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Hello At the moment I have a 4x86Ah 12v Yuasa sealed lead acid battery bank - they are about 4 years old. They are charged by a bit of Solar and a 3.7kW generator through a 40A mastervolt charger with room for 3 battery banks. I want to add more capacity but cant get more of the YUASA batteries and would like to fit some TROJANS T125s - I've got the space to fit another bank and don't want to ditch the Yuasas yet. I can set up a new bank of Trojans and charge them from the spare slot on the Mastervolt charger. How best should I incorperate them into the existing system? Assuming all the Neutrals joined together including the starter battery. Should i just join the two positives leads from both banks together? Thats in parrellel right? would that make 24V? would that effect charging? would that be generally stupid or Should I add a change over switch and manually swap banks when one has droped too far? Are there any good wiring diagrams for this set up? How can I use the solar to charge both banks? Most of the power ends up going through a 1 kW inverter. I hope to replace the inverter soon with a 3KW / 65A Combi - not sure how many banks the combi will support its at bimble solar under 12v inverters - but if only one then I could use the Mastervolt 40 for the other bank - I've got enough kW on the generator . I should say that this is a live aboard and we only really take to boat out to get water, pump out etc. We never run the engine to charge the batteries and don't cruise but use the generator and solar. Its fitted with a Adverk AAR but Im not sure its working and this goes through a split charger to charge starter and domestics. I can probably live without worrying so much about charging both domestic banks with the engine Any thoughts?