Solar installation, the earlier you adopt, the better, last time FiT, ppl oredi earn kaw-kaw, that time the price was very high, and ROI was around 6 years. Today, their FiT income can pay for monthly car/house loan.

Now is NEM, depending on your consumption, the ROI is between 7~10 years. Contract period is much shorter than FiT.

As of July 2023, there is the ICPT adjustment (calculated before solar offset) that will hurt consumers:
- less than 1.5k kWh, rebate -0.020 sen/kWh (usage 1500kWh = RM737.50)
- more than 1.5k kWh, surcaj 0.10 sen/kWh (usage 1501kWh = RM924.69)

https://www.mytnb.com.my/residential/unders...lling-component
https://myelectricitybill.my/bill_calculator_domestic.html

This post has been edited by alexei: Dec 5 2023, 09:16 AM

What we're thought, is that solar price will decrease and duration to ROI will decrease. This was correct, but the ROI heavily depended on the scheme provided by TNB. Last time, RM10~12k/kW now Rm4~5k/kW. Solar price did go down, but ROI was longer.

Moving forward, solar price will keep going down, or the technology gets better. Electricity tariff heavily depends on cost of fuel, and subsidy. Right now, fuel subsidy and electricity subsidy is going to cut. Biggest question will be, what is the NEM to discount ratio? The economics of solar will 'self balance' between solar vendors pricing vs TNB scheme. Otherwise, everybody will rush to installing solar and we end up like Australia.

In short, I foresee ROI will maintain between 7~10 years no matter the solar technology or pricing, unless something distruptive comes along.

Solar and electric cars: right now, electric cars are using ~20kWh/100km (credit Boy96 on his AMA), so that's between RM4.7~RM12.3 per 100km depending on the TNB tariff rates, or equavalent to 2.3L~6L per 100km based on current RON95 price of RM2.05.

Comparing to a car that consumes RM20.50 per 100km (10L/100km), that's a savings between RM15~8.2 per 100km, or 80sen~40sen savings per 100kWh.

So, if you move from petrol to electric, remember to include petrol savings into the solar ROI.

This post has been edited by alexei: Dec 5 2023, 09:49 AM

MGM

So, example, if I drive 10k km per year.
That's RM2050 petrol, vs RM1230 electricity.
Savings is RM820 in petrol per year.

Depending on what else wanna factor in from the car maintenance vs EV maintenance... oil change, engine parts, major service every 50/100k km, also, petrol subsidy might be going away... the ROI calculation gets interesting push towards adopting solar and EV

This post has been edited by alexei: Dec 5 2023, 09:58 AM

The consumption also varies by car, I'm sure, just don't have the numbers
the savings formula should be simple, such as RM8 savings per 100km

Unrealistically speaking, if use the EV and drives 100k km per year (274km daily), the minimum savings is RM8k per year. That's almost ROI for a 2kW system.

4kW yield around 4~6hours a day, that's 16~24kWh, meaning 480~720kWh per month

maybe I was a bit too optimistic
I got 3.46 in 2021, 3.27 in 2022, so far 3.05 for 2023...

no ler, ppl I know who install FiT are the calculative type, and they see the value oredi
some will take solar loan, some use own cash to fund it
I remember last time FiT, Alliance give solar loan at 5~6%, many ppl just take it

then it's worth looking into the maths vs actual

assume commence in mid 2018 (5 years ago)
source: https://www3.seda.gov.my/iframe/


4kW FiT at RM0.6682 - average 3hr daily, is monthly 360kWh = RM240
I think the capital that time was around 30~35k, so the ROI would be 12 years or less

Hmmm, how did I remember FiT ROI being much shorter...