1) This 5kw system is before or after x 80% efficiency? If hasn't x0.8, that means it is effectively 4kw, for rm22k?

2) My house is 3 phase, how much more is needed for 2 more inverters + installation setup?

3) Or can I just connect it to one of the phase that consumes most electricity?

4) Does the RM22K includes batteries? If yes, what is the capacity?

5) I wouldn't mind hiring someone to do this as my monthly tnb bill is close around rm450. Do you have any reliable contact for hiring?

Thanks bro!!

Hahahaha I saw your lithium battery setup, way too exp. Does the life span justifies the initial cost?

I will check tomorrow whether is my hydroponics light ac or dc, can't remember now.



By the way, I found some cheap solar controller from China on shopee/lazada, are they reliable?

https://shopee.com.my/12V-24V-MPPT-Solar-Ch...5054.1750642907

https://shopee.com.my/HOT-SALE-40-50-60-100...0112.2272173054

https://shopee.com.my/LCD-10-20-30-40A-3-Ti...8425.2380205894



Or do I need to get really expensive ones like these?

https://shopee.com.my/60A-MPPT-Solar-Charge...7968.1233629292

https://shopee.com.my/30A-40A-MPPT-Solar-Ch...0253.2215518015


Thanks!

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.

This post has been edited by yushin: Aug 15 2019, 10:30 AM

Lithium battery by nature is more efficient than lead acid batteries. It will be cheaper using lithium batteries in long term. You can google to compare the benefits of lithium vs lead acid on solar energy storage.

If your hydroponics light is DC then you can save money no need to use inverter.

For small scale solar power implementation, cheap MPPT charger from china already good enough. If you want to use lithium, take note some of the cheaper charger can't support lithium battery charge profile.

More expensive MPPT charger has the ability to do data output to computer and more charging parameter to set, if you're the type that like to tinker with the setting and use computer to record data from charger, then you will need the more expensive chargers.

Will Prose does a comparison between Lead Acid and Lithium Iron Phosfate for solar use.
This is the first time I know hydrogen explosion from ovecharge acid battery really happens.

MYR (RM)
Single core Solar DC cable
4mmsq

Doing a market survey..

Legion Solar 4 - Permission Free Energy and Storage, via @Kickstarter https://www.kickstarter.com/projects/plxdev...rgy-and-storage

Am thinking of cheap devices to lower down electricity bill. Anyone tried this product before or have any comment? I don't have any experience in this field so would want to get some advise. Thanks.

Argh, this kickstarter thing is complicated...
Can save or not really depend on the package you get, also depending on your power usage pattern.

Btw what is your monthly bill? If less than 300kwh monthly I don't think its worth it to do solar in Malaysia.
Maybe can start by doing some solar car posh or backyard light to get a feel of solar system.

Usual monthly bill around 500kwh. Not too much, that why looking for cheap option. Was thinking this would help to offset some day time use. At around RM2.5k for a starter pack, looks worthy to offset some electric charges for long run. And the option to scale it in future if needed.

With only 500kwh consumption per month, I think it would be better if you can consider some power savings methods like:
1) Changing to power saving led light.
2) Use electric appliance that has better power efficiency.
3) Run your aircond on 25c.

I believe major power consumption in your house would be the aircond?

with only rm2.5k budget for solar, hmm... maybe
1) Front yard light
2) back yard light
3) a solar powered fan to help ventilate your house

anyone here eligible for mygreen+ from tnb? saw this in my tnb dashboard.

Looks very interesting, but the quota almost fully taken up.
As of the time I saw it, only 30kwh still available...

Total Opening Quota (kWh):37,267,230
Subscriptions (kWh):37,267,200
No. of Customers Subscribed:39
Available Quota (kWh):30

39 customers used up 99% of quota, somethings fishy here.

Big factory or business building can eat a lot of power.

Smaller grade B LFP and high power battery tester has arrived.
Blue color = 200AH cell selling as 150ah
green color = 100ah cell but fat a bit liao
40A high power battery tester. 18650 battery put on top as size comparison.




This post has been edited by yushin: Oct 22 2019, 06:41 PM

Why sell at 150ah? 2nd hand?

Overcharge the battery? Still can use?

This 40a is test the battery discharge or charge the battery? Can Lipo discharge that high?

Tester got data output to PC?

Very likely 2nd hand or cell that kept too long in storage. Price matches the quality.
This battery charger can charge and discharge battery at 40A, cell voltage only 2- 5v.
Tester can be connected to pc and the V and A chart can be plotted, got more chart I didn't fully explore yet. The software has english version.

This is the chart of me testing the green 100ah bloated battery using discharge and charge cycle at 40A (2.70-3.65v).
Looks like capacity only 37ah when 40A. Later try charge/discharge with 10A see how...
Blue line is V, red line is A.


This post has been edited by yushin: Oct 22 2019, 11:15 PM

Got to check the battery max discharge spec. If discharge at max Ah of the battery, it will give lesser Ah. And battery heat up.

I discharge most of the 18650 at 500mah. Max 1Ah if no patient.

So the 200ah show 200ah or 150ah after test?

Will test the 150ah battery tonight, don't dare to test the battery when i'm not around the house.

Yesterday test the bloated 100ah battery with 40A and 10A. Capacity is only about 38AH.

38Ah is ± around there. But the bloated..

Even most of the 18650 I test won't exceed or same as the state capacity. Usually below.

This weekend project need to temporary add another 500w of panel. Raining season reduce the capacity alot.

It kill the battery when went too low.