No. The voltage is volatile. U will depend too much on the weather.

I don't have EV charger myself but I believes those wall box EV charger draw power from TNB (230v) then convert to DC (800v) to charge the car.

If not mistaken, wall box is also ac.

It’s either 7kwp(single phase)
11kw or 22kwp (3 phase)

Some ev car can only take 7kwh ac.

And dc charger at home I heard very very expensive.

Agree. Solar first but the cost of set up for 10 panels around 15k

But since I have a battery in the system. I can reduce the panels.... Right?

U must see how many kwp your system. But don’t go for battery lah. Go for nem.

If you go offrid you need battery to help stabilize the inverter. There are some hybrid inverter that claim they can work without battery la... but I worry invester will die fast without battery to stabilize the inverter circuit.

Solar Panel (DC) > Offgrid Inverter with battery > Wall mounter EV charger (AC) > EV

Actually there is a type of hybrid inverter that uses TNB power to fill up the gap in time where your panel got block by sun, then you no need battery.

This post has been edited by yushin: Jan 4 2024, 11:35 AM

You need to check what power you actually need then only calculate the panels.

If there is a kick in, there will be an interruption. All dbs draw their power directly from TNB source.

My ground db trip, the 2nd floor not affected.

Can we use direct power from solar panel?

Yes, it is possible to use a direct solar panel output to run home AC appliances by adding a solar charge controller connected to a 12V battery. The solar charge controller regulates the voltage and current from the solar panels to charge the battery.

Overseas people they use a Zappi EV charger to take directly from Solar

That's true. Plus you only "break-even" years later minus your installation cost etc.
So don't bother. If wanna save just find *cough any elec kaotim *cough ehem.

But I do have the solar water heating, now this is best.

Related
Can we use solar panels and electricity at the same time?
Yes, that's how they work.

Any electrical loads in your house will draw their power from your solar panels if it's available. Any excess power your solar array is generating will flow back out into the grid. If you're using more than your panels can supply the shortfall will be pulled in from the grid.

All this happens automatically. You don't have to do anything.

You could be correct .... i rest my case.

If you have low usage, don't bother.

DC 50kw probably cost 100k plus cabling and installation

NEM out of quotas at the moment need to wait for government refresh, but dont know when will this happen

not true. i purposely try to charge my ev during noon time. while charging, the tnb incoming kwh reading didnt move at all.

of course i set the charging current at minimum (5A 3 phase, or about 3kw) while the solar generation is about 5kw at that time which can fully cover the ev charging capacity

Sorry, I misunderstood your earlier post, thought you meant the difference of units went missing.

Yes my generated units in solar app has been higher than the export unit recorded on the bill.


My apology for didn't read the post properly.

No worries. I know those explanation by solar provider mostly cannot pakai one. Those selling the products don’t really know except telling u how much u save. Technical staff u need to ask those wireman that come to install.

I also got lots of misinformation from solar provider when I scouted for my system.

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.