator. Wiring was non-existent in most areas of the school and in others was old and unsafe - so all buildings were rewired for the new solar. The small solar system is redeployed to the village hall.

A donor also supplied a new LED data projector and 20 kgs of library books focused on sustainability.

School Role & Facilities
Students:
Teachers:
Classrooms:
Kindergarten:
Offices:
Library/computer area:
Teachers homes in the school grounds:
Boarders (live-in students):
Hostels (Boarding houses):
Dining rooms:
Date entered:
Project Funding

Donor - Anonymous

Our school commits to have a group of students spend at least 15 minutes, most weeks, picking up plastics. So, we keep our small patch on the earth as free of plastic as possible - its a small action we do to protect marine and other wildlife. We hope all schools in the world join us in doing the same.

Carbon Dioxide and Financial Savings
Document
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Yanuca Island School

Annual school fuel saving (litres) (1)

100

Annual fuel saving 5 teachers' homes getting solar (litres) (2)

250

Annual cartage saving (litres) (3)

15

Total annual fuel saving (litres) (4)

365

Fuel saving over 30 years (litres)

10,950

Annual CO2 saving (kgs)

930

CO2 saving over 30 years (kgs)

27,922

Annual AUD saving (8)

$ 1,730

Annual USD saving

$ 1,176

Annual FJD saving

$ 2,595

30 yrs AUD saving

$ 51,900

30 yrs USD saving

$ 35,280

30 yrs FJD saving

$ 77,850

Total of All It's Time Solar Schools

Total annual school fuel saving (litres)

21,580

Total annual fuel saving 94 teachers' homes getting solar (litres)

4,300

Total annual cartage saving (litres)

3,289

Total annual fuel saving (litres) (4)

29,169

Total fuel saving over 30 years (litres)

875,070

Total annual CO2 saving (kgs)

74,373

Total CO2 saving over 30 years (kgs)

2,231,424

Total annual AUD saving (8)

$ 82,738

Total annual USD saving

$ 56,253

Total annual FJD saving

$ 124,107

Total 30 yrs AUD saving

$ 2,482,140

Total 30 yrs USD saving

$ 1,687,590

Total 30 yrs FJD saving

$ 3,723,210

Assumptions

Fuel cost in the islands in AUD/litre (5)

2.00

Fuel cartage consideration % (3)

0.15

Annual fuel consumption per teacher's home wired (litres) (2)

50.00

Annual generator maintenance consideration AUD (6)

1500.00

CO2 produced per litre of fuel burned (kgs) (7)

2.55

AUD to USD conversion rate used

0.68

AUD to FJD conversion rate used

1.50

Notes

(1) This is the annual fuel consumption based on reporting from the school at the time of school survey and affirmed at the time of installation. It refers to direct fuel use by the school, not including teachers' homes.

(2) The fuel consumption of teachers' homes varies considerable between homes and over time. Their sources of energy varies from their own small generators to shared generators, still some use kerosene for lighting and some small solar (often failing) for lights and charging. Recently on Beqa Island two of the 7 households at one school were each using 10 litres of fuel per week and some were using very little. So, we have chosen the conservative underestimate of each household saving of 2 litres per week (approx. 5 kgs of CO2).

(3) Most schools have a cost to get fuel to the school - usually small boats and car/truck on the mainland. The costs vary from small amounts to some schools where the cartage cost is almost the same as the cost of the fuel itself. The cartage consideration (dollar and carbon cost) is a percentage of the total fuel consumption, because it varies widely from school to school we have chosen quite a conservative estimate.

(4) Includes cartage and teachers' home consumption estimate that therefore contribute to the total CO2 saving. But we do not include the teachers home in the financial saving - rather we just refer to the savings from the school generator.

(5) This is the current published diesel price in Fiji presented in AUD. Often the islands pay a higher price, but that is not factored in, so generally the price will be a small under estimation.

(6) Generators often require repairs and eventually replacement. That cost varies significantly from school to school, so a conservative value is applied to represent this component of cost/saving for all schools. It is not possible to calculate that accurately for every school, hence the estimate across all.

(7) Burning diesel produces CO2 at a rate of 2.68 kgs/litre, whereas petrol produces it at a rate of 2.31 kgs/litre. We have chosen 2.55 as the approximate for our calculations because there is more diesel used than petrol in the school generators.

(8) The fuel savings in the teachers' homes are not included in the calculation of financial savings for the school. Although teachers are asked to make a small contribution each term (FJD70) for their now 24-hour power and this goes to the school to buy more education resources.

Specifications
Document
17 May 2023

DC Coupled

Inverters

Inverter type

Victron MultiPlus-II/5000

Charge controller

Victron MPPT 250/85

Panels

Panel type

Jinko Tiger 415

Number of panels

12

Array (watts)

4980

Mountings

Mountings

Roof mounted

Brand

Clenergy PV-ezRACK Solar Roof

Batteries

Battery type

Simpliphi PHI 3.8 Lithium Ferro Phosphate

Number of batteries

5

Kilowatt hours

19.0

Batteries mounted

Simpliphi Boss 6 Cabinet


General electrical works

The classrooms, office and library areas have been rewired. The homes do have small two panel systems that are reasonably functional for charging and lights and supplemented by kerosene lanterns. Considering the short expected battery life of those systems, a 250m new circuit now connects the school solar system to 5 teachers’ homes that have all received new LED lighting and power sockets.

4 amp breakers are installed into the teachers' homes - this limits appliances to a maximum 960 watts and capacity to use modest sized electrical appliances, but not electric cook tops etc. That power limiting strategy means effective use of a reasonably sized school solar system and all in the school community are very happy to have this balanced level of 24-hour power supply.


Partners

Solar contractor

CBS Power Solutions

General electric works constractor

CBS Power Solutions


Contacts
Document
First Name Last Name Position Phone Email FB Note Edited
Note
Charge data
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  Event

Works & Maintenance
Document
Term Report