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How many devices on NMEA2000 network is OK?

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How many devices on NMEA2000 network is OK?

Old 09-06-2014, 07:36 PM
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Default How many devices on NMEA2000 network is OK?

My small network has grown.. To the point where I need to stop using Ts and buy 1 or 2 multi ports.

2 Furuno TZ Touch plotters
1 Airmar GH2183 heading/GPS
2 Lowrance Link 8
Lawrence Yamaha interface cable
1 Lawrence Point 1 GPS

They are all centered around the helm (other than the GPS) but all bought to a long T set up under the helm that is center fed from a fuse block 1ft away. My drops are 6' each to the radios, 3' to the Yamaha and TZ displays.

Is there a point where there are too many devices without multiple power feeds?
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Old 09-06-2014, 08:09 PM
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All the devices you have that have separate power - does not take that much from the NMEA 2000 bus.

So you really only have 2 devices that only feed from the NMEA 2000 bus the Airmar and the Point 1.

And power loss is a function of how many Amp's you transfer / meter(or feet) of cable measured from the power injection point to each endpoint. So since you are "fanning" out from the long T - max cable distance so far is 6'

So you are MORE than safe...

But you only have 7 devices. No need to worry theoretically before you hit 30-50... - or when we get 100 Hz GPS receivers (The faster and more they talk - the more bandwidth they occupy from the N2k Bus)
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Old 09-06-2014, 08:18 PM
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Originally Posted by BadgerS View Post
My small network has grown.. To the point where I need to stop using Ts and buy 1 or 2 multi ports.

2 Furuno TZ Touch plotters
1 Airmar GH2183 heading/GPS
2 Lowrance Link 8
Lawrence Yamaha interface cable
1 Lawrence Point 1 GPS

They are all centered around the helm (other than the GPS) but all bought to a long T set up under the helm that is center fed from a fuse block 1ft away. My drops are 6' each to the radios, 3' to the Yamaha and TZ displays.

Is there a point where there are too many devices without multiple power feeds?
As kaz said, most of those devices are self-powered... no big deal. Read this if you want the technical details:

http://www.maretron.com/products/pdf...on%20Guide.pdf

That's a very small network in the scheme of things.
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Old 09-07-2014, 05:54 AM
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Originally Posted by BadgerS View Post
Is there a point where there are too many devices without multiple power feeds?
Yes. For a simple explanation of network power, see

http://continuouswave.com/whaler/ref.../NMEA2000.html

Read the section under the heading "Network Power"

http://continuouswave.com/whaler/ref...l#networkPower

The available power depends on which network wiring you have used. Typically on small boats the network is wired with NMEA Light cable. This limits the available power to 3-Amperes per network power segment.
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