application till the meter cost rm3+++, not including wiring work. So can come out to about rm6000.

Nope, they won't connect the cable from the tiang, it will cost more.
They will just tap from the nearest point.
So :
1. no comment, you can safe it if you DIY, but more hassle
2. about there, as said, depending on the cable being tapped, if bangalow, it will be more
3. should be about rm800-1500

Will be more expensive, how substantial I am not sure. Do update us the price, good to know. On the +ve side, it look much better if meter are outside.

For single phase, cabling after meter into house is prepare by house owner. Assuming 3 Phases should be the same, and do over spec the cable (thicker than standard cables)

You can used armoured 4 core 16mm size. Or even better 25mm cables.

Do you really need 3 phase? single phase (60A incoming) can run 6 X 1.5HP AC (5Ax6) simultaneously with a lot of spares. Last time my house i did rewires for 3 phases ready (originally came with 2 core 16mm and i added another 2 core 25mm from incoming to the db to make it 3 phase ready, but i ended using single phase for nearly 3 yrs now nvr had an issue or tripping. can check what i did at my tread.

you can do like me, get electrician to pull additional 4 core wires for 3 phase ready, not necessary you need to apply with tnb straight for 3 phase. as i say for single phase shall suffice if you are loading 50% as per said items, get TNB to change incoming fuse to 100A, and at the DB you can used 63A units. if you are running 3x1 HP + 2xWH simultaneously will not cause problems, at max you are pulling 12A+30A for those items.

Getting Seda? Want to sell back to TNB?
What is the goal you want? If invest to gain money, then you may think again.
I have 2 friends installed this, 1 installed long time ago and his ROI are 7%, another is lower at 3-4%
The rate is getting lower and lower now. So for cooling your house, then go ahead, if trying to make money from it, sorry, wrong tools.
After installing this solar panels(on the right direction to harvest sunlight), you will have a cooler house, your air cond cost also can come down.

On a 4KW system or higher rated?
The rate are dropping every year.

What are the purpose of having multimeter?
If really worth it, i will go and get one. 

Good idea. Haha
You make me scare la. 
Then i should forget it. 
Seems like you are hardcore fella in this. 

Hi, wanted to know how the cables were pulled from your meter fuse to the switch box inside your house. Usually for a double story house, the switch box is located in a small store room under a staircase. My understanding is that two additional cables will need to be pulled from the meter fuse (usually outside the house) to your switch box (I may be wrong...), going through the car porch, living hall, till the store room. If this is the case, will it be a big messy hacking need to be done?

Appreciate if you could also PM the contact of your contractor, thank you!

hi guys, my new house already come with TNB cable for 3 phase but the TNB meter is running only single phase. I had change all my db and 3 phase cabling to the TNB meter. Now left only applying from TNB for the 3 phase meter which is bigger. I was told to get runner which cost around RM2.5k include deposit and replacement of the new bigger TNB meter, is this pricing ok?

Bro, you apply it yourself?

Hi
Mine 1.5k to settle all TNB stuff. My wireman help me for free