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HT Italia MPP300 Adapter for PV Testing on Multistring Installation

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The HT Italia MPP300 is an innovative accessory, used together with SOLAR300N or SOLAR I-V. It allows measuring and recording of the main parameters which characterize single-phase and three-phase, single-string and multi-string photovoltaic systems.

HT Italia MPP300 Features:

  • DC/AC TRMS voltage meas. (single-phase and three-phase)
  • DC/AC TRMS current meas. (single-phase and three-phase)
  • DC/AC power measurement (single-phase and three-phase)
  • Simultaneous measurements up to 3 strings (max 3 MPPT)
  • Connection with master unit SOLAR300N and SOLAR I-V
  • Power supply with rechargeable Li-ION battery
  • LED operating indications
  • USB port for connection to unit SOLAR300N
  • RF connection for connection to SOLAR-02 and SOLAR I-V
  • Internal memory for saving recordings
Authorised Australian Distributor
PDF Logo    HT Italia Solar brochure
PDF Logo    MPP300 Datasheet
PDF Logo    MPP300 User Manual


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HT Italia MPP300 – Accessory for measuring and recording the efficiency of single-phase and three-phase multi-string systems

The innovative accessory HT Italia MPP300is used together with SOLAR300N or SOLAR I-V to measure and record the main parameters which characterise single-phase and three-phase, single-string and multi-string (up to three strings) photovoltaic systems.

It is perfect for use in systems with three-MPPT three-phase inverter and in three-phase systems provided with three single-phase inverters.

It is provided with a practical anti-shock “field” case, lightweight and small in size.

The front panel carries the LEDs for operating information and the DC and AC inputs for upstream and downstream connection of the inverter(s).

The HT Italia MPP300 interfaces with SOLAR300N via USB connection and SOLAR I-V via wireless connection. The SOLAR300N and SOLAR I-V are used to control the settings for the MPP300 (ie. to start/stop the recordings of electrical and environmental parameters and to enable the download of the recorded values).

The common problems

The distance between the photovoltaic modules and the inverter is often considerable, and this forces the operator to carry out measurements in different places at the same time. Therefore, it would be necessary to lay long connection cables between the environmental probes and the instrument. These cables could hamper the operator’s movements and be a hindrance. This kind of connection is therefore not acceptable.

In terms of photovoltaic installations located on top of buildings, the so-called photovoltaic roof presents another problem – reinforced concrete or metal structures, etc. must be taken into consideration. These structures would make an impossible for radio (wireless) connection between the environmental probes and the instrument, because of signal attenuation.

The solution

The master instrument: SOLAR300N or SOLAR I-V is only used in the initial and final phase of recording and it does not play any active role whilst recording the electrical and environmental parameters. Therefore, while the MPP300 and the SOLAR-02 respectively record the electrical and environmental parameters of the system being tested, it is possible to use the master instrument (SOLAR300N or SOLAR I-V) to carrying out other measurements. For example, with the SOLAR I-V it is possible to measure the I-V characteristics of strings and modules.

HT Italia MPP300 Specifications:

Internal power supply Internal rechargeable Li-ION battery (3.7V, 1900mAh)
Battery duration > 3 hours
External power supply AC/DC adapter 100-240V 50/60Hz / 5VDC
Frequency range 2.400 – 2.4835GHz
R&TTE category Class 1
Max transmission power 30µW
Max RF connection distance 1m
Memory capacity 2Mbytes
Integration Period (IP) 5,10,30,60,120,300,600,900,1800,3600s
RF interface connection SOLAR I-V and SOLAR-02 units
USB interface connection SOLAR300N unit
Battery duration (with SOLAR-02) approx. 1.5 hours (@ PI = 5s) ; approx. 8 days (@ PI = 600s)
Dimensions (LxWxH) 300 x 265 x 140 mm
Weight (battery included) 1.2 kg
Protection index IP40
Reference temperature 23°C ± 5°C
Operating temperature 0° – 40°C
Allowable relative humidity <80%hr
Storage temperature -10 to 60°C
Storage humidity <80%HR
Safety IEC/EN61010-1
Safety of measuring accessories IEC / EN61010-031
Insulation double insulation
Pollution level 2
Measurement category CAT III 1000V DC, Max 1000V between DC inputs
CAT IV 300V AC to ground, Max 600V between AC inputs
Max operating altitude 2000m



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