School me on fuses

[offthemap]

Alright I have the cart listed in my signature below and at this point I am nearly completely finished updating everything and converting to 42v.

I have a couple questions about the inline fuses for my charging circuit and my "high loop" and my searches brought up conflicting info / pics.

I don't really need to know the specific differences between in an ANL, ANN and CNN inline fuse, but which one do I need to use in my golf cart, for both circuits?


I have a 10 pack of 250a ANL fuses and I had intended to connect one directly to the B- on my controller (top right of controller). Is this the preferred size, location and type of fuse for the high current circuit?

What size fuse should I include in the charging circuit? 40, 50, 60a? I have a Delta-Q Quiq charger 913-4810-E3B set up to charge my 42v pack thru the Delta 3-pin charger cord and 3-pin charger receptacle.

[scottyb]

Alltrax is using ANN fuses.
ANN fuses are fast acting and ANL are slow acting fuses.
Ezgo uses a 50a AMG type fuse on the charger.

[offthemap]

Originally Posted by scottyb

Alltrax is using ANN fuses.
ANN fuses are fast acting and ANL are slow acting fuses.
Ezgo uses a 50a AMG type fuse on the charger.

Thank you Scottyb once again!

For your personal cart, don't you have the fuse for your high current loop connected to the B- terminal on your controller? I feel like I saw a picture you've posted of your cart like this.


The 250a fuse is the right fit for my application with the 400a controller, correct? Again, I think I saw either you of Johnny recommend that size in another post somewhere.

[Volt_Ampere]

Even fast acting fuses are not that good at protecting Mosfets.

[JohnnieB]

That may have been my DCX400 installation, but that was a blown motor and two controllers ago.

The fuse in the high current loop is an ANN250 (400A controller) and can be installed on either end of the B- cable. It also can be installed on either end of the B+ cable to the solenoid or on either end of any of the cables connecting the batteries in series.

On the controller side of the solenoid, the B+ cable splits and goes in two directions, so you have to be careful where you install the fuse to have all the branches fused.

The AMG50 (or AMG60) fuse in the charge loop is typically connected to the main positive terminal and the positive (white) wire from the charge receptacle connects to the fuse.