Pylon madness off grid with 10 KVA
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Wow!
What is your total battery storage capacity?
Curious why you chose so many small batteries ahead of the larger models?
Curious why there is no ventilation.
From the looks of it is on a garage or basement and basements are cool and pretty constant in temperature.
Also, from the light shadows, there is a big door or opening towards the outside world.
But I may be wrong… 
Probably because those batteries are produced / sold in his country, by a local company, so easy to source and also the warranty is convenient.
Also looks that they are from different periods of time and therefore constraints of type.
Easier to have from the same type, instead of different types from different time periods.
I, for one, leaving aside the small loss in efficiency, prefer to have many smaller batteries than a few bigger, because when one is malfunctioning, less capacity is lost.
But again, I may be wrong…
jajajaj OK Alex you are ok on all your comments
There the temperature is not a problem and it was after three batt ampliations.
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My system with Pylontechs is also located in a basement of 64m2. Even with space between the batteries the temperature reached a maximum of 29°C this year and the basement was heated up to 21°C.
Furthermore, in a basement you want a optimal cooling.
What was the maximum temperature reached this year? And are you using DESS?