Hi,

Two days ago my 45Amp battery charger (Waeco PerfectCharge IU4512) died while charging an empty AGM DeepCycle battery rated at 260Ah. I have recently bought two such batteries and using my DC electronic load I discharged each to find out the true capacity (100% until 10.8V).

While the charger was able to fully recharge the first battery, 10 minutes after hooking it up to the second one, it blew the fuse (6.3A @ 250V) and also tripped the main breaker for that rail. I replaced the internal fuse and it blew it again.

Long story short, I started this repair and found out the bridge rectifier (KBPC2508) was shorted (neg. to AC diode). Replaced the bridge with a new one and higher ratings (25A @ 800V vs 50A @ 1000V) and I was good to go. The unit works but each time I start it, the NTC sparks a little. The ceramic surrounding has a tiny crack, about 5mm long, so I put a shrinking tube over to avoid other strange things like arcing with other components nearby.

I have no service manual and on the NTC component there are no writings, other than "NTC" marked on the board.

How would I find the correct value for it? It measures 9,4Ohm @ 19C but I have no idea about the AMP rating. Picture attached below.

BTW, the capacitors are 2 x 1000uF / 200V / 85C

Any suggestion appreciated!

Thanks,

Raz