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hi  jeff gote here with pacific yacht  systems uh we're doing another  uh ask pys and this time we've got a  question from jamie so jamie  asks jeff i've been wondering and can  you help me i've got a 48 volt battery  bank  uh so that's generally happens with  boaters that are looking at electrical  propulsion  on my boat and it has two alternators on  it okay all right so this engine has two  alternates and it's 48 volt volt so  that's pretty  unusual want to start and want to change  the battery bank  but the alternator is only 12 volts so  obviously the engine battery is most  likely 12 volts  and the starter is probably 12 and the  alternator one of them will both  alternatives are 12 volts and the  question is how do you recharge  a 48 volt battery bank if you've got 12  volt alternators can you put a dc  to dc basically converter to charge  from a 12 volt alternator to 48 volt  alternator  it's a good question we like i said see  this a lot with electric propulsion now  in this case  jamie here doesn't have electrical  propulsion that's why he's got  alternators  what i would do is i yeah i agree his  suggestion was to probably  change one of the 12 volt alternators to  48 and that's what i would do too  i'd have if i had the ability i'd have  two alternators on my engine one for 12  one for 48  and then um that way you don't have to  do a dc to dc converter dc-dc converter  and in this instance  he has a 180 amp 12 volt alternator  it's going to be really challenging you  know where are you going to find a dc to  dc converter that can handle that  sort of average like when we do dc to dc  it might be 20 30 40 50  60 but 180 amps is just over the top so  it's way better  to just go straight 48 volts from an  alternator  directly to a 48 volt battery bank so  that's a good question from jamie thank  you for watching this video  if you've got further questions and  you're wondering about your own boat  please ask questions below or send us an  email with your questions and we'll get  to them  hopefully as soon as possible if you haven't done so please subscribe  to our youtube and get our weekly  updates we're posting about four videos  a week right  now and also thanks for watching