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hi everyone welcome to another session

of votingtechtalk.com we've got a

question from a fellow voter named brian

brian asks jeff with a two battery setup

starter in-house

in conjunction with an acr

with an on off combined switch a lot of

technical words but so far acr by the

way everyone means battery combiner

so so far the client has told us he's

got two batteries a house and a starter

and he's also using a battery combiner

which from blue seas is called an acr

which means automatic combiner relay

and he also has a switch on it right

which is handy

which is on off combine switch which

means you can force it to manually be on

always off

or you can force it to

actually

work right auto

can you still use a single shot both

battery negatives on one side of the

shot and all mega loads on the other

side for use for a single battery

monitor

and then he goes on he says or would it

be preferable to use one for the starter

and house batteries to have their specs

separate

all right everyone

let's geek out about battery monitors

so

a great question for brian by the way if

you're confused about battery monitors

or you're not confused about battery

monitors you should be because everyone

is

and honestly it's a lot harder than it

looks and it might be obvious to you but

i'm telling you there's so many errors

on this subject

it's actually

you gotta draw it out you know um for

your own boat

so the reality is that what is a shot

right when we're talking about battery

monitors um we're actually talking about

measuring uh current through a device

and we do that by measuring the

millivolt differential uh between two

points on that circuit

so we know that v equals ir right and so

if we're measuring v and we know r then

we know i and i is current v is voltage

and r is resistance

so that's how battery monitors

basically figure out what the amps are

is by measuring the millivoltage

differential between two posts on a

metal bar which is called a shunt

so this shunt gives us amps and we

measure that but where we're going to

put that chunk now as brian suggested if

you were actually going to

connect both battery negatives together

on one side of the shunt and have all

loads connected to the other side

your battery monitor would effectively

be

looking at the battery bank capacity of

your house and starter s1 so you really

don't have two battery banks in this

instance you only have one

right because all loads are common to

the shunt

and the only way to really have and some

boat owners by the way have two house

batteries so it does happen

the only way for us to individually give

us the amp power capacity the abdraw or

the charging going each respective

battery

as brian leads in this question needs a

dedicated shunt

and that shunt needs to be a single

choke point right think about counting

cars on a bridge right we've all seen

that or many of us are you know i

noticed i was a little curious kid and

i've always wondered what they were

doing

bothering my parents with questions

and then understanding why are they

there why are they not somewhere else

and then over time you're a kid right

and you're like oh there's no exits or

entry points after this point it's a

choke point

right so they count the cars here

they're not counting another access

point right

because otherwise you're going to miss

cars

so you know the best place to count cars

on a bridge would probably be in the

middle you know for a fact that nobody

can bypass you right

as opposed to an entry or one exit right

because some bridges have meant the

entrance many exits and why the analogy

of many entry entrances and exits

because that's what our boats have right

batteries on boats have many connections

that bring in charge and many

connections that take a charge out

right like a bridge many inputs many

outputs and the only way for us to know

exactly

where all that current is going through

and not missing any is to be right in

the middle a single choke point and that

choke point is connected to a shunt

and the shunt tells you everything that

goes in and out of that battery

and that's why with a house and starter

battery if you want if that's a big if

if you want to have amp power capacity

and amp for each battery bank then you

need a battery monitor with its

respective shunt for both battery picks

great question brian thanks for asking

and by the way thanks for all of you for

listening in

and be safe up there if you're curious

we've written whole articles about this

go on our website search it out

and we've got a lot of other uh tech

talks about this very topic if you

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