HTRC T400 spec question

[Guy48065]

I bought a low miles used T400 Pro charger and I have a question about how they state the charge/dis wattage specs.
When calculating the watts are they using the pack voltage or the charging voltage?
9.3 peak pack volts vs ~29 charging volts makes a huge difference in the watts limits.

I'm skeptical this little thing can handle 400W on DC power.

 

[tntpoof]

try using OHM's law. then see if it could handle

 

[olds97_lss]

I do the math off nominal voltage usually, so 3.7V and it seems to be pretty close with my chargers. One of my chargers is a 4x100w/4x10A charger. With a 5000mah 3S pack at storage (3.85V*3=11.55V), I set it to charge at the full 10A, but it throttles itself to around 8.6A. So, it's still more than 1C for my 3S packs.

For my 4S and 6S packs, I use different chargers and usually parallel charge at 15A for 2 packs (1.5C roughly). Those chargers I use for those packs are 20A/500W.

So, with that in mind, if you set your charger up to a peak of 12A, then plug a 6S pack into it that is at storage, it will likely throttle itself to around 8.5A as you will hit the 200W limit on the channel. If you were charging a 2S pack (at storage of 3.85V per cell), your charger would hit the current limit instead of the wattage limit, 3.85V*2=7.7V. 7.7V*12A=92.4W.