RCT: add maxacpower (#30936)

templates/definition/meter/rct-power.yaml

@@ -13,6 +13,7 @@ params:
   - name: port
     default: 8899
     required: true
+  - name: maxacpower
   - name: externalpower
     type: bool
     description:
@@ -43,6 +44,9 @@ render: |
   uri: {{ joinHostPort .host .port }}
   usage: {{ .usage }}
   cache: {{ .cache }}
+  {{- if eq .usage "pv" }}
+  maxacpower: {{ .maxacpower }}
+  {{- end }}
   {{- include "battery-params" . }}
   capacity2: {{ .capacity2 }} # kWh
   externalpower: {{ .externalpower }}