bob power and factorio extended plus power are now failing if used together since the new update 0.17.53.
The two mods were working fine together before but now the error is:
62.296 Mods to disable:Failed to load mods: Error while running setup for entity prototype "solar-panel" (solar-panel): next_upgrade target (solar-panel-2) must have the same bounding box.

Mods to be disabled:
• bobpower
• FactorioExtended-Plus-Power

I presume this is due to the new change they made in 0.17.53:
Fixed that the game would allow entities with different sized bounding boxes or collision masks to be upgraded. (https://forums.factorio.com/72698)

Jimmy fixed factorio extended plus power with https://github.com/jimmyjon711/FactorioExtended-Plus-Power/commit/832d256ac6bbaaeafefe1cf01fd76d4cf65802ae
Might not need to change anything in Bob's power.

just verified and indeed the fix Jimmy did in f++ power fixes the issue.

I'm guessing he changed the bounding box of the base game solar panel for some reason.