collectd.conf

LoadPlugin modbus
<Plugin modbus>
 <Data "panel-voltage-input">
   RegisterBase 12544
   RegisterType Uint16
   RegisterCmd ReadInput
   Type voltage
   Instance "panel-voltage"
   Scale 0.01
 </Data>

 <Data "panel-current-input">
   RegisterBase 12545
   RegisterType Uint16
   RegisterCmd ReadInput
   Type current
   Instance "panel-current"
   Scale 0.01
 </Data>

 <Data "battery-voltage-input">
   RegisterBase 12548
   RegisterType Uint16
   RegisterCmd ReadInput
   Type voltage
   Instance "battery-voltage"
   Scale 0.01
 </Data>

 <Data "battery-charging-current-input">
   RegisterBase 12549
   RegisterType Uint16
   RegisterCmd ReadInput
   Type current
   Instance "battery-charging-current"
   Scale 0.01
 </Data>

 <Data "battery-percentage-input">
   RegisterBase 12570
   RegisterType Uint16
   RegisterCmd ReadInput
   Type percent
   Instance "battery-percentage"
 </Data>

 <Data "battery-charging-power-input">
   RegisterBase 12550
   RegisterType Uint32LE
   RegisterCmd ReadInput
   Type power
   Instance "battery-charging-power"
   Scale 0.01
 </Data>

 <Data "load-voltage-input">
   RegisterBase 12556
   RegisterType Uint16
   RegisterCmd ReadInput
   Type voltage
   Instance "load-voltage"
   Scale 0.01
 </Data>

 <Data "load-current-input">
   RegisterBase 12557
   RegisterType Uint16
   RegisterCmd ReadInput
   Type current
   Instance "load-current"
   Scale 0.01
 </Data>

 <Data "load-power-input">
   RegisterBase 12558
   RegisterType Uint32LE
   RegisterCmd ReadInput
   Type power
   Instance "load-power"
   Scale 0.01
 </Data>

 <Host "tracer">
   Device "/dev/ttyS2"
   Baudrate 115200
   UARTType "RS485"
   Interval 1
   <Slave 1>
     Instance "tracer"
     Collect "panel-voltage-input"
     Collect "panel-current-input"
     Collect "panel-power-input"
     Collect "battery-voltage-input"
     Collect "battery-charging-current-input"
     Collect "battery-charging-power-input"
     Collect "battery-percentage-input" 
     Collect "load-voltage-input"
     Collect "load-current-input"
     Collect "load-power-input"
  </Slave>
 </Host>
</Plugin>