guys, i'm considering to install solar, and the intent is to wipe as much but not necessarily in full. at least to get a consistent wipe rather than having excess capacity that is variable in the bill. the bill with aircond running full when there is humans inside, i expect to be around RM300 at least. i don't consider using batteries to avoid unnecessary replacement cost.

(1) what's the difference between 1-phase and 3-phase?

(2) if given that there is no difference in electrical usage pattern, is there savings when comparing 1-phase and 3-phase?

(3) do i need to change current electrical equipments if switch from 1-phase to 3-phase?  (lighting, LED, smart sockets, fridges, ceiling fans, airconds, everything). do i need to re-cable the existing tri-colour inside walls?

(4) for solar, is it necessary to switch to 3-phase? or is there cut-off number in deciding between remaining on 1-phase or to upgrade to 3-phase?

Govt want to control solar panel supply to jack up price and feed cronies. Otherwise, prices could be easily lower by 50%. Why don't allow open market sourcing instead of restricting and over regulating supply?  Our Green Minister should look into this.

i know my house is 1-phase. I don't know what's the difference between 1-phase or 3-phase. I don't know what's the fuss with 1-phase or 3-phase that some forummers above are talking about, even to the extent that some posted having to switch to 3-phase at a bomb cost. THAT IS WHY I AM ASKING. exploratory stage.

under NEM, does that mean

(1) if i am not at home in weekdays, it keeps on generating excess into grid? or is it only for real-time immediate usage in same premise only?

(2) if it is excess into grid, is there an amount as rebate?

(3) if got rebate, can it offset when i use from grid at night or on weekends?

Thanks for sharing.

I'm in a dilemma on which solar companies to go with.
Company A offers 11.80kWp for RM38k
Company B offers 13.12kWp for RM47k

Monthly bill around RM850 or 1650kWh. While option A is cheaper but savings of RM650 monthly isnt a lot and with a small size (kWp), doesnt feel future proofing if tariff increases.

Advise?

Based on this actually your consumption 1619kWh (total consumption) - 673 (NEM excess) actually after offset you are not supposed to be charge surcharge
so can complaint to ST(Suruhanjaya Tenaga Bureau) this because ST wasn't aware.

I got this news from my Solar installer company just now, they are compiling all the complaints and forward to ST.

No, during daytime we also get from the Grid, our solar energy is exported and we import the Grid energy. Hence they offset during daytime but not the night time when we have surplus from daytime generation.

The solar db is connected to our house db. It’s not connected to the Tnb grid directly. 

So it will be self consumption first, then extra will be sent out. This is confirmed.

Yes, u need to have Tnb supply to start generation. But that only to start. Once ur system produce enough, u don’t draw from Tnb anymore.

Also, one thing to consider. Ur system could be producing 1-2kw in the morning, before it peak, and at that time if u on aircond, maybe ur usage is more than 1-2kw, so the balance they draw from Tnb.

But when u peak at 10-12kw during afternoon, and ur appliances only run about 1-2kw, u will send the extra to them. 
So the net import figure from the bill is from this kind of usage.

If our inverted can do it, why can't during blackout period? Simply because our inverter cannot cater for direct usage.

Show me where its said this "Yes, u need to have Tnb supply to start generation. But that only to start. Once ur system produce enough, u don’t draw from Tnb anymore. "

I connect them to my 2nd floor DB ... So my ground floor not using solar energy? They do travel backward to the meter?

Can't I just connect solar panels to the ev charger without informing tnb/sesco? By my calculation to charge an ev I need 32 solar panels?

To the solar owner, in case you would like to monitor your solar generation, grid, and load in realtime (mobile app only), you can consider installing this bidirectional energy monitor (https://expo.tuya.com/product/1105297 , from Shopee or Lazada).  NOTE: This is for a single-phase house.

I will recommend an energy monitor with 2 CT, where the 1st CT (current transformer) monitors the TNB input (as Channel A), while the 2nd CT (as Channel B) can either monitor your load or solar wire (subject to the complexity of your wiring). For simplicity, monitor the solar AC input. Channel C is derived from Channel A and Channel B.

For example:-
Channel A: TNB input
Channel B: Solar input
Channel C: Channel A + Channel B = Load/Consumption

NOTE: The above works well if both TNB and solar input meet in the same DB box; otherwise, you will need 2 units of energy monitors, for example, one for the TNB on the ground floor and a second monitor unit on the 2nd or 3rd floor where your solar inverter is connected.

For smart home users using Home Assistant, this energy meter does not give valuable (limited) data for plotting graphical energy flow between grid, solar, and load.

Actuallu it’s possible to offset all 3 phase with single phase inverter. 

Not sure if this is possible with string inverter. Micro is possible.

Then you go and whack your solar vendor/installer, they are the expert and not advising you properly.

Usually they will use the correct inverter according to the phases. Later no saving kena diao from customer ler.

Unless your house is single phase else there is no logic, right?

Company reputation at stake wor ... who in the right mind would do this?

If I am the user, you know i do if I found out this issue? The solar company will get reported to the ministry due to incompetence for product sales. This is a serious issue and the company can be hauled up.

Like you have said before, they are awared of short coming yet still give you the wrong advice. Like it or not to me this is a fraud.

They are supposed to propose a solution, a proper one that is. Unless they gave 2 options then you choose the cheaper one.

Yes. Many people just buy without looking at what they actually getting. Coz the agent usually just highlight the savings and savings.

From this quotation, i think this  is usually for single phase. 6kwp system usually for single phase max.

Of course there is a possibility that a 3 phase house is installing 6kwp system as well lah.

But yea. Look at the inverter model. 1p means 1 phase. 3p means 3 phase.

But I will still avoid string if possible due to high dc and arc fault which can cause fire.

I always enquired with my sales consultant regarding the solar setup before finalizing else you got misinformation. If what you asked is not what you get then pls go to tribunal court.

The solar company name is at stake. Btw don't get yourself confused with financial world ya.