Hello, I have a similar problem - mine is campervan conversion on NISSAN NV2500 SV High-Roof (4.0 Liter 6 cylinder). Would there be any problems upgrading the alternator to a high output 250a or 360a alternator? Also, is there a brand that you would recommend for a Nissan NV2500? I currently have a Renogy 60a DC to DC charger that would charge 3 Renogy Lithium Iron Phosphate batteries 170a each (Total 510a), Warn 12,000 lbs winch, on-board air tank, driving camera, reverse/fog lights. I've also upgraded the car battery to a Optima yellow top but for some reason the alternator wouldn't charge the car battery however, the I minute i disconnected the DC to DC 60a charger it would start to charge. I appreciate any recommendations you may have. Thank you.
