I have 3 quattro´s 15000VA connected in parallel configured for ESS self consumption with OPZV bateries (1200AH). I have connected mains on AC2 and a 20 KVA generator (Perkins/Stamford) connected on AC1. When I start the generator the system most of the times changes constantly between PASSTHRU and BULK. Sometimes for some minutes it can stay constantly charging the batteries in BULK, but sudenly goes to PASSTHRU and stops charging the batteries. This situation does´t allow to charge batteries with generator. I have already changed the grid codes on VE3 configure but i have got no changes on this behaviour. Does anyone have and idea for solving this issue? Many thanks!