Hi there, but to challenge that idea is, say disaster really happen, how long can 12kwh battery actually last? What is the cost of installing the solar power? Would it be better to buy a generator instead? Say disaster only happen 10 years later will the efficiency of the solar generator still be good?

The idea of saving the environment or at least reduce my carbon footprint is nudging me but the cost just doesn't justify the means.

Even conservative also more than 6%. Take maybank for example.

That's a good question, haven't tried it but for me during a disaster most likely daytime I do not need to use any power, unless for boiling water or cooking (gas stove). Say just turn on some fans and make sure the refrigerator stays on. Then night time some lights, maybe charge the phone. I think can last for a while. And don't forget, next day the sun rises and the solar battery is being recharged again. So I think I'm pretty much covered, unless the disaster is the sun goes out.

I agree with the fact that this is a hobby (because this is Malaysia), in an ideal world, I hope that the government can give us a tax rebate for having solar, or that we get the FiT system back but there you go, that's the ideal situation. Actually the NET Metering isn't that bad, you can even lease the solar panels, so they aren't yours but they are actually helping you save on your electricity bills.

Saw in youtube on the virtual power producer (or virtual peak plant?) base on tesla car and power wall.
Where owners use their car battery and powerwall to supply back to the grid during the power peak demand and power company pay the owners back.

Not bad actually, but I'm sure those IPP in Malaysia won't like this concept if it gets big.

Alright, I just had a long chat with the solar contractor. This is what I learned. Actually, placing solar panels here in Malaysia for residential isn't really a green move. What it allows you to do is to actually use more electricity than what you are paying for per month. Yes, you do pay upfront of around RM10-20k, but your electricity bills will be either 0 or maybe some small amounts per month. And that is how you achieve a "return" on your initial "investment".

This is also provided that you intend to stay that long at your property (better if it's a newly built one in which you intend to stay more than 20+ years) and also that your roof is big enough and the location is good for solar (north-facing).

The only sure win situation is if your electricity bills are in upwards of RM800 to more than RM1k, or perhaps even higher, then you will see a faster ROI.

So in short, it actually promotes more energy usage if you notice that you are producing more solar than you are using, hence you would be using more (aircons, heating, etc) to make sure you don't generate extra solar power (since extra power is not going to give you any bonuses).

My hybrid inverter charger is 4kw only. I get 5kw panel so I could get more power when the sunlight is less optimal.
With cloudy klang valley weather, I seldom get optimal power output so put 25% more panel lor.

for 3 phase, there are two ways to do it.
1) Use a single 10kw 3 phase hybrid inverter. costs like 14k.
2) Use 3 unit of single phase 5kw hybrid inverter, costs about 12k. The inverters are linked somehow and got software to sync up the phase. but you will need much more space to put the solar panels for the 3 inverters...

rm22k include 4 x 12v 150ah battery. I am using 48v system.

TNB rm450 per month, means one month you use about 1000kwh, one day you use 33.3kwh.
A 5kw system at perfect condition can offset 17.5kwh per day. Which means your monthly consumption will reduce to 474kwh.
At 474kwh TNB bill will be Rm166.78. You can save rm283.22 per month, in a perfect world.

It will take you 77.6 months to ROI the rm22k you spend. Which is 6.5 years. 
BUT!!!
since you're using lead acid batteries, you need to change the battery on the 4th or 5th year so the ROI will be much longer.

PS: Lithium iron phosphate batteries, at 80% discharge rate, have a theoretical lifespan of 10 years. 

Hihi yushin, I asked you some questions last year. Then I was occupied with work and had to put this project aside.

So I have some free time recently, and I'm going to start my hydroponics and solar pv projects soon. I'm thinking to start small and just power the led lights under the balcony, some outdoor lighting, and some small appliances in the room first.

I want to check with you about the battery. I saw from Lazada, a MSB ULTRA BATTERY 12V 100ah, it says 500 cycle life span. So, if I set DOD of 50%, meaning that it can last for around 1000 cycle?

Thanks! =)

I'm not familiar with lead acid battery lifespan 
But I believe if you set DOD of 50% it should last longer than 500 cycles...

Plan to make a 12v system?

1) Should I use 12V system? I'm not too sure about this.

2) Is there a setting on the controller that let me power the load directly during day time (only store excess power in battery), so the battery life span won't get shorten so fast?

Solar Panel -> Load, instead of Solar Panel -> Battery -> Load?

Depending on the type of panel voltage and your hydrophonic power consumption. Any decent controller (even the RM25 PWM controller) will store excess energy to the battery if your load is less than solar panel charge.

Example
Solar panel provide 1000w power
Your hydroponic pump only uses 100w
The controller will charge the battery with the remaining 900w(minus some conversion loss)

You will need a solar controller. Whether its pwm or mppt will depend on your panel voltage.

The voltage of the system depends on your hydrophonic pump and power requirement.
What is the estimated power for your hydrophonic? only pumps?

I see, that's good to hear.

I'm looking at this one, https://www.lazada.com.my/products/ready-st...s975450935.html?

Review seems good. Panel Voltage is 34.5V. You have other better panel suggestions?

For the hydroponics pumps, I might start with one which is AC 40Watts. Start small first. Trial and error. I'm new to hydroponics too. I also haven't figure out how many hours to run it yet.

For now, just to kick start, mainly some led lightings under the balcony and outside the house.

are there any active solar contractors here ? i'm looking to do a NEM 6kw system......

Try contact gsparx,
https://www.gsparx.com/Packages/Residential

4kVA

earlier i cincai called a company online..

was quoted RM16xx for repair. including dismantle and fix it back...