Some time ago, Joebog1 pointed out the availability of some ready-made DC-DC modules 8-32 V in, 45-390 V out, online for £1-74 (they've gone up to £2.03 now)
https://www.aliexpress.com/item/3295...4d1f4c4dv69dFH
Not sure how much time and money the PE projects will absorb
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B