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At Zorays Solar Pakistan, profitbilty of your PV Solar Solution is calculated in terms of quickest payback and long lasting solutions with minimal operations and maintenance cost.

  1. Pay back calculations are performed in the worst case scenarios with 320 sunny days averaged out for Pakistan.
  2. The peak insolation time for optimum sun to strike solar in Pakistan with an irradiance of at least 1000 W/m^2 is averaged to be about 6 hours 45 minutes.
  3. The average differential rate for electricity applied is @ Rs. 12.33 per unit.
  4. In case, you submit us with your current electricity bill, it is normalized with yearly average taken from our very own consumer behavior studies meaning 8 hours of operation for all said load to get the best estimates on what Energy Load Profile are we talking about.

This is because of the fill factor of a panel. Fill factor is merely the ratio of actual power genration to the theoratical. In understanding this more thoroughly, you have a 1 meter squared panel area shone with 100 W / meter squared light irriadiance, at 20 per cent panel efficiency (hypothetically, and rarely the case in commercial solar panels), your panels shall generate 20 W only. Uptil now we havent included the system transmission losses in DC cables and your inverter’s efficiency. Also to consider is the solar panel angle in Pakistan and Azimuth for a fixed solar mounting structure. Hence, the summer load or winter load profile is off essence.

To bridge demand and supply gap, Zorays Solar Pakistan energy consultants rather takes it as an energy conservation strategy and optimizes’ its clients solar system with certain expansion factor, which may seem to be increasing the upfront cost for them. But any AC bypass (in the normal so-called UPS mode, where WAPDA is taken in to fulfill the deficit) is costing you extra money otherwise. This way pay back is controlled with proper design strategies and the solar system in Pakistan price is adjusted.

Related: Frequency of AC in Pakistan

Next factor in line is if you take Solar Energy System as an alternate backup resource. Good news is that you can still achieve better efficiency conversions than a so-called Modiefied Sine Wave Inverter UPS than with Pure Sine Wave Inverters that are commonly used alongside solar charge controllers to be called in totality as Solar Inverters. One factual reason behind is the improved power factors in the latter. Almost 0.6 for a Modified UPS to somewhat 0.85 in a modern day Solar Inverter.

Kindly do not misunderstand power factor as a conversion efficiency but as the capacity of the inverter to withstand reactive power such as inductive motors and fans. Unfortunalely, so-called renewable energy companies in Pakistan do not calculate the load reactive power profile and would be stupid enough to suggest a Power Factor the inverter to recommend as if all your load was pure resistive and could be run. Huh!

Emperically, Zorays Solar has confirmed that to every 1 unit that needs to be regenrated from DC Voltage stored in batteries into available AC output, a conventional UPS uses 1.86 to 2.02. This again to the fact, how well does the inverter simulates into a sine wave. In case of Solar Inverters, the signal resemblance to a pure sine is enhanced and very little power is lost in harmonics which other energy companies in Pakistan do not cater to.

To say the least, a modern day Solar inverter shall infact take upto equivalent of 1.14 unit to create an effect of 1 energy unit. This way, had we designed your system we shall reduce any chances of charging through WAPDA utility and shall utillize an approriately set expansion in number of panels to give you an effect of multiple hour FREE SOLAR backup. At the same time, there is a fixed 10 Rs per kilo Watt Hour netmetering tarrif allowed after successful application for excess electricity bill.

As soon as the first pay back is achieved, you are effectively looking at a future where the batteries replacement cost and operation and maintenance costs at max (0.025% of your quotation cost per annum) shall still be repaid by FREE Energy for the next 16–22 years. A lot many solar power companies in Pakistan, do not give you awareness about the performance depreciation curves and would generally say that the technology runs for 25 year with guarantee at the nominal rated power. Which is never the case. We use premium softwares like PV Syst or PV Sol to ascertain depreciation and deliver accordingly oblidged under a Service Level Agreement.

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The pictures used are credited to Ms. Ayah Alfawaris (The Lady Solar) from around the internet with prior permission.