All sorted now. Looks like human error potentially or renogy being very 'touchy' - two elements checked additionally:
1. changed fuse from the one that came with the fuse mounting (I didn't trust it in the first instance)
2. noticed my error - I switched off main switch and switched it back on within 10 seconds - there was over 15A on the lead and further added by swiching back on - fuse blown. Unusual I know but verified with clamp meter, just to be sure - created surge therefore.
3. I have changed inline fuse to midi one anyway just in case so I do not have to come back to it again.
@Dellmassive - thank you for pushing me to check futher with clamp and settings!
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