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How to choose solar inverter ?

Single or three phases?

We will explain how to choose single or three phase inverter. Firstly it is important to define what is the use of your photovoltaic electricity :
- Prime case resale of electricity to the grid, most managers EDF EON kind etc... limits you to a single injection 6kw.
Beyond this power you will be strictly in phase, in fact electrical networks support less phase shifts at the time you could inject high electric power in single phase.
Network managers equilibrate each phase which is very expensive today where the limit 6kw.
- Second, if you consume what you produce :
Must consider if your home is paid in single or three phase and agree on the type of home.
Most manufacturers today have optimized yields phase inverters and therefore offer more competitive solutions in this phase that pays off the most of your installations.

Supervision : useful

The inverter manufacturers offer solutions of varying complexity for tracking the progress of your inverters, SMA addition, all manufacturers offer serial RS485 communication cards, these cards provide the connection between the inverter and recorder data, for example KACO even includes these two elements in series in the TL3 family.
It is very important to analyze the monthly and annual instantaneous production of your photovoltaic plant in effect under the manufacturer's warranty for your solar panels you are able to ensure the performance of your system.

All manufacturers now offer you a simple and comprehensive interface directly on their server which allows you to track via the internet anywhere you are located, email alerts can be set in the context of a default instance.
Manufacturers have constantly developed this solution they offer you very low cost view free (KACO, ENPHASE, SOLAR MAX DELTA, SMA)
Supervision is very useful, even vital.

What is a string?

The term string in the solar defines a group of solar panels connected in series, it is possible to connect several string on a single inverter, current attention to return on each eligible solar panels.

Connection in series or in parallel?

The voltages of series-connected solar panels are added, the current remains the same as the value of a panel. The intensity of each adds it is very important to check the intensity of the input of the inverter and its beach MPP indeed adding solar panels in series in a string you increase the voltage to reach optimum point of operation, if the desired output is not reached on the first string you will need to create a second string, the intensities will therefore add up. It is imperative that the two string is the same number of panels (using a single tracker).
Therefore where necessitated to check the maximum inverter input current, you must adjust the number of panels in series in a string and adjust your number of string depending on the characteristics of your inverter.

One or two tracker?

A tracker is a completely separate entrance to try this solution allows installation flexibility. Indeed, in the context of a dual inverter tracker it is possible to connect a number of different panels of each tracker. Take the example of an East-West installation, tracker # 1 connected to the panel IS will start producing early in the day and tracker WEST will start producing the evening.
In the framework of a simple inverter tracker, inverter take the lowest voltage and therefore the worst generation, your solar array would be curbed.
The disadvantage of this solution is its price between 10 and 20% depending on the manufacturer, as part of a standard and simple installation, the inverter dual tracker is not the most optimal solution.


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