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ers jeff gote here with another

installment of ask pys we've got a

question

by from monty monty's got a good

question actually

i know all questions are good but i love

them because i've been scratching my

head answering these questions when i

started voting

and everyone i see reminds me of the own

my own questions as i was going through

my journey of learning

about marine electrical systems so sorry

if i'm using the word good a lot

all right so the question is this if i'm

putting together a new battery bank

is there any benefit between buying

several batteries and connecting them

together

or getting one single large battery

that's already rated at the target

voltage

right so for instance let's think about

this

what's better buying a 12 volt battery

or two golf cart batteries

that are six volts and wiring them in

series

so from what i've read and what we've

seen out in the field

the best battery is a series battery

so meaning when you're buying actually a

12 volt battery you're actually not

there's no such thing as a 12 volt

battery

per se it's six 2.1 volt

cells that are wired in series to give

you

12 volts same thing with a golf cart a

golf cart battery the reason why there's

three caps

on top of the battery is it's actually

wired three batteries that are 2.1

about volts wired in series to give you

a 6 volt battery and so when you're

actually

looking and building a battery bank on

your boat if it's possible and it's not

always possible

the ideal battery bank is a battery bank

built

of multiple smaller battery voltages

to give you your target voltage for

instance um

if we're wiring a firefly battery bank

with

the 4 volt battery and i'm doing that

today on one of the boats we're wiring a

24 volt battery bank

so we'll wire six four volt batteries in

series

to give us a 24 volt battery bank and

that is to me a perfect battery because

it's a serious battery

in the old days i've seen boats that

bought batteries in 2 volts and would

literally have 12

2 volt batteries stacked in series to

make a

24 volt battery so if possible buy

batteries and small enough voltages so

that they're all wired in series

now clearly that's easier said than done

and most of the cases to be honest

we have to wire batteries in parallel

the other challenge

that needs to be considered is the

weight

you know you might be strong today but

think about your older self

10 5 15 years from now when you're gonna

actually be removing a battery from your

boat

and putting a new battery in so what i'm

encouraging boat owners to think about

is to not

install these big 8d batteries an 8d

battery weighs about 160 pounds

it's inhumane for one person to lift off

the floor

unless you're a bodybuilder and to be

quite honest

it's really hard to move these batteries

in and out of the boat so in a lot of

situations what we're doing is we're

taking a a d battery and we're actually

replacing it with

smaller batteries the reason we're doing

that is because the battery is located

in a really

inaccessible space so bringing batteries

on or off and on your boat has to be one

of the factors

that you decide on choosing how you're

going to build the battery bank

so that's one variable and the other

variable like i said is

ideally series but most of us can't just

do a series batteries it's not possible

and so in the end we build battery banks

by doing both

series connections and then parallel

connections to get the battery bank

and powers and voltage that we need

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