Correct, hence the battery storage system.
The price for Lifepo4 16s 280ah / 14kwh battery pack is around RM 9000 - 10000 today.
14kwh is quite small though.

I don't even want to bother with SEDA and my local SESCO anymore.
Straight opt for self-consumption with battery.

Previously, I secured all the necessary materials for the NEM, but unable to find NEM qualified installer/contractor to get NEM application done.
Thus zero-export grid tie.


-.- Since nobody at home from morning to evening*, the saving is really minimal in zero export mode.....

K then, time for battery storage :





The only problem is my battery capacity is too small for my solar panel capacity of 4200watts.
51.2V 200Ah.

Currently securing purchase of 16 cells of EVE LF280K and 16 cells of Batterotech BT280......
Gonna parallel all 3 packs for total storage of 38kWh.

This post has been edited by JohnLai: Apr 1 2024, 03:16 PM

Current installation is very messy.
Don't get me started with leaky roof and requires sealant etc....Not to mention buying non polarised breaker for the battery connection to the off-grid-inverter.

I gonna wait for my EVE and BT cells to arrive first before making any changes to current installation.
Should arrive in April or May if I am not being scammed?

No NEM contractor in Sarawak except 1 company in Kuching which not interested in providing service.
Cause I already purchased all the certified solar panels + inverters + breakers + rails + wires etc, all contractor need to do is install it and certify it.
Takde untung banyak, mereka tak nak. They actually want to sell me their expensive package.

Problematic Sinopoly cells, had to replace 2 cells before getting all 16 cells stable.

Cost? Wasted RM3000 for grid-tie-inverter Growatt 4200TL-X which in storage room now.

Roof = hired electrician contractor to install panels, they farked up my roof so hard that I had to take off the roof zinc metal sheet and railing.
At the end, I had to buy new zinc roof and perform the solar panel installation at my rooftop on my own and the result is WAY BETTER than so called qualified electrical contractor workers.

The electrical contractor simply sent 2 workers to install the panel at my rooftop.

I can confirm 100% these workers didn't have the knowledge on how to install the panel or even having electrical knowledge, don't get me started with how they left the wires exposed and hanging.
They don't even have the proper tool to tighten the bolt/nuts. Ever heard of torque wrench? They simply use normal spannar to torque down the bolt until the solar panel metal got bend. Farker.
They connected the MC4 connectors to the solar panels in broad daylight and left the "LIVE" wire hanging down, luckily there was no short circuit happening. The panel voltage is more than 200v in series.

End up terminating contract with this certified electrical contractor. They didn't ask money from me after I show off the damage to my panel and how the live wire was left hanging.

Only approval from local authority on the rooftop installation part. Had to find another electrical contractor to sign it off which I got.

It is off-grid-inverter, no need for SESCO permission. Plus https://www.sarawakenergy.com/electricity-a...enewable-energy

My local SESCO branch here when I asked = Saya semua tak tahu Sound familiar?

https://www.sarawakenergy.com/customers/net...metering-scheme
https://mut.sarawak.gov.my/web/attachment/s...QC2C_D3t1Ei9k10

Remember, the official response is, "Tak ada benda ini".
Funny considering their website has NEM with full details just fine. I got scammed by SESCO, that all.

RM 4000 for Sinopoly 48V 200aH (Shouldn't buy from shady supplier, my great mistake)
RM 12000 for upcoming EVE and Batterotech 280Ah
RM 8000 for 4200watts solar panels, technically the total is 5340watts solar panel after I added 4 more panels, but I only able to reach average 4200-4800 watts for most of time at noon (Work very well)
RM 3600 for Growatt SPF 6000 ES PLUS (Off grid model) (Perfection in every way?)

Burned RM3000 for Growatt MIN 4200 TL-X (Grid tie model) (Work great with zero export, not suitable for my usage unless if I can get into net metering)

Not sure about the other misc stuff such as torque wrench, nut, bolts, railing, breakers,wiring, BMS (JK-BMS), active balancer etc. Around RM3000?

SEB and SEDA = don't even waste your time. I tried, and they really not interested to do net metering at all. Requirement = NEM contractor. Minta list kontraktor, "pergi cari sendiri, sini takde list contractor NEM"

Half-cut solar panels 445W monocrystaline x 12 pieces bought back in year 2020.

Ever try to order solar panels to sarawak (the wooden packaging crate and foam etc) and paying all those custom duty?
Tell me if the price is worth it or not.

I got a feeling that this is not a properly built house, rather it is a warehouse with no permit.........
A properly roofing support will not use that kind of wood.....ada occupational permit ke ni?

Sarawak SESCO domestic rate for comparison

Received 2 sets of new cells:

16 Batterotech 280ah
16 EVE LF280K v3 280ah (plus another 2 extra cells as spare)

Done installing these two sets in parallel during Gawai holiday.
So far, due to rainy and cloudy weather, I am unable to get those packs to reach 55.2V not even once.
My JKBMS integrated active balancers and external Neey/Enerkey 10A balancers don't even turned on at all.

It had been almost two weeks......
I have no idea on the SOC % now since it never reach the voltage that I consider the cell to be fully charged.


Awaiting another set:
16 EVE MB306 306ah


Will be using the extra two spare EVE LF280K cells to replace two problematic Sinopoly cells. Frankenstein time? Currently the problematic sinopoly cells are not connected into the parallel busbar circuit yet.

Dei.....you want to me to die ar.........Check your PM later. I still want to live.

edit: Done sending you some of pictures, don't share it.

All done by my self and my dad.

This post has been edited by JohnLai: Jun 14 2024, 06:33 PM

Nay........my system still have questionable issues, although I have 200A DC breakers, but it doesn't have T-Fuse and the busbar kinda exposed right now. I am trying to find shop to cut a custom molded case for the busbar cover.......

Told ya that why I don't wanna share it.

Planning to redo the balance wires after the EVE MB30 cells arrival.

The spring compression part is the hardest. I had a hard time trying to screw the nut because the other side keep on moving after certain force.
75kgf on each end is not easy. 4 spring on each corner = 300kgf.


Bottom is Batterotech and the second level is EVE LF280K.

Not sure if you can see it, but there are 8 cells at the back and 8 cells at the front on each level.
16 springs total.

No idea, I bought it from Shenzhen Qishou Technology Limited and still waiting for MB30 arrival....in another 2 months or so?

Bro.....that 7kWh output is under Standard Test Conditions (STC) aka perfect laboratory condition. You should read the spec on Normal Operating Cell Temperature (NOCT) instead.

Generally, you should expect 70% - 80% of the advertised STC output.

7kwh x 0.7 = 4.9kwh, roughly same as your app reading of 5kwh.

Just go check your solar panel specification on STC and NOTC:
There should be a datasheet at the back of the panel.
Write down the Voc, Isc, Vmp, and Imp detail here.

This is known as overpaneling.

Sure, if his panels STC are met (temperature, sun irradiance, cloud edge effect etc), those panels could produce around 7500watts which is beyond what his inverter can output , but such situation is rare........

Depend on the earth tilt too.

Have a look on where the "sunspot" on earth move around Malaysia near equator within one year
https://himawari8.nict.go.jp/

At a time, the "center" of sun round move across Indonesia.....another time, it moves across Sarawak.......another time, it moves across Thailand.....