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hi everyone jeff cote here with

boatingtechtalk.com so we've got a

question from a fellow boater named

jeffrey

jeffrey goes on to ask jeff i've been

thinking about installing electric

motors on my 37 foot catch with solar

charging eventually i've seen youtube

sailors who have a 48 volt bank for

their motor and a separate 12 volt bank

for their house loads and others who run

both off a single 48 volt bank what are

the disadvantages of either pros and

cons i love pros and cons all right okay

so actually by the way

you know for some of you here we're

talking about having different voltages

you know the fact that it's 48 and 12 it

could also be 24 and 12 okay so it's

really about having different battery

voltages versus having similar battery

voltages

well so let's take the specific example

of 48 for propulsion and what do we do

for a house do we do 48 to keep it

simple or do we do to 12

to keep it simple there's good reasons

to do both but you can only choose one

so why would they do 4848 well obviously

it's easy to share everything 4848.

if everything's 48 volts it's easy to

have things in parallel it's you can run

one off the other you can have combined

switches there's a lot of reasons why

many of us

have

our systems all the same voltage 12 12

24 24. that being said sometimes

right and it's not that uncommon we're

seeing boats with 24 volt and 12.

now

in this instance we have 48 volts in 12.

so the the dilemma or the problem with

48 volts is you can't run everything at

48 volts

right there's not a lot of dc appliances

that are going to run at 48. so if

that's the case then you're going to

need to have a converter right some sort

of device that is going to convert 48 to

12.

now the problem with that is they're

rate limited those converters can't just

take 100 amps whatever amps when you buy

a converter you say i want a converter

that's going to go to 48

to 12.

and you're going to say the maximum

amperage so now you're having issues

when you're converting via converter

from 48 to 12

you're saying only a certain maximum of

loads are going to be able to run right

so like for example if you don't can't

find a 48 volt windlass how are you

going to run a 24 volt windlass on a 48

volt battery battery bank well you have

to do it through a converter now if you

do it through a converter are you going

to be able to find a converter that can

run

at whatever amperage you need

not obvious

not obvious right

batteries don't have a rate limiter you

know you can draw a lot of current we

know that because we start engines with

them right and so if you can start an

engine there's no rate there's no real

current limiting device on a battery

if you stick with 48 volt battery for

your house and you're gonna run whatever

loads

that aren't 48 via a converter you're

going to have a challenge

hence

but that's not to say it's a show

stopper it's going to be a challenge

hence why many boaters choose to have a

48 volt battery bank for propulsion but

then what they do is they have a 12 volt

battery bank

and how they solve the conversion issue

is now what they're doing is they're

rate limiting the conversion from 48 to

12 so you can charge

a 12 volt battery bank with a 48 volt

battery bank you can do that through

conversion but your the rate limiting

effect doesn't matter because it just

means it takes longer to run to recharge

the other battery

what's good about having a 12 volt house

or 24 volt house is now you can run a

bunch of appliances easily run 12 volt

or 24 volt appliances there are so many

appliances now that are easily doing 24

volts so that's the advantage of going

with a 48 volt for propulsion 12 volt

for house

and then having the conversion process

between the two being rate limited but

that doesn't matter because the loads

are running off respective battery banks

so pros and cons to both from what i've

seen

most boaters here

are doing 48 and then 12. now if you've

done a different setup on your boat i'd

love to find out why please share i'm

not saying there's no right or wrong

here there's pros and cons to both and

if any one of you have done something

completely different again please share

down below share how you did it why you

did it and how has it been going because

ultimately we're all here to learn so

thanks for everyone for watching

if you're curious we've written whole

articles about this go on our website

search it out

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