Each of the 4 panel strings has its own protection, for three-phase 25 kW systems; includes the sealable meter box of 355 x 225 x 140 mm.
A photovoltaic protection panel does two simple things: it shuts down the installation when needed and blocks faults - short circuits or voltage peaks - before they reach the inverter and the rest of the building. It covers both the path between the panels and the inverter and the one between the inverter and the main board. In large systems, where the panels are divided into several strings, each string enters protected separately.
The set is intended for three-phase installations with an inverter of approximately 25 kW and a photovoltaic field distributed over 4 strings. The string structure matters at powers above 20 kW, where the currents and the number of modules increase: a fault on one string no longer affects the whole field, and diagnosis is done per circuit, not over the whole installation. On the alternating current side, the panel provides the separation point for maintenance and for emergency disconnection. The meter box delivered together with the panel is made of hard plastic, resistant to dust, humidity and mechanical shocks, has dimensions of 35,5 x 22,5 x 14 cm and special holes for the application of seals by the distribution operator, according to the prosumer connection procedure.
Product code 25-AC/DC-4str-tri, three-phase grid 3P+N, system/inverter power 25 kW, 4 DC string inputs, each with its own protection circuit against overvoltages and short circuits. The AC section protects the circuit between the inverter and the main board against short circuits, overloads and overvoltages, on a 3P+N grid. Sealable meter box of hard plastic, 355 x 225 x 140 mm, with holes for seals; intended use: on-grid photovoltaic systems of the prosumer type.
Suitable for a small company or a large residential property with a three-phase connection and a system of about 25 kW, with the panels organised in four strings.
| Product code | 25-AC/DC-4str-tri |
|---|---|
| Grid type | Trifazat (3F+N) |
| System / inverter power | 25 kW |
| DC inputs (strings) | 4 |
| DC protections | împotriva supratensiunilor și a scurtcircuitelor |
| AC protections | împotriva supratensiunilor, fluctuațiilor și a scurtcircuitelor |
| Meter box | sigilabilă, plastic dur, cu orificii pentru sigilii |
| Meter box dimensions | 355 x 225 x 140 mm |
| Intended use | sisteme fotovoltaice on-grid / prosumator |
Generic product — standard specifications
The set (product code 25-AC/DC-4str-tri) includes the AC/DC protection panel for photovoltaic systems and the sealable box for the meter of the distribution operator, being intended for three-phase installations with an inverter of approximately 25 kW and a photovoltaic field distributed over 4 strings.
On the direct current side, each of the 4 strings enters the panel through its own protection circuit against overvoltages and short circuits. This per-string structure is important at powers above 20 kW, where the currents and the number of modules increase: a fault on one string no longer affects the whole field, and diagnosis is done per circuit, not over the whole installation.
The alternating current section protects the circuit between the inverter and the main board against short circuits, overloads and overvoltages, on a three-phase 3P+N grid, and provides the separation point for maintenance and for emergency disconnection. The panel thus manages the fluctuations and overvoltages on both energy flows and allows the control and verification of the operation of the system.
The meter box delivered together with the panel is made of hard plastic, resistant to dust, humidity and mechanical shocks, has dimensions of 35,5 x 22,5 x 14 cm and special holes for the application of seals by the distribution operator, according to the prosumer connection procedure.
The module that gives a Huawei inverter internet through a SIM card, where the fixed network does not reach. It plugs into the USB port, serves up to 10 inverters, IP65.
The meter that tells the Huawei inverter how much the building consumes, so that it does not send current into the grid. Three-phase, up to 250 A per phase, through the included current transformers.
The single-phase meter that measures at the connection point what comes in and what goes out, so that the Huawei inverter can limit the injection into the grid. Direct connection up to 100 A, consumption below 1 W.
It shows in real time how much energy enters and leaves the house, so that the installation can regulate itself. Indirect measurement with 3 clamps of 100 A, accuracy ±1%, DIN rail mounting.
