His calculation is confusing.   What does this mean --> 3.5kWh/kw ?

Than it should be 3.5kwh/kwp? But is it accurate?

He have 7.7kw panel and base on 3.5hr sunlight, able to generate 27kwh ? That is 100% efficiency?

It is well worth to research in the modules that you are selecting. Having said that there are only 2 locally manufactured Si modules that i see trusted. One being q-cells, the other is MSR. I do not know if Panasonic started to sell locally (Plant in Kulim). Maybe others could share other supplier that could obtain the RM0.03 cent adder.

The other factor I believe good customer support for warranty claim. As it is standard module will have the performance warranty:25yrs. 90% - 1st 10yrs, 80% - next 15 yrs. So at least supplier can swap any defect modules/complain fast.

Actually the main killer in Si modules are the heat from the roof. Commercial projects i.e warehouses, system are design with a lot of clearance from the actual roof. Most will degrade at a rate of -0.4% per degree raised.

This year sharp came out the highest efficient panel which I think will take few more years to go into production.

http://inhabitat.com/sharp-breaks-its-own-...ent-solar-cell/

Personally, I have come across generation performance for QCell(mono), Panasonic(mono), Yingli(poly), BYD(poly) and CNPV(poly)
All have similar capacity (240-245W) and ordinary panel (not HIT, n-type mono)
Guess what? All have same performance. The difference is minimum.

My experience above is based on actual performance in Malaysia. No investigation involved, just compare generation data.

I have not come across any Sunpower panel yet. (I'm in doubt. Any guys want to bring in Sunpower?) Sunpower is expensive brand. E20 series is high efficiency panel. Each solar panel company has high efficiency panel for showcase and Malaysian SP don't use them. The pricing is not justify when compare to ordinary panel. I haven't meet any Panasonic HIT or Yingli Panda in Malaysia.

In case, you want to investigate, I suggest you to look for "Temperature Coefficient of Pmax". The lower the better. This is the measure of performance drop when panel working at temperature higher than 25deg C.

The e-series that you mentioned is 96 cells configuration so you must then compare the same size/configuration.

I have attached a simple summary. In general a lot of manufacturer have 6x10 cells as standard. For this case I could not find for Sunpower and Panasonic.

In short conclusion between Sunpower,Q-Cells,Panasonic:
1. Highest output module: Sunpower at 327Wp.
2. Highest output per cell: Q-Cells at 4.5W/cell.
3. Lowest heat coefficient: Panasonic at -0.3%/deg C.

You must know the cost RM/Wp as this is how modules are sold. In the end it depends the whole system cost and your assume ROI.

It seemed there is a lot of taker for solar right now. Around 790kW was taken up in 24 hrs.

You are using Sunpower Panels ?