doc: add power limitation

README.md

@@ -18,7 +18,11 @@ usage
 limitation
 ==========
 
-Features I already implement:
+The built-in 5V DC-DC converter is only rated up to 5A, limiting the total maximum output to 25W.
+This means you can power up to 5 m of WS2812b 30 LEDs/m strip at full brightness.
+For more, limit the brightness in WLED, or use multiple boards and chain them.
+
+Features already implemented:
 
 - daisy chain capability (providing data and power)
 - built-in power 5V power supply (input up to 36V, output up to 5A)
@@ -32,15 +36,15 @@ Features I already implement:
 - external WiFi antenna port, by using the I variant of the ESP32-S2-WROOM, with appropriate connector
 - PCB fitting in [sonoff waterproof enclosure](https://www.sonoffegypt.com/products/sonoff-ip66-waterproof-case)
 
-Features I might implement:
+Features that might get implemented:
 
 - microphone/line in for sound reactive (use [ESP32-LyraT-Mini](https://docs.espressif.com/projects/esp-adf/en/latest/design-guide/dev-boards/board-esp32-lyrat-mini-v1.2.html) design as reference)
 - RDM support (mostly software support)
-- automotive fuse protection
+- automotive fuse protection (input or output protection)
 - high voltage input (up to 60V, using TPS54560DDAR)
-- reverse polarity input protection (but not output)
+- input protection (reverse polarity, PPTC)
 
-Features I will not add:
+Features will not be implemented:
 
 - XLR DMX512 connectors: they take too much space and I never know if I should use the 3 or 5-pin variant. Instead I will design a separate DMX + power injector splitter board
 - full isolation: not really needed as the devices should be chained with a single power supply, preventing any ground potential difference. The splitter board will provide isolation, at the beginning of the chain.