From b2879f7f99b79875adee967d1627adedd88548e3 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Mon, 9 Feb 2026 09:31:02 -0600
Subject: [PATCH] Add comment explaining early guard

---
 esphome/components/pylontech/pylontech.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/esphome/components/pylontech/pylontech.cpp b/esphome/components/pylontech/pylontech.cpp
index d724253256..da44c6cb0e 100644
--- a/esphome/components/pylontech/pylontech.cpp
+++ b/esphome/components/pylontech/pylontech.cpp
@@ -56,6 +56,8 @@ void PylontechComponent::setup() {
 void PylontechComponent::update() { this->write_str("pwr\n"); }
 
 void PylontechComponent::loop() {
+  // Early return avoids stack adjustment for the batch buffer below.
+  // loop() runs ~7000/min so most calls have nothing to read.
   int avail = this->available();
   if (avail > 0) {
     // pylontech sends a lot of data very suddenly