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hi

everyone jeff cote here with

boatingtechtalk.com

all right so we've got a question from

a fellow motor stormer asks jeff

regarding the victron smart battery

protect what kind of voltage or battery

percentage do you usually set out

for the cutout at it's just a single

house battery at 120 amp hours

tough question good one but tough mmm

okay so we all know

that um generally for flooded lead acid

batteries

generally the floor is about 50

of dod depth of discharge so 100 full

battery

zero percent full battery 50 right in

the middle is sort of a

healthy sort of point where you're going

to have reasonable amount of cycles

and a reasonable amount of depth of

discharge naturally if you

discharge your battery only from 100 to

90 percent you'd have way more cycles

but you're constantly having to recharge

so it's all about finding that balance

between

you know just stopping discharging your

battery at 90 or stopping discharging

your battery at zero

and generally the compromise with

flooded lead acid batteries is about

50 now we also know that agm batteries

which are absorbed glass mat batteries

still let acid not flooded right so

in here with an agm battery the

electrolyte is in a glass mat

you can go deeper on the depth of

discharge some folks are going to bring

it down to 30 percent

and it's going to be for them a way to

compromise get more usable batter

battery out of the battery or capacity

and doing so knowing that they're going

to sacrifice

battery life because remember the deeper

you go on the discharge

the harder it is on the battery okay

fine

so where do we set ourselves for this

sort of

alarm or this set point i would say

that anywhere between 30

and 50 it really depends on how often do

you go to 50 and how often do you go to

30

if you never go to 50 and you always

stop discharging your battery around 60

some of the boaters that i know stopped

discharging even at 70 that's their

choice

well then maybe 50 is plenty right

because you don't want to have

something constantly alarming because

over time

uh you're gonna start disregarding that

information so you want this to be

exceptions

right like it never happens and when it

does you react to it

so maybe if you're discharging your

battery to 60 70 percent

and rarely to 50 then maybe put 50 as

the threshold

or you might be going to 50 40 35 all

the time

then set 30 percent of the threshold and

again

you always want to give yourself a

buffer right it's a little bit like a

gas tank

you know the gas tank might be rated at

70 liters let's say

but there might be your gauge is giving

you

says zero but there's still a little bit

more fuel in the tank

the lowest i would think is reasonable

for an agm battery

and this should never happen but when it

does it's serious and there's no turning

back meaning you've got to deal with it

right away

would be 20 so it cannot be lower than

20 but that's pretty damn low

so maybe bring it to 30 and if you don't

use your battery as deep then maybe stop

at 50.

so good question but there's no easy

answer there's no right

answer and a wrong answer it really

depends on how you use your battery bank

every day so great question stormer

thanks for asking

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