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all right everyone uh Jeff Cote here with uh boating Tech talk we've got a question from Othello border uh named Bob Bob asked Jeff I want my alternator charge my starter battery and then to also charge my 24 volt a dual 12 volt batteries went out cruising if I purchase a three Bank isolator without work is there a better solution okay all right charging different voltages is a tough one uh there's never going to be easy if you think it's going to be easy you're going to be disappointed unfortunately a battery isolator is not a device that provides any conversion for voltages so if the input voltage coming out from the alternator is 13 14 14 4 14 6 whatever that alternator output is the battery isolator does not modify the voltage it's basically a gate valve it basically allows that voltage to reach some batteries and the batteries to not see each other is basically what it is and it's simply you know either y or uh two out one in two out or one and three out and so modification of voltage won't happen from a battery isolator what you need instead is what's called a DC to DC charging converter with uh different voltages victron makes those we have them on our website they're awesome so what I would do in your situation is I'd have my alternator charge back my starter battery and then I would install a DC to DC charging converter 12 in 24 out and what you'll have is they're pretty much rate limited these days around 30 amps Max output but depending on the size of your 12 volt battery bank that you have again it wasn't clear if it was is it a group 31 24 27 is it an 8D 4D but depending on the size of your battery bank and the size of your alternator is how you're going to go about choosing the size or the max amperage of your DC to DC uh charging converter uh and so that's going to be a decision but generally 30 amps is reasonable we've done more so some boaters are going to want to have higher and the only way of doing is stacking more of those devices and we've done that before as well so it is possible to run them in parallel to achieve a higher charging amperage if that's really important for your setup and that's about it so just remember to recap battery combiners and battery isolators do not modify voltage it's just uh it's basically a door keeper it's someone that lets traffic in and out and uh lets the direction of the flow for a battery isolator so there is flow only from one direction to another and a battery combiner is bi-directional but it's still just a door it's just a device that puts the batteries in parallel whenever it senses a charging voltage and then disconnects it when there is no charging voltage so that's think about with battery combiners and battery isolators they do not alter voltage they just share it DC to DC charging converters the Smart Ones will do more than just sharing they will modify the voltage to the right voltage either 12 to 12 or even 12 to 24 or 12 to 48 it really doesn't matter if there's multiple combinations uh check out victron they've got really good products on that thanks Bob for asking and please submit your other questions and be safe out voting so if you're curious again go on our website and find out more answers and solutions with this sort of setup and thanks for asking and thanks for all of you for listening and tuning in English (auto-generated) Videolytics    Tools  Compare SUMMARY 0 Total Views 0 Comments