Voici la question qui me guide dans mes recherches...

L’appât du gain manifesté par les entreprises supranationales et certains groupes oligarchiques, de même que le contrôle des ressources naturelles par ceux-ci, dirigent l’humanité vers un nouvel ordre mondial de type féodal, voir même sa perte. Confronté à cette situation, l’être humain est invité à refuser d’accepter d’emblée une pseudo-vérité véhiculée par des médias peut-être à la solde de ces entreprises et groupes. Au contraire, il est invité à s’engager dans un processus de discernement et conscientisation afin de créer sa propre vérité par la confrontation de sa réalité nécessairement subjective à des données objectives, telles que révélées par la science, par exemple.

The penalty that good men pay for not being interested in politics is to be governed by men worse than themselves. - Plato

dimanche 3 janvier 2016

How to calculate solar power for Canada.

Taking a course on energy on Coursera.  I stumble on this Canadien web site:


Where you can find the number of kWh yearly average per kW of solar panel installed.

The FAQ page explains the calculation:

1. What does photovoltaic (PV) potential mean and what do the units kWh/kW refer to?
The PV potential values give a simple estimate of how much AC electricity in kilowatt-hours (kWh) is expected to be generated by a typical grid-connected photovoltaic system without batteries per unit of photovoltaic system rated DC power in kilowatts (kW) at Standard Test Conditions (STC). The STC rated power of a PV system is the total rated DC power at STC of all the photovoltaic modules in the PV system. Standard Test Conditions are: 1000 W/m² irradiance with normal incidence, 25°C module temperature, air mass 1.5. PV potential values are given as totals per month or per year, and represent an estimated average yield over the lifetime of a typical PV system. As an example, if the annual PV potential at a given location is 1150 kWh/kW, this indicates that for a system with a rated STC power of 3 kW, annual electricity production should be approximately 1150 kWh/kW*3 kW=3450 kWh. More about the methodology that was used to estimate PV potential is explained here.

So for my location, the early average if the panels are tilted to my latitude (optimal), I get around 1200kWh/kW.  So if I install this panel of 140W (cost around 300$), I will get:
1200*(140/1000) = 168kWh per year.  Divide this by 365 days and 24h, this give 19.2WattsHr in average over the year for this 140W panel... or 19.2/140*100 = 13.6% capacity factor.

So my 140W panel, gives me a early average of 19.2W.  If I need to power and average house in Canada, which is 12,000kWh/year, this is around 1.4kWh.  So I would need 1400W/19.2W = around 73 panels of 140W or around 22,000$ just for the panels, without counting the batteries and installation. 

I would also need a lot of space!  Around 850 square foot or around 30 foot x 30 foot of south facing space. And I would need to clear the snow of those panels during 3-4 months.

In Quebec, I spend less than 4000$ per year on electricity (I burn wood during winter time).  So to pay for the panels only, it would be 5.5 years of return... With the whole cost, installation, batteries, we can easily double that number to around 10 years.

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