adding table with inverter models which don't support QPGSn command e…

…ven they can run in parallel mode (#251)

* adding table with inverter models which don't support QPGSn command even they can run in parallel mode

---------

Co-authored-by: Nikolay V. Krasko <nikolay@enapter.com>

solar_inverters/mpp_solar/mpp_solar_fw/commands.lua

@@ -41,6 +41,9 @@ local commands = {
   device_protocol = {
     command = 'QPI',
   },
+  device_model = {
+    command = 'QMN',
+  },
   general_parameters = {
     command = 'QPIGS',
     data = {

solar_inverters/mpp_solar/mpp_solar_fw/mpp_solar.lua

@@ -4,6 +4,7 @@ mpp_solar.baudrate = 2400
 mpp_solar.data_bits = 8
 mpp_solar.parity = 'N'
 mpp_solar.stop_bits = 1
+mpp_solar.no_qpgs = { 'VM-3000', 'MKS2-5000' }
 
 function mpp_solar:run_with_cache(name)
   if mpp_solar:is_in_cache(name) then

solar_inverters/mpp_solar/mpp_solar_fw/parser.lua

@@ -11,6 +11,7 @@ local output_mode = commands.output_mode
 local device_warning_status = commands.device_warning_status
 local serial_number = commands.serial_number
 local priorities = commands.set_priorities
+local device_model = commands.device_model
 
 local parser = {}
 
@@ -173,14 +174,20 @@ function parser:get_connection_scheme(max_parallel_number)
 end
 
 function parser:get_max_parallel_number()
-  local result, data = mpp_solar:run_with_cache(device_rating_info.command)
-  if result then
-    -- enapter.log('device rating info: '..tostring(data))
-    local max_parallel_number = split(data)[device_rating_info.data.parallel_max_num]
-    if max_parallel_number == '-' then
-      return 0
-    else
-      return tonumber(max_parallel_number)
+  local result, data = mpp_solar:run_with_cache(device_model.command)
+  if result and has_value(mpp_solar.no_qpgs, data) then
+    enapter.log("Inverter doesn't support parallel mode")
+    return 0
+  else
+    local result, data = mpp_solar:run_with_cache(device_rating_info.command)
+    if result then
+      -- enapter.log('device rating info: '..tostring(data))
+      local max_parallel_number = split(data)[device_rating_info.data.parallel_max_num]
+      if max_parallel_number == '-' then
+        return 0
+      else
+        return tonumber(max_parallel_number)
+      end
     end
   end
 end
@@ -198,4 +205,14 @@ function split(str, sep)
   return t
 end
 
+function has_value(tab, val)
+  for _, value in ipairs(tab) do
+    if value == val then
+      return true
+    end
+  end
+
+  return false
+end
+
 return parser