60% duty factor, is a rating based on the assumption that the total rated current will not be in effect for 100% of the time.
For example for all four motors the 100% rating would be 8.6Kva and 5.75 for 60%.
This is for 120vdc using 27,000µfd for 5% ripple.
You might squeek by with a 1Kva for each, but watch the heating effect.
Toroids are a slightly more efficient.
But I would look at using the existing ones first, maybe.