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#11 Cpt Davenport

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Posted 23 May 2022 - 10:00 PM

So would this sequence be ok for the charge controller?

 

Solar panels

275w total--->20amp fuse--->Victron 100/20 controller--->30amp fuse--->positive on 100AH battery---->50amp fuse---->BlueSea box  


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#12 ckent323

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Posted 24 May 2022 - 12:57 AM

Between your solar panel(s) and the Victron Solar Controller, determine the short circuit current for your solar panel(s).  

 

The Solar Controller can handle the current from the panels (unless an undersize controller was selected).  Make sure the peak current from the panels does not exceed the input current of the Solar Charge Controller (at least not by very much).  The fuse consideration is mainly to protect the wire.

 

Solar wiring is often 10 gauge.  10 Gauge wire will carry 30 A safely, so if the panel(s) short circuit current is less than 30A you don't need a fuse. 

If the short circuit current is greater that, then use a 20 A or 30 A fuse.   

However, as others have said, even if you don't need a fuse, it may make sense to put a breaker switch inline between the panel(s) and the Solar controller so you can disconnect the panels if necessary.

You do need a fuse between the Solar Charge Controller and the battery to protect the Solar Controller against reverse polarity which will damage it.  The fuse should be a size that matches the Solar Controller output current (or perhaps slightly larger).  My guess is that 30 A is probably OK.

You do need a fuse between the battery and the house loads.  Depends on wire size but I will assume 10 ga house wiring so a 30 A fuse should be OK.

 

You may want to consider putting a fuse on the house battery side of the BlueSea ML ACR in the truck and another at the house battery in the camper.  That protects the wires from a short on either side.  These fuses again depend on wire size.  You are trying to protect the wire so size the fuse at the current carrying capacity of the wire.
 

if 8 ga 55 A
if 6 ga 75 A
if 4 ga 95 A

if 2 ga 130 A

https://www.altestor...olt-dc-systems/

 

 

I hope this is helpful.

 

Regards,

Craig


Edited by ckent323, 24 May 2022 - 02:39 AM.

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1993 Dodge Cummins W-250 Club Cab long bed, 2007 FWC Keystone


#13 Cpt Davenport

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Posted 24 May 2022 - 01:56 AM

Super helpful guys! It is all slowly making sense. It is hard not having the camper here so I can visualize the system and locations of everything. I take delivery on July 20. Just trying to get most of my goodies ahead of time because when I hand over that cashiers check for the full amount, I'm gonna be busted.


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