John wrote:

Just curious (not clever enough to work it out) but why are 3 phase
chargers more powerful than single phase fed ones?

Is it just that the mains circuits have different capacities or is a 3
phase when rectified more powerful?

I think it is just because a standard house single phase supply is only
going to provide a maximum of 10kW to a single circuit using standard
components. If one needs a higher power supply it is going to cost a
lot and is routinely supplied as three phase to make the best use of the
available supply cables and standard components.

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Roger Hayter