A single TPA3116D2 chip is 50W into 4ohm @ 21V, two bridged is 100W but THD is 10% (horrible). its 0.1% at 25W (50W bridged). Thats continuous output so average not peak, [ V^2/R = (21*.7)^2/4 = 50W ] but realistically you wouldn't want to run it above 25W if you want to listen to it. Looking at the datasheet and the suppliers pictures on Amazon the heatsinking is marginal, barely good enough for continuous output and badly compromised airflow due to row of capacitors blocking flow at one end. The 24v/2A from the supplier's blurb is running the board at 2 x 25W a channel which is where TI recommend it for general use at <1% THD.
If you really want good sound at 200W, look elsewhere....
BTW 200W into 4ohm speakers is 16A average... thats about 30min on your proposed battery pack...
If you really want good sound at 200W, look elsewhere....
BTW 200W into 4ohm speakers is 16A average... thats about 30min on your proposed battery pack...