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Old 03-26-2019, 08:03 AM   #1
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How to connect 24v to 12v step down?

Trying to figure out where to connect the step down converter to my system and also if i need any type of fuse going into the converter? Do i need some type of terminal before the inverter, do go directly to the batteries?

Any help greatly appreciated.
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Old 03-26-2019, 08:18 AM   #2
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I would run a 12V distribution panel and/or multiples of them in strategic locations.

All depends on amps required and where.

Every wire should be protected, close as possible to the source side.

Blue Sea makes great stuff.
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Old 03-26-2019, 08:35 AM   #3
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I would tap into 24V between battery and fuse for inverter with the correct size fuse for the converter.
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Old 03-26-2019, 09:34 AM   #4
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Agreed.

I would also recommend leveraging 24v directly as much as you can.

I am running 24v house batteries and, so far, my only loads that require 12v are my Webasto and my smoke/CO detector.

Lights, USB chargers and water pump are all 24v.
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Old 03-26-2019, 09:42 AM   #5
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Thanks,

by tap into what does that mean?
Can i come directly off the battery posts for both and just fuse the +?
I have a 30amp converter, what size wire/fuse should that dictate?

unfortunately it was a little last minute that i decided to go 24v so i had already purchased 12v items.
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Old 03-26-2019, 10:04 AM   #6
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Connect to the battery. Fuse at the battery with a fuse sized to protect the wire.
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Old 03-26-2019, 10:05 AM   #7
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I mounted our 24 to 12 volt converter very close to our webasto. It is dedicated to only the webasto. The webasto is sensitive to voltage drop during the start up phase when the glow plug takes a lot of current.

I would also use a fuse in each separate battery string so that a broken / shorted cell cannot cause an internal dangerous current inside your battery bank.

Our labtops and TV screen ( LCD monitor) are ran of a separate 24 to 19 volt converter that we switch off when not in use as to reduce parasitic losses. All other users run of 24 volt directly... Fridge freezer lights waterpump.

Good luck j
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Old 03-26-2019, 11:34 AM   #8
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Quote:
Originally Posted by joeblack5 View Post
I mounted our 24 to 12 volt converter very close to our webasto. It is dedicated to only the webasto. The webasto is sensitive to voltage drop during the start up phase when the glow plug takes a lot of current.

I would also use a fuse in each separate battery string so that a broken / shorted cell cannot cause an internal dangerous current inside your battery bank.


Good luck j
Good point.

I would recommend not having any parallel battery strings. That eliminates a number of potential issues.

2v,4v and 6v batteries are readily available up to 1000 a/h. Four 400 a/h L-16's turned out to be a good fit for my install. 24v - 400a/h and no parallel strings.
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Old 03-26-2019, 12:04 PM   #9
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Originally Posted by PNW_Steve View Post
I would recommend not having any parallel battery strings. That eliminates a number of potential issues.
j
I understand this, but already have the batteries unfortunately
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Old 03-26-2019, 12:05 PM   #10
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Quote:
Originally Posted by joeblack5 View Post
I would also use a fuse in each separate battery string so that a broken / shorted cell cannot cause an internal dangerous current inside your battery bank.

j
Thanks,
I have not heard of this.
How large of a fuse do I need here, is there a specific connector to use?
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