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 Home solar 4 months in.

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bee88
post Oct 3 2023, 03:56 PM

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QUOTE(Drian @ Oct 3 2023, 03:43 PM)
It is just wiring. The old system can use string while the new panels uses micro. Why do you say it is a new system?
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Coz u need totally new set of wiring? So if u install a micro on top of string, there is nothing that you can use back. It’s like new installation.

And u need a new db and such. That’s what I mean a total new system. It is not like u can connect both together.
bee88
post Oct 3 2023, 03:57 PM

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QUOTE(Choongster @ Oct 3 2023, 03:50 PM)
install solar but no battery ? then install solar for sunny day use ?
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Coz Tnb grid become our “battery”
bee88
post Oct 3 2023, 03:58 PM

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QUOTE(yhtan @ Oct 3 2023, 03:56 PM)
This kind very easy kantoi wor if kena TNB spot check, which is why it is very risky.
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They say if u not on when spot check, most likely can escape.
bee88
post Oct 3 2023, 04:02 PM

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QUOTE(fadzly @ Oct 3 2023, 03:49 PM)
6ppl 800 ringgit is alot. But my family got 7 also reach 500. Three airconds too. But to get 50 ringgit bill after installing that many solar, i think its not worth it.
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If you have 500 ringgit bill consistent, it’s very worth to venture to solar. The general consensus is above 400 it’s super worth to install.

With the right system, roi is below 60 months with no upfront deposit whatsoever. And bill will drop to tm3.

Basically you are just channeling money paid to Tnb to buy a system that belongs to you. U still get to enjoy the electricity as as much as usual and only pay rm3 to Tnb. Ur rm500 will go to ur system for about 60 months. After that alll free electricity. If u don’t do solar, u will channel 120 months of rm500 to Tnb just to use and get nothing back.


bee88
post Oct 3 2023, 04:12 PM

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QUOTE(netflix2019 @ Oct 3 2023, 04:08 PM)
Lol don't know why u make it so complicated.
Based on my bill I calculated 20% p.a return for 47k invested.

Epf is 5.5% average.

The only difference is solar panel is physical asset 47k cannot take out but much better return hence the ROI 5 years. Anyway the risk of losing it all is offset by the warranty given.

Epf u can take out but 5.5% p.a. also I already maxing out my epf contribution. I just put 1 year of my epf investment into solar.
Yep. I did just that. The electrician who ahem for me came bc and adjust back. Fucker didn't even bother to replace the sticker. So far haven't kena lawyer letter. Can only pray to God everyday now.

Funny enough before they start change meter I contemplated to burn it and ask for replacement. The guilt and anxiety very overwhelming to me. Very not worth to curi electric

Generally bill below rm400 not worth. The inverter and stuff like that cost significant chunk of the 47k I paid. Also need 3 phase power.
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I have a few friends installing system for 250-300. Their roi is about 70 months. Slightly worse. But for me, I see this is a chance to convert the Tnb bill payment into a system that cna be used for long term. So depend on what you are looking at.

With solar system can be use for 20-30 years, long term still worth la. But roi is affected a bit.
bee88
post Oct 3 2023, 05:11 PM

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QUOTE(razr_sped @ Oct 3 2023, 04:37 PM)
just to share mine, 800kwh average monthly usage which is RM341 per tnb calculator. Installed a 7.6kwp system for around 28k, using huawei invertor which after NEM could install with its battery system of up to 15kw. Current bill average around rm40, but my petrol bill also went down a bit as I had a phev after solar installation.

No upfront cost but i took EPP for 24month. If the tariff increased in coming budget, then the ROI could be shorter or would be less affected. Main target is to get the bill to using only subsidize rate as i don't see a point to not utilize it, but on top of that I can utilize AC as needed esp. on hot days. Currently I have a 2.5hp running from 8pm - 6am daily.

Quoting from earlier comments, these are money need to be spent anyway to TNB, must as well do something to it and in future get a minor battery for backup in the event of power failure. So, if purely numbers it doesnt make sense, but i'm not good with finance tongue.gif

user posted image
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Is May your highest yield with 766kwh? That is about 24.70kwh and 3.25 sun hour.

I feel like ur system should have performed better. Something wrong? At least 800 based on 30 days and average 3.5 sun hour.

bee88
post Oct 3 2023, 05:23 PM

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QUOTE(netflix2019 @ Oct 3 2023, 05:19 PM)
Actually toward the end the supplier hinted to me they can install extra panel than allowed by TNB, under table stuff. I never ask further since not possible for my case.

I think the main point to be considered. Are u going to shift new house in the next 10-20 years? Is the upfront cost going to affect ur lifestyle. I definitely don't which the biggest reason i go all in for solar.
Hmm... why the need for battery when u already have NEM? How much the battery cost and how many panel? Can last for whole night?
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For your case, if your panel already oversized now, which it often does, dont bother to add pnel without upgrading ur central inverter.

Your central inverter already function at the max capacity at certain time.
bee88
post Oct 3 2023, 05:29 PM

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QUOTE(Drian @ Oct 3 2023, 05:26 PM)
What is the huawei inverter specs?

Are they undersizing it.
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From my observation, could be one of the reason.
bee88
post Oct 3 2023, 05:38 PM

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QUOTE(razr_sped @ Oct 3 2023, 05:30 PM)
roof angle i supposed as I'm facing east-west orientation, so in the morning rear is angle directly which make peak power but the front is facing to north rather than west which lowered the performance it seems.
my supplier said the same too on additional panel later, but my idea is to see when/what is available then. I see this a 15yr cycle so maybe that time got better gears to upgrade and incentive given.

NEM doesn't allow battery, but its mainly the idea for selco after NEM ends, not now to power the house. but currently i do have those smaller battery for camping use.
i manage to get the 9kwp one
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You mean your inverter is 9kwac? This spec pair with 7.6kwp seems unbelievable.

Just heads up. You need to share the mode of the inverter.

Coz when you mention 9kwp inverter, I suspect you are getting the inverter that support up to 9kwp. But usually the kwac is around 6-7.

It’s best u can share the model.

To be honest, if you roof has angles, should have gone for micro inverter.

Yours come with optimizer?
bee88
post Oct 3 2023, 05:43 PM

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QUOTE(billyboy @ Oct 3 2023, 05:41 PM)
once smart meter installed, gg  cool2.gif
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Rm80 is possible if he only has aircond for 2 -4 hours a day.

If the house has a small fridge and nothing else, it’s quite possible.
bee88
post Oct 3 2023, 05:49 PM

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QUOTE(razr_sped @ Oct 3 2023, 05:46 PM)
i just reread the spec for sun2000-6ktl-m1, 9k kwp in, 6k out so i guess you r right on undersize inverter.
well, there is a lot of should have
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So the idea of adding panel is actually pointless

And your yield is limited by the inverter. Not so much panel placement.

Panel placement usually can’t do much because that’s something the roof you can’t simply change when u are using alll of it.

I hope your system comes with optimizer?
bee88
post Oct 3 2023, 05:53 PM

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QUOTE(netflix2019 @ Oct 3 2023, 05:46 PM)
user posted image

Klang.
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Your system looks okay abit. 3.4.

But to be honest, you won’t know unless you have friend in the same area to compare.

U might think 3.4 is good, until u find out actually could be 3.6 or 3.7

So be a clever consumer. Share data to ensure u are not cheated by the installer.

Sometimes installer just say sun problem. When there are many other factor that they didn’t tel you.
bee88
post Oct 3 2023, 06:10 PM

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QUOTE(netflix2019 @ Oct 3 2023, 05:46 PM)
user posted image
user posted image

Klang.
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My friend in klang near Aeon klang is 3.468 sun hour.

735.6kwh
System is 7.07

Another klang friend is 3.548 sun hour.

537.58kwh
System is 5.05.

Both are sept value.

So you can roughly know. I am not sure if the area aeon klang near u, but my friends live there.

Your system looks within the range despite lowest sun hour. If u get 3 sun hour but others 3.5. Then something wrong already.
bee88
post Oct 3 2023, 06:14 PM

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QUOTE(razr_sped @ Oct 3 2023, 06:11 PM)
could be, but my roof angle and orientation means one string is not getting full sun shine for first half of the time, then second half of the day for the other string.
increasing panel means more area to have the inverter at 100%, but honestly i fell the added cost not viable.
i dont have my roof picture with me, but cant change the roof as you say

and yes, optimizer included
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So you can monitor per panel performance? Meaning to say each panel how much output?

Coz if your system comes with optimizer, then shading/ roof angle doesn’t sound like an issue already for me.


bee88
post Oct 3 2023, 06:18 PM

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user posted image

My sistem look like this. Can monitor panel performance at every interval of 15 mins.

Optimizer should also be able to do that.
bee88
post Oct 3 2023, 06:22 PM

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QUOTE(netflix2019 @ Oct 3 2023, 06:20 PM)
How do u check how many hours?

My neighbour same setting but generate 10% extra. I always assume because of roof angle. His conventional two slope. My roof a lot pattern with bug sun window in middle. So my solar arrange many different patch.
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Total sept generation /30 days

Then the figure / system capacity

That’s the sun hour.

Yes. Can be roof position. His house facing direction same same?
If next door neifhtbour, same placement, then it goes to the panel performance and inverter performance r
bee88
post Oct 3 2023, 06:24 PM

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QUOTE(netflix2019 @ Oct 3 2023, 06:22 PM)
Holy shit yours so dope. It's nice to see all different panel. I always paranoid wonder8ng if all panel connected or not
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To be honest, I don’t encourage ppl to go for string. Coz string got high dc voltage. Can cause arc fault if wiring become bad after uv exposure.

Overseas they have maintenance , they pay for it to check the cabling, but here , hehehehe. I am not sure about that.

This post has been edited by bee88: Oct 3 2023, 06:58 PM
bee88
post Oct 3 2023, 06:30 PM

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QUOTE(netflix2019 @ Oct 3 2023, 06:29 PM)
What is string? What's the different? I don't even know got different different set up.
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If ur system is one inverter in the house, that is string.

Mine is divided into few micro inverters. All hide neatly under roof.

Down side, if ever need change, need to remove upper panel to change.

But I am counting on the reliability of it that claim it can last 25 years la.

Warranty also 25 years. Need to top up a bit though.
bee88
post Oct 3 2023, 06:32 PM

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QUOTE(yeapsc73 @ Oct 3 2023, 06:30 PM)
I am lost. How to get the 3.4 from the picture?
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1460kwh (1.46mw) /30

48.66kwh average/ 14.3 capacity

So it’s 3.4
bee88
post Oct 3 2023, 06:41 PM

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QUOTE(yeapsc73 @ Oct 3 2023, 06:37 PM)
i see. thanks ya

any recommended/affordable installer for 4 to 5kWp system?
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When free I pm u k.

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