diff --git a/research/energy/README.md b/research/energy/README.md
index fd99390..e2aadf4 100644
--- a/research/energy/README.md
+++ b/research/energy/README.md
@@ -33,3 +33,8 @@ The battery is configured as **backup only** (power cuts), on purpose: day and n
 runs on PV and the grid, so a full battery with ~0 W flow is the normal state.
 
 Fronius Symo 3.7 (`192.168.0.143`, Solar API JSON) produced another 4.4 kWh that day.
+
+Considered and rejected (2026-10-23): pointing the logger's second server ("Server B") at our
+backend. Push frames are poorly documented binary data every ~5 min, need a TCP server with
+acks, and a wrong setting could cut off the Solarman cloud my father uses. Local FC3 polling
+gives documented registers at our own rate. Server B stays empty; fallback only.