Hello i have a batteryseparator in my boat. I recently bought a smartshunt an MPPT charger for my solar panel and a solar panel with 120 watts. I asked an certified boat electrician to do this install, he said that he needs to rebuild the battery separator or otherwise the smartshunt will not get correct readings. He mentioned that he probably needs to redo the cables and probably also rearrange the batteries (2 of them - 1 start battery other is used for fridge, lights etc).
Is it really this much hassle to get the smartshunt installed? Or is the electrician just wanting to make extra bucks?
How should an correct electrical drawing look with this setup?