Panel-to-Charge Controller Fuses

[nhardin24]

Going to attach 4 in-line fuses to my branch connectors. Should I attach the 10, 15, 20, or 30 fuse amp size for my 400W system being wired in parallel? There will be a total of 22.48 combined amps. Is there any harm in getting the highest rated fuse? They are all the same price: https://www.renogy.com/solar-connector-waterproof-in-line-fuse-holder-w-fuse/

Thanks all!

 

[12VoltInstalls]

What is the panel fuse rating ?

 

[nhardin24]

What is the panel fuse rating ?

Max Series Fuse Size Rating: 15A for each panel

 

[12VoltInstalls]

So two 200W panels in your system?
Two panels either in series or parallel do not require fuses as they are 11.24A which is below the 15A fuse rating.
Four 100W panels in parallel I would want 8A or 10A fuses.

Fuses aren’t bad. I think I have 8A MC4 fuse holders but they might be 10A.

 

[nhardin24]

So two 200W panels in your system?
Two panels either in series or parallel do not require fuses as they are 11.24A which is below the 15A fuse rating.
Four 100W panels in parallel I would want 8A or 10A fuses.

Fuses aren’t bad. I think I have 8A MC4 fuse holders but they might be 10A.

Thanks for the info! Unfortunately the lowest fuse size that Renogy sells is 15A. I have (4) 100W panels each with a "max series fuse rating" of 15A

 

[12VoltInstalls]

the lowest fuse size that Renogy sells is 15A.

Forget renogeey
Any 20A rated MC4 fuse holder and a pkg of 8A fuses will work. I don’t know if it were for my system or another but I’m fairly certain I bought windyNation MC4 fuse holders with 8A fuse and a spare, but I may have simply bought 8A fuses. I do have a recollection of WindyNation MC4 fuse holders with 10A being bought at some point but a had a cardboard box liberated from my jeep with like $1200 in it that included MC4 spare stuff so I might have just used whatever I had loose.

The point is the fuse ratings are not dependent on the holders other than some are 20A rated and others 30A.