Sophon

It sounds like you closed the fixed deposit account prematurely. The 469.72 is the interest you would have received had the deposit been fully matured. The 366.97 is returned interest because the account was closed prematurely. Net interest is 469.72 - 366.97 = 102.75 and 15% tax on that net interest is 15.41.

Because of the location I will not have the inverter connected to WIFI, so if I want to see data/status I have to physically go down to my equipment. So seeing the batteries parameters in the inverter doesn't really give me any benefit, I can just check the batteries directly. There is one place in the house that I am able to pick up the bluetooth from my DIY battery pack, but not from my Liyuan pack.

What is the reasoning for this?

I have no idea. I have two 280aH batteries connected in parallel without communication with the inverter, everything is controlled by voltage. One of my packs is a DIY job, while the other is the same Liyuan battery (with JK BMS) that you have. If the Deye inverter doesn't work without communication established, can I just connect the communication cable between the inverter and the Liyuan battery pack?

Another thing from the Deye manual, that I don't understand: This is something I haven't seen when watching people installing solar (professional or DIY). What's the purpose of wrapping the battery cable and BMS communication cable around a magnetic ring? The recommended cable size for the battery is 95-120 sq.mm. (for the 10KW and 12KW inverter respectively). I would imagine trying to wrap a 120 sq.mm. cable two times around a magnetic ring could prove quite a challenge). I am a bit worried that the Deye inverter won't work with my existing batteries, I am hoping that it is not an absolute requirement that communication is established between inverter and battery.

I do have MCB's between the panels and the inverter in the current set-up, so am able to turn them off when I want to. But my current inverter only have inputs for two MPPTs, so two strings are connected in parallel. The Deye inverter has three sets of inputs, so by running each of the three strings through one of those "combiner" boxes into a separate MPPT on the inverter I could optimize the production from each string. It would also free up space in my existing CU, as I would no longer need the MCBs to be in there.

The incoming supply to the house is buried underground, so connecting the two earths would mean digging up the NYY cable and run a wire between the two earths. Not really something I want to do if I can avoid it. With regards to the PV panel surge arresters, I was thinking of running each of the three strings through one of these so-called "combiner" boxes: If I were to do that, what MCB amperage should I go for? My current panels have open circuit amperages of 8.79 to 10.12A, but I would like to have the flexibility to easily connect future panels with different specs (maybe even connect two strings in parallel). Would 25A be a reasonable compromise between safety and flexibility?

Sorry, I'm not sure I understand what you are saying. You have the load and grid connection earths connected with your house earth, as well as connection between the house and inverter earth? Because of the distance (50m), I won't be able to do that. My current setup, and what I am planning to continue with the new Deye inverter, is to connect both the inverter metal enclosure as well as the load and grid earths to a local earth rod (I think you have earlier called this a TT island). Only live and neutral will run between inverter and the house wiring. Will wiring the Deye inverter like that work OK and be safe? Thanks for you reply.

It would be very much appreciated, if anyone has a reply to my question (in my post from Wednesday) about how to wire up the inverter? @Crossy? Before I buy, I want to make sure that it will actually work for me.

Another example of why you have to be very careful what you use AI for:

No, definitely an inverter for a 48V battery. The supported battery voltage range is specified as 40-60V.

The wiring diagram in the Deye inverter manual have a local earth rod connected to the metal enclosure of the inverter, and the earths for the grid and load connections connected to the same earth rod as the house wiring: Alternative wiring example where the load earth is not connected: My equipment is 50 meters from the house, so for the current inverter both the metal enclosure as well as the grid and load earths are connected to a local earth rod (TT island?). The house wiring is connected to a second earth rod close to the house. Any problems connecting the Deye inverter the same way? It seems to me that the recommended battery cable size is a little over the top: For all other cable connections the size is specifically mentioned as being for copper wires, but for the battery the cable material isn't specified. Maybe it's supposed to be aluminium, but if so it would be nice if they mentioned that.

Not really. In most countries the income will already have been taxed at higher rates than used here in Thailand, so with the credit you get for the tax already paid no tax will be due in Thailand. Sure, there will be some expats for which this will result in extra tax, especially if they have income that is not taxed in their home country, but which is taxable in Thailand. But for the majority it will just cause extra paperwork. Most serious high earners are not living in Thailand anyway. Despite what some people here think, this move to tax foreign earned income is aimed at Thai people, not expats. We are just caught in the cross-fire.

Perhaps. However, they want to tax foreign income, but they also don't want to limit capital inflows to Thailand. The logical solution is to no longer link taxation to transfers and just tax worldwide income for all tax residents, irrespective of whether the income is transferred to Thailand or not. That's what most countries in the world do.

https://www.bangkokpost.com/business/general/3028760/department-to-amend-tax-on-foreign-income-remittance