fuse going to pack from charger

[deerhunter88]

Where can i find the fuse that connects from the charger recepticle to the battery pack? Mine has some corrosion and just looks old. Everything else is new so i might as well change it. Its a 48v txt series with a DPI charger. What size fuse is needed?

[JohnnieB]

Originally Posted by deerhunter88

Where can i find the fuse that connects from the charger recepticle to the battery pack? Mine has some corrosion and just looks old. Everything else is new so i might as well change it. Its a 48v txt series with a DPI charger. What size fuse is needed?

It's about 50 or 60 amps, however the rectifier diodes (or SCRs as used in the DPI and similar designs) have a lower ampacity, so they are effectively protecting the fuse from an over-current condition. Just another example of lawyers and accountants riding herd on the engineering department.

FWIW: A fuse has to have resistance to function and any resistance in the charge current path after the battery voltage is sensed by the charger, lowers the voltage the battery is actually charge to and while I neither recommend nor endorse eliminating it, I believe I forgot to install it the last time I cleaned my battery cables.

[camaroluvz28]

I too have mistakenly forgot to put these back on once or twice...

[deerhunter88]

Anybody seen where i put mine???? Guess not.
Must have lost it!!!!

[yurtle]

Originally Posted by JohnnieB

FWIW: A fuse has to have resistance to function and any resistance in the charge current path after the battery voltage is sensed by the charger, lowers the voltage the battery is actually charge to and while I neither recommend nor endorse eliminating it, I believe I forgot to install it the last time I cleaned my battery cables.

I never even considered that until you mentioned a while back so I accidentally removed mine.

[JohnnieB]

Originally Posted by yurtle

I never even considered that until you mentioned a while back............

I only reiterated what Gustav Kirchhoff figured out in 1845.

Kirchhoff's second law (The algebraic sum of the products of the resistances of the conductors and the currents in them in a closed loop is equal to the total emf available in that loop.) applies to the cables, connections and components in the motor drive circuit as well.

[yurtle]

I understood current is the same throughout the loop, I just never considered the fact that a fuse imposes resistance.