A 7.7kw sytem generate 3.5kw is about 46% output. That is not even half of the 7.7kw. The malaysia weather problem or the panel quality? Do you have a similiar panel and system to compare?

A 7.7kw system should generate 7.7kw/h in theory. If base on your total a day generate 27kwh and 5hr of sunlight, average your system can produce 27/5 = 5.4kw/h. That is 70% efficeincy. It is average panel efficiency. While some claim can go as faf as 80%. Or 6.1kw/h.

But if base on your 3.5kwh and total generate perday is 27kwh, it mean 27/3.5 = 7.7hr sunlight?

But if base on your said 3.5 good sunlight hr and 3.5kwh/kw max generate. That is 3.5hr x 3.5kw = 12.25kwh for whole day. That is not mre than 50% of your system efficiency.

Probably another thing I suspect is the half of your panel is not perform max efficency. Since half is facing north and half is facing south.

Yes. That is half yrs sun facing south and half yrs facing north. My house front is facing north. While my house right side is facing east. So I always see the sun half yrs is slighty infront my rooftop and later half yrs is slighty behind my rooftop.

Last week have some free time and since this few day super hot sun. So decide to do some research on my solar panel. See what it can output.

Have been keep in my store room for over a year now. Lazy to setup on the roof. And yet decide On Grid or OFF Grid.



So take 2pcs out to try. When fully roll out, it damn long. The size is 5486mm x 394mm x 4mm.



When empty run without hook to anything, the voltage read at 45vdc. Not bad with some shading on the panel. The actual spec for this panel is 111watt, 33vdc. (24vdc) Confirm the panel is working good.



Than hook up with a big cable (4mm) in parallel connection. This will give out 33vdc, 200watt.



This is a grid tie inverter which convert the dc voltage to 240vac. Max it can output is 500watt. This china made inverter is not that efficiency.



After switch on the inverter and connect to 3pin socket, it running without any problem. First it will detect the home voltage and hz. Than adjust accordingly. There is a led light running up/down to show the panel is outputting some current. If the panel output low, the run led will slow down. When no output during night, the inverter will shutdown. It can be run 24/7 without off it.



Sorry for that damn watt meter. The LCD screen got some problem with some line missing. Use not more than a year than become like that. China made. Can't complain much. At max sunlight, I figure out it probably run at 160watt ++. The pattern of the watt output is gradually up from the morning. Than go down gradually in the evening.



From the testing, 1 day probably can't get even 1kwh from 111wx2 panel. That is about 72% output. It is not that accurate from this testing as

1) many shadow around when place on the floor. Rooftop probably can get better yield.
2) since it on the ground, the sun angle is not optimize. The panel can't get enough sunlight.
3) can't read the broken LCD watt meter.

Probably will conduct another testing after get a new watt meter. :)

Not cheap lah. Don't even think of powerup an aircon. The output is not stable. once crowd over your panel, your aircon will down. 1 battery can cost you rm800+. The best is supply back to TNB. That is the cheapest setup.

You don't need license. And it is not illegal also. The different is, those proper setup and sell back can get higher rate. While this individual setup will only get you a normal rate 0.218. Probably consider as subsidy your bill.

2 panel and a inverter around rm2500.

No need special meter. The current meter will do. Either it will slow down or rev if output more than input.

It is easy DIY. A panel, wire, inverter and a watt meter. Hook it up and plug into any 3pin socket.

Good is, you can gradually increase the panel if you like. Or charge a battery if you don't like to give to TNB. Or when you have finally get a system big enough, get a provider to apply for you a license 1 that give you a higher rate return.

For panel, if you add more later, make sure the voltage don't different much with the old panel. Do the research what is the common voltage panel have in the market.

Don't get those crap china panel which perform low output. Waste your rooftop space.

From US. Get it during sale and using another cheaper shipping way. The brand is unisolar. As you can see it come in roll flexible. Advantage is, it lighter compare fix panel type. Reduce the shipping cost.

But this company bankrupt liau. maybe still got some provider stock this kind of panel.

Since the panel cost getting lower, maybe can get more watt/$ now.

It is a thin film type. Not really less efficiency.

The best working condition for solar panel is clear sky with no crowd. And cool weather. This 2 condition is not favor here. We are crowdy and hot weather here.

Normal panel/poly crystal will reduce efficiency once get hot. And when shadow cover even less than half the panel, the voltage will drop.

While thin film, is not effect much by hot weather. And shadow will not cause the voltage drop. Thin film panel actually is more suitable here.

But disadvantage for thin film is, it need more space per watt compare normal panel. That's why you see the panel is freaking long.

As the poly panel getting lower cost now and need less space per watt, more people are using poly panel to offset the loss. You buy more panel to cover back the loss of the efficiency.

Since here getting more company sale panel, better try local first. I think price is getting cheap here. The problem is are they import good panel or china b grade panel. Will they just sale 1 or 2 panel to you.

I've brought 2x from US. Include some others item too. So far no tax. Using special way.

If you talking about the space, yes. It require more space perwatt.

But if I will buy another batch of panel, I will looking for thin film multicrystalline panel again. If my budget have lah. It is the highest efficeincy panel in the world. Do you believe that?

Maybe you can check it out with Panasonic here. Would they sell their panel here. The panel probably maufacturing in Kulim. Or you bring a lorry to there at night.

Panasonic have the most efficeincy panel in the world. It is a thin film multicrytaline type panel. Call Panasonic HIT solar panel.

No need large scale lah. Just buy 1pcs. But don't no they will serve you or not.

Dont forget the hot temperature and shadow.

How to said, in term of technical, thin film yield more output than poly. Put it into actual situation like sun, hot weather and crowd shadow, thin film have more output. If you put poly and thin film with same watt to test, thin film will yield more output than the poly panel. Another is, thin film panel will still give out output even 1 of it cell is damage. But not poly panel.

But in economy term, poly panel is cheaper. So you can put more panel to output same as thin film. Since poly panel require smaller size. It somekind of offset.

So in real world, lower cost is a winner. That is why you see more poly panel than the thin film panel.

If you don't mind the cost, than look at the Panasonic HIT panel. It is a thin film hybrid panel which is the most efficiency panel now.

http://panasonic.net/energy/solar/hit/

What is the interest rate?

Today passby this electrical shop and saw some interesting solar panel and gadget display outside. So go and take a look. Locate at sitiawan town, perak. Sell a lot of china made gadget like led light, solar stuff, electrical applicance, switch, light etc. Their main is those house electrical mcb, elcb, wire, trunking etc. Quite interesting.

Price reasonable and not expensive. Example the front shop display solar panel 100w 12v cost rm700+. It is a market price. They do have 20w, 10w etc panel. But not sure what is the grade of the panel. Or a set of spotlight with battery and panel cost rm290+. All china mari. The bos also very friendly and intruduce everything he have.

Not really a good rate. The rate is about 86% of the borrowing money.

Not sure where is your area. You can get this stuff locally. You need to get a panel, charger, battery and inverter. Not difficult to setup. But at least get the shop guy to teach you how to hook it up.

At least 100watt or more.