I'm not sure which charger you have but a quick Google returns iSDT K2 Air 35A Smart AC/DC Dual Charger which is 15w per channel not 30 so that sounds about right.

​​​​​DX8 is listed as 70w total so if you're running both it's 35w max. I don't know how reliable these specs are but that should be at least 3.5a per 2s.

Its 45W per channel, 70 combined per Progressive's and Amain's website

So you will off with a discharge rate of around 5.3A with a full 8.4v 2S pack and increases as voltage decreases.

definitely an upgrade from the sounds of it

70 total, as I said.
​​​​​
8.4v x 5.3 x 2 is more than 70w.

It's like you didn't read the thread or the post you quoted.

​​​​​OP is using both channels.
​​​​​

I’m using the RL Power external discharge resistor bank and all this time I just noticed I’m only able to get 20A discharge rate with 2S LiPO batteries. Discharge is set to Chanel external and 32A (DX6) in the channel settings. Am I missing setting?

You have to set the amperage limit of the discharger circuit. And the amperage preference to pull from the battery.

2 settings. I'll bet one of yours is set low.

Both are set to 32A. The only setting not maxed out is the discharge voltage in the settings for the resistor channel which defaulted to 12V. Assuming this needs to be pushed up

That's it. TTBOMK resistance doesn't mind voltage. As long as the fans can withstand it. And I'll bet they can.

DX* Programs - Balancer Use
 

Does the DX8 use the balancer in LiPo discharge mode and LiPo storage mode?

Hi,

I'm about to pull the trigger on a DX8 charger + 480W power supply.
My question is, does the power supply capacity will suffice ?
I live in France where we have 220V power lines.

Suffice for what? It depends on what you want to do with it. Charging two 2S LiPos with 20A? Yes, it will do that. Same with 30A? No, it won't. Two 4S on 15A? Also no. So what are your requirements?

You are right, I should have provided you with the specifics.
I'd like to cycle a 2s lipo pack at 30A and power a tyre warmer.

Well one 2S at 30A needs 252W - no idea how much a tire warmer uses, but my guess would be quite a bit less, so that should work just fine. (Unless I'm totally wrong about the tire warmer).

All right thank you for your answer. The tire warmer needs roughly 9A. So indeed this should do it.

Does cycling at 30A make a huge difference compared to 40 ?

When using the two channels independently, the charger can absorb a total of 90 watts (45 watts x2).​​​​​ The 70-watt limitation is when the charger is used in synchronous mode - both channels bridged into a single channel.

Correct. It's about 90 watts (45 watts per channel). See above.

No, the small gain of a high current charge compared with a normal like 2C charge can only bet noticed if you can run a heat/final flawless, one mistake and the gain is gone. The difference between 30 and 40A will be much smaller. It is also depending the battery, if you use 4200mAh shorties or 8500mAh normal size packs.

I'm using 2s lipo stick with 6300 mAh.