Builiding of a complete 6kW PV inverter with MPPT chargers


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-dex-
Senior Member

Joined: 11/01/2024
Location: Poland
Posts: 101
Posted: 07:52am 12 Sep 2024      

I have already written about the cabinet here:

In fact, it is a housing for office binders, appropriately adapted.

I like this style of industrial electronics, of course there are ready-made telecommunications cabintes, but new ones cost as much as a factory build inverter  

The office paper cabinet cost a fraction of the price but required welded reinforcements and something to mount electronics to. I did all this myself with an electrode welder, I'm a beginner welder, but these welds were not demanding. The paint covered any possible imperfections  

Originally, there were supposed to be 3 shelves at the bottom of the cabinet for three sets of batteries, then I reduced it to 2 shelves, and finally stopped at 1 shelf.

Now, when I think about adding more batteries, I want to place all the cells in a separate housing nearby. The problem is that I have room for another cabinet at a distance of about 8-10 m from the inverter = lots of long and thick battery cable.


If I move these blue cells to another housing, I will gain additional space, which I will probably spend on a transformer charging the batteries at a cheap night tariff - only in winter when there is no sun here. I have the E-shaped transformer shown at the beginning of the topic.

  Revlac said  
I'm also doing a cabinet with everything inside, batteries at the bottom etc, but 230vac will go to the main box on the side of the house to a generator input and changeover switch.


Every time I open the cabinet's door I feel warm. While this does not have a significant impact on electronics, batteries do not like excessive heat, because heat accelerates the aging process.

There may be a good reason to mount them separately. It's true that my batteries are decoupled and they are at the bottom, and the warm air always rises to the top.
I'll borrow a thermal imaging camera and check the heat distribution!
Edited 2024-09-12 17:53 by -dex-