Lawrence Statton N1GAK/XE1 writes:
What you're saying is: You want to build a 20A 13.8V power supply with
OVP. That it happens to take 24Vdc instead of 120Vac is trivial.

Oops, just noticed the .co.uk in the OP - replace that 120 with a 240
73 N1GAK

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Lawrence Statton - m s/aba/c/g
Computer software consists of only two components: ones and
zeros, in roughly equal proportions. All that is required is to
sort them into the correct order.