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jeff cote here with ask pys  so we've got a boater he's got a cnc  sailboat and he's got three battery  banks so  he's all set up he's got battery  combiners which are you know could be  called acrs  or vsrs he's got switches  but you know the problem is he this this  boarders wanting and his name is graham  graham is looking to connect or have a  battery monitor tell him what is this  battery capacity  on his three battery banks and he's  wondering and asking is there a way to  have a single battery monitor  something like this right  and i've got two here i've got a xantrex  link light  or i've got a victron one right  right so this is a victron battery  monitor zandrax  there's other brands too these are two  these are common choices that we have  can i have a battery monitor monitor  three battery banks  now most battery monitors  will give you an option of measuring  voltage on a secondary battery bank  voltage but not amps and not  basically capacity so you're only ever  able to see  and this is the key amp hours battery  capacity which is a percentage  volts and amps off one battery bank  and the auxiliary battery bank you'll be  able to get voltage  so if you were a voter that had for  example and this happens  maybe you've got an inverter battery  bank and you have a house battery bank  you'll actually need two battery  monitors and on some bigger boats  you know some bigger boats have four  battery banks and they're we're  installing  literally not engine we normally  wouldn't put a battery monitor on an  engine battery because the voltage is  enough  but if you want to geek out sure i've  seen you know salines and north ovens  where they have a battery monitor on  everything  now that's pretty uncommon and most of  us are not going to do that and i  haven't even done that on my own boat  but i'm always always going to have a  battery monitor on every single deep  cycle battery  because as a boater we need to know what  is the depth of discharge of that  battery  because depth of discharge equals  directly to battery life  and number of cycles and the other thing  that's really important and what's great  about these battery monitors is they  tell you  the opacity going in and out of the  battery  so you can say you know maybe my battery  is draining minus 11 amps or maybe i'm  recharging at plus 42.  you want to know sort of like a car the  rate at which  you're actually either pulling energy  from your battery or actually  putting back in the battery and a shunt  from a battery monitor is going to give  you that ability  so basically if you've got multiple deep  cycle battery banks you need to have  multiple battery monitors  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