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so we've got a question from david

uh david asks a question i get a lot and

actually

if you're confused welcome to the club

we all are and it relates to battery

isolators right so what's the concept of

a battery isolator

battery isolator is really a way for

a alternator and if you look at this

diagram it's right here

the alternator is right here and the

alternator notice how i'm using actually

directional arrows to sort of

convey that the current is going one way

with a battery isolator

you'll notice the current is coming from

the alternator

into the battery isolator now in turn

this battery isolator takes

that power that comes from the

alternator and it sends it

one way to the engine battery and

another way to the house battery

now a lot of people think

and they're mistaken they think that

that battery isolator somehow

regulates the voltage coming from their

alternator to multiple battery banks and

that it's

individually manipulating the voltage

and saying

oh my engine battery needs this voltage

my

house battery needs voltage and it's

modifying a battery isolator does not do

that

it doesn't it's a device that can share

the current from the alternator to

multiple battery banks but it doesn't do

so intelligently in a way where it's

modifying

the voltage to each battery bank it

can't

it's not that sophistic it's not a

computer right it's basically like in

plumbing it's like a gate valve it

basically

allows neither the engine battery nor

the house battery to see one another and

have a look here on the diagram and this

is really interesting

notice how the arrows right the arrows

are directional

there is no way for the house battery to

be able to see the

engine battery or from the engine

battery to be able to see the house

battery

because the current goes alternator into

the isolator

and then isolator goes to the engine

battery

and then goes to the house battery so

when you're installing a battery

isolator effectively if your batteries

have different chemistry and one of them

is flooded and the other one is agm

you're going to have to decide on your

alternator if

it has an external regulator you're

going to have to decide am i going to

charge to agm am i going to charge to

flooded am i going in the middle

but you're going to have to make a

decision because that alternator can

only charge

to one charge profile and a battery

isolator will not manipulate the voltage

it will allow both batteries to get a

charging voltage

they can't see each other but it's not

manipulating the voltage it's just

sharing the voltage if you're looking at

actually having

a battery get a different voltage in

another battery you're talking about a

dc

to dc charging converter victron makes

them they're really great

we're going to have a whole new video on

that and that's a separate thing

but a battery isolator does not

manipulate voltage and it only allows it

to share it

so there you go thank you for watching

this

pys video if you've got further

questions please ask it below or contact

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thanks again for watching

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