There are many companies now. Mostly are just established few years ago.

If in doubt, always check the ssm  for reg date.  Choose those with longer history.

Also try to understand the nature of the business. Some companies venture into solar and their core business is different. They could be established way earlier but their solar experience is short.

Yup this is a very good advise. There is just too many company doing solar now.
There are many that have close shop or change hand/ change name.
Mind you that all the warranties is tie up to the installer company. So if the company no longer exist, so is your 10 years inverters warranty or 25 years solar performance warranty.

It all boils down to one's risk appetite. Besides, solar panels and inverters rarely spoil.
So if you are one of those that must get all warranty... then GSPARX  (TnB subsidiary) is one of the better option.
If you do a lot of homework, then can choose those established solar company as well with more than 5 years in operation. A google on their facebook pages or hashtag or customer review will show about when they start their business
If you are ok that solar system last as long as you can get ROI in about 5 years, then the cheapest will do and usually this are the new companies. Because it it ain't broke in the first few months, it probably gonna last a few years at least.

Yup usually do it during house renovation project will be better.  But it doesn't mean it will be messy, it all depends on the layout and cable running of your current wires. Basically need to run new wires from meter to distribution box. If it is 2 story house, then have distribution box in first floor and second floor, so need to run the wires from 1st distribution box to the second.

So you can check if you current wire layout possible to conceal them.

You better get a 2nd opinion

Not necessary need to conceal all right? some part maybe put into trunking while some can be inside false ceiling, or hide under stairway, etc.

But anyway, what is the purpose to go to 3 phase? Your current usage is more than 50A and often trip the circuit?

do a simple conversion instead of having all phases going through every level. Balance your load this way is also possible.

If installation in June, then no point.  You will miss the Solaris rebate unless they extend.  Currently it ends in April. Nem continues as usual.

Single phase on paper only 5kW, it's normal. PG?

Yes you should

But did u physically check the Micro Inverter yourself ?

Then just forward the info to your sales representative and have the info update in SEDA

When installation day come , check everything according to your quotation letter

smiles ..setting ..device list ..check themicro inverter ...can turn on from off ?

Yes it is high. 6 hours full sun. Yesterday was great. Mine is 12 KW inverter with 76kwh produced yesterday.
Average is usually 50kwh. Which is 4hours of full sun.

Edit. Do not expect it to be always so high. Or you will be disappointed.

That's considered as very good, northern states?

Your provider didn’t contact u on this?
Consider good lo fro pg ka?

mine 4.92kw cant even reach that high...
max 27kwh.. i think your panel is 6kw+

Can try relocate DTU closer to the panels? It could be loss signal from the DTU.