Quite the speculative venture you got there. So you are investing 50K on a 9kW system which would take 7 years to recover initial cost. By the way the 9kW is calculated as power generated per day assuming the weather is good?


I guess you gotta amortize the cost of the equipment over the life span of say 20 years, calculate your earnings of RM250/mth of this 20 years to get your ROI and CAGR. In the end still cannot outperm EPF which is 6.9%.

Hi, I don't think it will give you any benefit financially. Not anytime soon, anyhow. Unless our electricity tariffs increase, or that the government decide to restart the FiT scheme again (in which they pay you in cash for excess electricity). Currently, what you can expect is that you are only paying GSparx for leasing the panels, and instead of paying TNB the same amount (RM250-350) you are paying for the lease while getting electricity. Once the lease is up, then only you will see the benefits.

Generally speaking, unless your electricity bills are in the region of RM300-400, there is no substantial benefit. Just that you are doing something good for the environment. Or if you are using that solar power to generate income (BitCoin, as someone is doing on this thread). GSparx is coming over to review my house this weekend, if you are interested, send me a PM.

Thank you, but this weekend i'm not in town. I would assume the my place would be more as it has 3phase instead. My average monthly bill is around 300 on single phase.

Do you mind to share which area is your solar installation? and average KWh per day generated from Solar?

Klang Valley area only has around 3.5 hours sunny day average, if you can get 5 hours sunlight, your ROI will be good.

Well, the monitoring tool on the inverter doesn't have a good reporting function so I have calculate it using other method.
On average with the current 5kw panel and 48V100AH batt I manage to run 1600w of load 6 hours without using TNB.
Thats about 9.6kwh of generated power per day. Currently the sun rises behind the panel. Less effective

The battery is usually full before 12pm, unable to absorb more power from panel.
I think when additional battery arrives the generated power will improve even more.


Additional 4kw not yet installed so not sure how effective it will be.

This post has been edited by yushin: May 27 2019, 11:16 AM

For a fully charged battery how long can it power your system using just the stored power. Wanna know the efficiency from DC to AC.

Your hybrid inverter will switch over the panel supply to TNB once the battery full ?

No such function ?

48v100ah, Average 1600w load, About 2 hours 10 minutes.
I setup inverter only use about 80% of the battery charge.

This inverter has higher efficiency because its design to work with 48 system (42v-58v range) only so optimization can be made.

This post has been edited by yushin: May 27 2019, 11:47 AM

Nope. The inverter is not design to send power back to TNB.
So when the battery is full, the panel will power the load. Additional power from solar panel will not be used.

Thats why in the middle of the day the solar panel only register 1800w...
I need more batteries to store the solar power on midday...

would you mind letting me know what equipment is installed for this kind of setup? is the equipment very bulky for the db box and battery panel?

Manufacturer got stated charging cycles lifespan of the batteries? Given the daily charging and discharging how long you think the batteries will last?

Lithium Iron Phosfate battery are design to have 2000 cycle on 100% discharge rate. If you only use 80% discharge rate the cycle can go up to 3k+. These numbers are cycles the battery go through before their capacity drops to 80% of original manufactures capacity.
I am expecting at least 10 years for my LFP batteries.
BYD's LFP battery pack that use for home solar power storage has 10 year warranty up to 80% of claimed capacity.


Note:
This is not the normal lithium battery we use in our phone or torchlight. Those lithium use in phone is Lithium Cobalt Meganize and usually has about 800 cycles.

Btw lithium titanite (ya another type of chemistry) has up to 20,000 cycle but its quite rare to see it here. Works well at -30 degree cold weather.

This post has been edited by yushin: May 27 2019, 12:14 PM

Solar panel = 14kg each, its on your roof so it depends on your roof space.
Inverter = about 10kg, size about 150% of A3 paper
breaker and battery switchbox = about the size of A3 paper
If you use only 1 set of battery you no need switchbox for battery.

Battery are the heaviest and take up most space
BYD 48V50AH battery pack = 35kg each

CALB 48V400AH battery pack = 208kg/set (16 unit of 3.2v 400AH cells)

This post has been edited by yushin: May 27 2019, 12:23 PM

thanks bro.

So the Right side part wiring is isolated ? not connected to your house wall socket ?



What happen panel not enough charge the battery and running the load? TNB supply?

If battery full, Panel and TNB supply the load ?

If sunset, battery and TNB supply the load ?

I'm interest to know. Please share your information.
My Bill is average at RM300, but I think will become more as family members increase

The right side is only connected to selected socket in the house. I made a separate DB for the 230v output fro the inverter. No way 5kw inverter can supply everything in the house.

What happen panel not enough charge the battery and running the load? TNB supply?
TNB will take over if no solar input and battery empty.

If battery full, Panel and TNB supply the load ?
If battery full, (solar and battery) or (battery only) will supply the load. TNB will not be used.

If sunset, battery and TNB supply the load ?
Battery will continue supply to load until empty then TNB take over.

This is how the connections suppose to look like from the user manual.



This post has been edited by yushin: May 27 2019, 05:49 PM

Guess not a grid tie inverter. So it is isolated from the grid (TNB).

Also can't fully utilize the panel to generate energy perday.

Unless the load is 100% of the panel capacity.

How much did you pay for the battery pack?

Thats the reason I need a big battery to store the extra energy.