Will finish by today in next few hours

Actually what is the limit of a single phase PV system?  Some said can go 7kWp, some said max 6kWp ?

but my neighbor install 22 pieces with 620w per piece which generate 13640w then it is illegal?

not only that. you get 5 years of solar insurance... I had to get my own, every year.

and 5 years of operations and maintenance... that is another couple of  thousands.

and honestly the price is way way lower than what I got when installed 4 months ago, even though mine is 16.8kwp - 12kwAc.
btw microinverter sounds really good.

anyhow, not sure how bad other solar user's generation is for November... but it is below 25% below the good months. Meaning usually if 50kWh per day... now only 38kwh.

What difference in consideration if house is single or 3 phase?

Ranau is sensationalised news, 3 guys was installing solar lamp

Dear Sifu,

what is the efficient rate we should be getting?
i just run my solar for second day, and i notice the max i get is just 70%.
i install 4.88 and currently getting peak @ 3.64 @ 11:28am.

dear sifu, need some advise here
i'm currently looking to setup solar, bill at 600 per month, and planning to get an EV car probably in a year or two
house facing west, roof top deck slanted and will be facing east if panel is install at the roof deck, issue is that behind my house, there's a high rise which will be causing significant shadow during morning until noon
is this still viable for solar consideration?
or better off to extend my car porch front and install solar on top, since i'm facing west, and there's no blocking on that view

My house facing west, if I were to have the solar on the extended porch, it won’t be blocked after 12pm and will have sun till sunset since there’s nothing blocking infront

However if I were to install on existing roof, I will be blocked by behind high rise (> 30 level) + the roof angle facing more of east a little, so it will get sun only from 12pm - 5pm? Probably during the sunset time, due angle of the roof, another shading may occur 🤔

Although the strongest solar generation are generally from 12pm onwards, morning to afternoon lighting still contribute substantial solar power. Generally shading can halves your solar generation. Now you calculate whether the money spend installing the solar vs estimated solar generation (generally calculated 20% less than what is quoted by installer, and in your case, might even need to reduce to 50% of expected generation). Then you see worth it or not. My own one takes about 6-7 years for ROI that is based on the quoted -20% rate. Now, my roof are having many triangles and there might be some minor shading, it can drop further to 8 years for ROI....

Might not even be worth it but already installed and December is not a good example for average solar generation per month due to many cloudy and rainy days vs the rest of the years.

Should be giving 880kwh but only 6xx, due to bad weather?

2k is rated design spec...

usually can go a bit higher or lower... design tolerance

for non critical items ±10% is not unusual...

like our ac power.... 210 - 250v...

some equipment is 220v others 230v... etc.

Most of the time u will get these kind of outputs so oversizing the inverter is a waste of money

1-2 days ago... someone say wasted 1.4 kwp bcoz clipping...

if oversize and say can recover 2 hrs per day, 2.8 kwh * 22 sen/kwh = 0.616...

1100 / 0.616 / 365 = 4.9 yrs to roi...

current bro clipping only 0.6 kwp... so > 10 yrs to roi

extra panel... 0.61 kwp  * 1.6 sunhr... also > 10 yrs roi

so depends on how bad clipping n oversizing cost... most cases is bad for roi...

because most ppl roof not flat... panels not pointing to the sun at 1pm...

depending on roof set up... peak power generation is spread or skewed to the left and/or right side of the bell curve already... clipping will take place but you won't get to see a nice flat top like in the pictures...

I just did a rough calculation. At the current tariff of RM 0.218 for the first 200 kWh and RM 0.334 for the next 100 kWh, it costs RM 77 a month or RM 924/year for the first 300 kWh.

Let's assume it costs RM3k to add an extra 1kWp to your system. With an assumption of 3h peak sun, 1kWp generates 90 kWh per month. You'll need an extra 3.3kWp at the cost of RM10k to generate that extra 300 kWh.

That extra RM10k only saves you RM924/year so the ROI is over 10 years.

Hmm... I just try to work on the math problem.
Assuming a 5kw system produce = 450kwh (5kw x 3sun hour x 30 days) while a 7.2kw system produce 648kwh
Assuming your monthly usage is 750kwh (so you want your original 5kw solar power system to offset the higher tier and left you with 300kwh lower tier), in ringgit, your 750kwh cost RM320.25 (bill calculator from https://myelectricitybill.my/bill_calculator_domestic.html).
With a 5kw solar system, your usage will be 300kwh costing RM71
With a 7.2kw solar system, your usage will be 102kwh costing Rm20.20, so difference is Rm50.8 extra savings per month
So you spend additional 3k  for the system

Rm3000/50.8 = 59months = about 5 years

For a 5kw system, your monthly saving is RM249.25. The ROI is obtained after 20000/249.25 = 80.24months = 6.69months
For a 7kw system, your monthly saving is RM300.05. The ROI is obtained after 23000/300.05 = 76.65months = 6.39months (THIS)

So in short, for your system, it is better to get the higher capacity system because
Cost to generate 1kw in 5kw system is 20000/450kw = Rm44.4 per kw
Cost to generate 1kw in 7.2kw system is 23000/648kw = Rm35.49 per kw

In this particular case, it makes sense to go for the higher kwp because the extra 2.2 kwp is just RM3k. I would say the quote for the 5kwp system is on the high side at 4k per kwp hence the longer roi.

Anyone else final bill before NEM get charged 8% tax for all?

1-600kwh should be tax free. Only 601 and above get charged 8%.

Meaning I was charged 8% for 1-600kwh as well.