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10cm is enough. But if that's a problem, you can also remove the top cover and mount them close to each other.
https://www.victronenergy.com/upload/documents/Manual-Quattro-5k-8k-10k-15K-100-100A-230V-(firmware-xxxx4xx)-EN-NL-FR-DE-ES-SE-IT.pdf
Hi Ebrahim,
See my thread where I asked basically the same question. There have been some good answers but there doesn't appear to be any designs that optimise to limit temperature derating. In short, the recommendation was simply to install air conditioning or forced air if concerned.
https://community.victronenergy.com/questions/17555/cooling-for-9-x-quattro-15kva.html
Additional resources still need to be added for this topic
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