What you want it for?

It only have 70w inverter capacity. Mean you only can connect thing output not more than 70w. But it don't come with a battery. It is optional and plug in.

You mean this is useless? What you want something to power your aircond 24/7?

If you mean for power a aircon, yes. It is useless. Even you use 20set of this, it still can't run a aircon.

Forget it if use solar to power a aircon. It cost you a bom.

Let say a 1hp aircon (750w) to run on solar. You need

1) 2kw of panel. If 1panel is 100w, you need 20panel.
2) 1150Ahr of battery to run on night time. (8hr runtime) If the battery is 100Ahr capacity, You need 12set.
3) 1.5kw-2kw of inverter to convert to 230V.

Prepare at least RM30k for this setup. That enough to turn you off?

You missed the sarcasm

you must be good with maths.

I take that as a teasing.

Frankly speaking, I m sucks at maths.

Battery are the cost killer, don't forget you need thick wires because of the high current.

Go for 24v or 48v lor. That can reduce the size to twice or trice. But still can't beat the AC wire cost.

Sometime very hard to decide between 12v and 24v. Between cost and available parts in the market.

12v are more common, but you need cables that can handle 200 - 300Amps minimal that is using welding cables.

That is why I always facing this problem. Many thing that is cheaper are in 12v. But draw more current and cable cost if using something bigger.

Industrial largely are using 24v. But industrial parts generally is expensive.

The only way I think of, design it to run 24v. Step down if require 12v. That is extra cost on the step down component and lost in efficiency. Hope offset from the cable and others cost.

from what i can see, self use power generation is not viable. TNB's electricity is cheap, and makes it not worth our while (commercially) to buy and do a solar system.

Only if you are a prepper or want a back-up system (in which case, you'd use a diesel set) or have a lot of money.

Conversely, solar for SEDA's FIT is quite profitable.

What is the annual income percentage?

Return on asset in mid to low -teens (depending if you know where to get cheap n good system). With debt, effective return higher.

What is your annual income from the investment ?

If I put it at low -teens, it is about 4%.

If you buy me coffee, i'll tell you more :-)

Otherwise, i'll be very happy for others to think as you think ie single digit returns. Not enough FIT quota these days.

Hi guys,

Been thinking of exploring solar lately but I really suck at the math. If I have a 50w panel, does it mean I can power a 50w/hour device? And then to power at night depends on the size of the battery correct? How to calculate this?

Also, any idea on on-grid system? Can we diy or must we get tnb approval?

Thanks

No problem. I m coffee lover.

I m not really interesting in FIT. I don't have the space and the cash.

Only interesting how much it can generate. Compare others investment. Probably when retired, can invest on it for a solar farm.

A 50w panel can generate 50w of power in 1hr. So if you expose the panel in whole day, it can generate 50Wx 5hr=250whr of power. But this is just a theory calculation. Not yet minus some bad thing.

You need to know your device usage. Than you can know the panel can support or not. Let say your device suck 20w and you want to use 10hr. That is 20wx10hr=200whr. So it is under 250whr panel. Your device are good to go.

For battery is a bit complicated.

For on-grid, you need get a approving installer. Can't DIY. Just only the document, can kill you.

Ok, basics ; revenue = price x quantity


Price for this years commssioning is about rm1.21/kwh
Quantity is 3.5 hours (klang valley avg) x 4 (say a 4kw system) x 31 days

Multiply it out and that is your revenue.

I understand this calculation. But this is just a theory.

Want the actual annual profit. What is the percentage like. I dumb RM100k in, what annual income I get. 4%, 5% ?