INVOLAR Micro Inverter MAC250

The INVOLAR micro inverter MAC250 is a very advantageous and cost-effective approach to deploying truly modular solar PV systems.


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The INVOLAR MAC250 micro inverter converts DC collected from a single solar panel into AC, later transports it to the grid, and, if equipped with the optional data transmission unit, monitors the power generating data.

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The following steps should illustrate the basic working principles behind the INVOLAR micro inverter that has apparently been copied by the Chinese from the Enecsys micro inverter technology outlined here. The Involar model MAC 250, not surprisingly, works according to the same principles which are outlined by the manufacturers below:

Step One

Solar photovoltaic modules convert light energy to direct current through the photoelectric effect.

Step Two

Micro inverters attached to photovoltaic modules finish the DC-AC conversion process.

Step Three

Synchronize and transport energy to the grid through phase-lock technologies with speed and precision.

Remark 1:Independent modules supported by micro inverters (250W) could form a parallel connection for a larger power requirement
Remark 2:MIS =Micro Inverter System

Involar MAC250 Micro Inverter Features

  • Maximizes energy harvest – Different from conventional centralized inverters, M250 micro inverters conduct per-module MPPT, maximizing the efficiency of each single module with a consequent 25% increase in energy harvest.
  • Applicable to various conditions – M250 micro inverters allow for mismatch of photovoltaic modules, and each module can make flexible reactions to obstruction shading, inter-row shading, and obstacles such as dust or debris to avoid a sharp decrease in system efficiency.
  • Improved safety – With the built-in DC-AC conversion function, M250 micro inverters avoid dangerous HV DC circuits necessary to photovoltaic systems supported by conventional centralized inverters.
  • Fast problem diagnosis & solution – With PLC (Power Line Communications, i e electricity network) or WiFi technology, it is convenient to maintain real-time monitoring of every single module in the photovoltaic system.
  • Low failure rate – M250 micro inverter’s distributed framework ensures no single point of failure that would result in bringing the whole system down.
  • Plug-and-play installation – Free from the HV DC circuit, photovoltaic systems supported by M250 micro inverters could have fast, easy, and safe installation by allowing for PV module mismatch, a 15-25% decrease of installation time and cost, and flexibility in the changing of systems.
  • excellent INVOLAR M250 micro inverter is the result of the technical design with a high efficiency in its standard of air power supply, high power density, and high reliability.
  • By making use of the resonance soft-switching technology in MAC250 micro inverter’s main circuit, the switch frequency reaches near thousands of kHz, reducing wear and tear of the switch.
  • small, lightweight, high frequency transformer that achieves electrical isolation, power conversion, and high power density.
  • intrinsically safe current source hardware topology and high reliability.

Micro inverter technology by INVOLAR has resulted in a revolutionary device that is fully integrated into each individual module, converting DC to AC at the module level, with an independent MPPT function. INVOLAR’s micro-inverters outperform centralized inverters in:

1. Module-level Maximum Power Point Tracking (MPPT) with Involar Micro Inverter M250

Different from the conventional centralized PV inverter, the micro inverter enables each individual module to achieve MPPT, which allows for module mismatches and can harvest more solar power.

2. Involar Micro Inverter MAC250, Increased Efficiency during the System’s Life Cycle

With any micro inverter technology, the photovoltaic system receives a dramatically higher power output, more than 25% additional energy harvest in a less-than-ideal environment with possible obstruction shading, inter-row shading, and obstacles such as dust or debris.

3. Involar Micro Inverter MAC250, Intelligence and Reliability

With the distributed micro inverter framework, there is no single point of failure, which means that failure of any module will only affect its own performance and will NOT affect the other modules’ performances.

Involar’s unique Power Line Communication (PLC) and internet technologies enable real-time monitoring of every single module in the photovoltaic system for fast diagnosis and solution to a problem, thus improve reliability and system uptime. We recommend switching off the integrated WiFi transmitters and use powerline communications instead in order to avoid potentially harmful EMF exposure; shield powerlines if necessary in order to insulate against powerline-transmitted high frequency signals. The full set of monitoring features is still available when using the less hazardous PLC and cable-Ethernet data transmission.

The INVOLAR remote monitoring system is based on a so-called ETU which is in effect a piggy-back box containing a data transmission unit. This unit is locked to transmit data to the manufacturer’s central data base on a proprietary protocol using internet protocol (high port 7001). If micro inverter user employs any sort of meaningful firewalling policy (blocking transmissions from the inside over non-standard ports) or if you just feel uneasy (actually, we do somehow…) to send your private solar energy data to some black box located in China and Chinese-controlled, you may want to use the “naked” micro inverter or multiple micro inverter units only.

Internet usage directives and Netiquette require every internet user to save bandwith and not flood the network or cause any jams by unnecessary usage. Transmitting a continuous data stream all the way to China is not exactly in line with proper internet use or common sense.

INVOLAR micro inverters can as well be run, and their other technical advantages such as increased output per panel can be used, without remote monitoring and without the “ETU” add-on. In order to lower installation cost — and in light of the above security considerations — you might be well-advised or simply want to go for such a bare-bones solution.

We do provide both solutions as an option, but feel it is our duty to be fair and raise the issue above for everyone to decide for themselves. In a simple consumer or Home Power setting the above issue may be less significant.

With or without the ETU the Involar M250 micro inverter enhances both modularity and configurability of solar PV arrays and, by eliminating DC line resistance, increase performance per solar panel up to 25%. Using a micro inverter, both accessory unit cost and maintenance cost can be decreased significantly in solar PV systems.

The Involar MAC250 micro inverter may also be used with micro wind turbines and is suitable for models from 50 W up to approx 1000 W rated power (depending on actual local wind conditions) when connected to a suitable regulator (or diversion or dump load). The Involar MAC250 micro inverter is currently undergoing tests with LE-v50, LE-300 and the Airdolphin DC turbines.

2 thoughts on “INVOLAR Micro Inverter MAC250

  1. Joe Rossini

    I am attempting to build a small solar power grid tie system, only 250 watts, but I am using multiple panels all the same. Is there a solution for me that is affordable and UL approved???

    1. admin

      Dear Joe,

      thanks for your message. Both our line inverters such as SMA SunnyBoy and micro inverter models are suitable for grid-tie setups, and are available with UL approval (for North American model versions) and other local certificates (other regions). For the setup you described, rather than the product on this page, a dual-input micro inverter might be suitable; for example, one of the Enecsys Dual micro inverters. These “dual-input” micro inverters are designed with two PV panel connectors per unit. Either a max 360 W or 480 W version are available.

      If these are too “big” for your purposes and if cost is an issue in order to make such a small system economical, your best bet might be a low-cost inverter as found in car accessories stores; some models might be UL-certified, depending on local offerings. Canadian manufacturers Xantrex also include smaller sized models in their range of products, as do Outback, though at a higher price than a simple auto-parts solution.

      To check out a sample for those dual-input micro inverters please go to details and specs for the DUAL versions scheduled for later this month) or click for a more comprehensive description text.

      Hope this helps — and thanks again for getting back to us!

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