Fusing for 48V Orion DC-DC Converter

DIY
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1

I am doing a fairly complicated electrical upgrade to our RV, removing the 12V AGM battery, inverter, and air conditioner, to install the Lithionics 51V modules, a 48V inverter, and a 48V air conditioner. To do this, I am putting in an Orion 48/12-30 DC-DC converter to power the existing 12V circuits.

My issue is that I am struggling to find a 15A fuse (or even 25A for the AC) rated to operate on voltages upwards of 60V from the battery bank. Most fuses in this size range are rated for 32V max, so how are folks fusing their 48V Orion converters? It doesn’t seem right to just fuse the down-stream side of the circuit, since there really should be a fuse for the feed to the Orion.

2

Given the fuse is only in place to protect the cable between the battery and Orion, and the Orion can accept 16mm cable, a 30a fuse would seem acceptable.

Victron has a 30a 58v midi fuse available.

3

I like MRBF fuses. They are good for 58V. They go down to around 10-30A.

1 Like
6

I have been coming to the same conclusion. Thanks!

7

You have found MRBF fuses less than 30A?

8

Looks like bussmann make them, 10A 25A and 30A,

9

Interesting… Available in Australia, but not in the US. I checked Bussman (Eaton) and nothing under 30A in the US.

10

The midi and mega fuses are a good option just a few more fittings and bulky holder. I dont know if the inline MC4 fuses will be any good they go up to 1000V. I like the MRBF they are so compact. I have a buss in my boat with 4 mrbf fuses and its the size of 1 mega or anl fuse holder. A midi is good about 50A till they start get to get hot the mega does not heat up much at all will go 200A no problem.

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