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 Home solar 4 months in.

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Kiding
post May 5 2025, 02:14 PM

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QUOTE(nyunyu @ May 5 2025, 02:50 AM)
So if it is under NEM, user can't have battery installed due to policy?
Or is it can be used along with NEM as long as user willing to spend?
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TNB is your big battery, why do you need battery? you only may need to consider battery after 10 years

if you want to have electricity during power trip, you will also need to make sure inverter is hybrid and wont shutdown if grid no longer supply power.

Kiding
post May 5 2025, 10:17 PM

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QUOTE(skywardsword @ May 5 2025, 02:27 PM)
How is the data centre's power consumption like? do they use more during Daytime?

Having Solar deployed to smooth out the peak usage is good, the caveat is, at some point, massive battery farm is still needed. From my personal study, where we can have 1 full month of less than 70% solar generation, we could not possibly depend fully in solar and massive battery farm to pick up the generation requirement for 1 full month??? Hence, TNB with its legacy/Coal.LPG/Diesel powered plants still need to be specced to run at the absolute maximum generation.
But of course, each of us only have data for our own roof top, we may get cloud one moment while the surrounding house have good generation.
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A rack with NVIDIA A100 GPU 20 nodes AI cluster can consume 12KW, and it runs 24 x 7. A data center can have hundreds of rack, it easily consumes megawatts of power 24 x 7. Only large scale solar farm can power AI DC.
Kiding
post May 16 2025, 10:22 PM

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QUOTE(Drian @ May 16 2025, 04:18 PM)
What do you call an offgrid system that directly uses Solar Power to 240V and if the load exceeds the solar power , it will take the additional power from the grid without any battery/or small battery involved.
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once your inverter connect to grid, it is no longer call offgrid! period.

Kiding
post May 17 2025, 09:37 PM

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QUOTE(Drian @ May 17 2025, 12:26 PM)
No off grid means you  do not provide power to the grid , you can still accept power from the grid just like any appliances.
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I know some inverter can limit its power output so that it wont export to grid, but in Malaysia, you tell TNB that my inverter wont export power to the grid, TNB would tell you it is not allowed to connect to grid without permission.

off grid means you don't need grid provider permission to install solar power system.
Kiding
post May 24 2025, 01:14 PM

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QUOTE(Genosyde @ May 24 2025, 10:53 AM)
Yup. It's all the same when it goes in the grid. So, TNB can sell you "green" energy even at night when none of the solar panels are working. It's all marketing and just as dubious as carbon credits if you ask me.
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TNB sells you at cost of RM100 for whole month, but you also get RM100 rebate for export energy credit! what are you complaining?
Kiding
post May 25 2025, 01:35 AM

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QUOTE(Genosyde @ May 24 2025, 11:29 PM)
Don't you find it strange that if you are willing to pay higher rates for your electricity, you can get a certificate that you can brag to the world that you are doing your part in making the world greener? In reality, you have done absolutely nothing.

That's what my rant is about. Not about the NEM.
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I don't give a damn shit about certificate, why do i want to pay higher rates? I just need to make sure my solar system can run good for 10 years, and I will have free electricity in 6 years, that is more matter to me!

Kiding
post Jun 12 2025, 12:36 PM

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QUOTE(pmaxv @ Jun 12 2025, 12:55 AM)
anyone having any experience with lightning strike protection on solar system? do you install SPDs to protect lightning coming from panels, and from grid going into the inverter?
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I installed DC SPD at the solar inverter input and AC SPD at the main grid DB.


Kiding
post Jun 18 2025, 03:26 PM

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QUOTE(numbertwo @ Jun 18 2025, 10:50 AM)
what about for those with 2 sites of a roof, one facing south and another facing north, both receive a different level of sunshine on each half of the day ?
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you can use string inverter, facing two different sides has no impact as string inverter has two inputs and can handle different pv input power.

Kiding
post Jun 29 2025, 08:18 PM

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I charge my EV at day time, so i only export around 390kwh monthly and import around 300kwh per month. it looks like my bill will even get cheaper after July because of the energy efficiency incentive.

I think for those having big export, if you can setup EV charger at your house and sell it at 60 cents per kwh, you can make more money smile.gif
Kiding
post Jul 7 2025, 05:41 PM

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QUOTE(I-Kurosaki @ Jul 7 2025, 08:41 AM)
Mine is a string inverter setup. My roof is single slope metal roofing so don't need micro.
Truth to be told, I gauged my solar performance with my surrounding neighbors (all 4 of them are on micro) and there's not much of difference.
In fact, I'm surprised mine performed relatively better on certain days.
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is your solar installation in northern peninsular?
Kiding
post Jul 8 2025, 01:13 AM

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QUOTE(I-Kurosaki @ Jul 7 2025, 08:10 PM)
Central - Klang
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your is 4.4 sunlight hours in Klang where average is 3.5 hours in klang valley. amazing
Kiding
post Aug 4 2025, 12:35 AM

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QUOTE(zerorating @ Aug 4 2025, 12:29 AM)
lol, how the hell they calculate these perjanaan luar puncak? night for sure no sunlight, calculate weekend only?
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ToU = Time of Use, TNB determines electricity usage based on time, the smart meter records whole house electricity usage probably every min.
Kiding
post Aug 5 2025, 07:55 PM

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QUOTE(Yluxion @ Aug 5 2025, 04:00 PM)
Relatives do use our EV charger once or twice.

Averagely I'm on 90+ km drive per day, 31 days*90km = 2790km @ 640kWh total charged. (new ToU tariff of mine = RM 0.5183) | *if can keep monthly usage below 1500kWh = RM 0.4183)

2790km @ 640kWh * RM 0.5183 = RM 331.71

My past ICE sedan @12km/L of RON95: 2790/12 = 232.5 litre of petrol @ RM 2.05 = RM 476.62 

RM 331 vs RM 476 for 2790km of drive range, really not much savings there, furthermore there're a lot of credit cards that give cashback from 5~12% for pumping petrol.
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cash back from credit card is 5-12%? are you sure? pump rm100 get rm10 cash back? which credit card offer it? I apply it right away!

Kiding
post Aug 6 2025, 11:35 PM

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QUOTE(Barricade @ Aug 6 2025, 02:24 PM)
Why u so surprised?

UOB one card 10%

RHB Shell 12%
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Got TnC, UOB max RM15 per month, useless, tipu orang saja! how to save petrol expenses in this case? that is why need to go Solar.
Kiding
post Aug 16 2025, 03:37 PM

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QUOTE(yeapsc73 @ Aug 16 2025, 10:06 AM)
That's the main reason I went for micro inverter previously as the product itself would last longer, at least on paper lah and according to research. Even if the inverter really rosak and the company sudah tutup kedai,  getting 3rd party to fix also not as bad because micro inverter is modular type and not proprietary any other company can fix easily.

That's the same reason I go for lfp battery rather than NMC battery type EV although NMC one has longer range and I can afford both
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string inverter is not proprietary either, and can be easily replaced by DIY if you have electrical / electric knowledge, it is also easily reachable unlike micro inverter require to climb up to roof.
Kiding
post Aug 17 2025, 07:03 PM

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QUOTE(yeapsc73 @ Aug 17 2025, 05:25 PM)
It is funny that solar inverter sacred of solar isn't it lol
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Depend on the quality of the micro inverter, low quality micro inverter may not be able to withstand >50 degree environment every day, lifespan shorten is expected for those cheap and low quality inverter.

anyway, both string and micro inverter have their pros and cons, only inverter suitable to your house environment is the best choice.

 

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