I'm looking for input on how folks charge their house battery banks. I have P&S 24v banks for engine starting and some hi amp systems like BT and windlass. These are charged by 24v engine mounted alternators and a 24v charger fed by A/C from shore or gen. Then I have a 12v house bank for a bunch of other stuff (gen starting, lights, downriggers, heads, pot puller, heat circuit, etc). This is bank is 4x group 31 AGM batteries. Currently the only way the house bank is charged is from an A/C fed charger with power from a gen or shore. Whereas this works because I always have a gen running it gives me a single point of failure if the charger quits. I would really like to be able to charge this bank from an engine source while running but CAT does not offer a secondary alternator option. So the options I see are: 1) Do my own custom on engine 12v alternator and drive off the crank 2) Find a PTO alternator to drive off the live PTO on the ZF gear 3) Use a 24v to 12v battery to battery charger and charge the 12v house bank from the 24v starting bank 4) install a secondary, back-up A/C fed charger. Any other ideas? What are others doing for this? The gens have 12v alternators but Northern Lights says they are not recommended to charge a house bank like I have and are mainly just to charge a gen starting battery. Thanks in advance for any input.