Thank you all for your advice; it’s been very helpful.
I’ve had an attempt at estimating the spare capacity of 60E at 17.58kw.
1x Double 60h x 16w / no fins 1,750 Watts
1x Double 60h x 95w / no fins 1,050 Watts
1x Single 60h x 175w / no fins 1,470 Watts
1x Single 60h x 80w / no fins 735 Watts...