diff --git a/CHANGELOG.md b/CHANGELOG.md
index df55052..6733114 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [unreleased]
 
+- set no of pv modules for MS800 GEN3PLUS inverters
 - add MQTT topic `dcu_power` for setting output power on DCUs
 - Update ghcr.io/hassio-addons/base Docker tag to v17.2.5
 - fix a lot of pytest-asyncio problems in the unit tests  
diff --git a/app/src/gen3plus/solarman_v5.py b/app/src/gen3plus/solarman_v5.py
index 2cf7d16..011f104 100755
--- a/app/src/gen3plus/solarman_v5.py
+++ b/app/src/gen3plus/solarman_v5.py
@@ -568,6 +568,10 @@ class SolarmanV5(SolarmanBase):
                 model = f'TSOL-MS{max_pow}'
         elif max_pow == 1800 or max_pow == 1600:
             model = f'TSOL-MS{max_pow}'
+        elif max_pow <= 800:
+            self.db.set_db_def_value(Register.NO_INPUTS, 2)
+            model = f'TSOL-MS{max_pow}'
+
         if model:
             logger.info(f'Model: {model}')
             self.db.set_db_def_value(Register.EQUIPMENT_MODEL, model)