Hi all
Wondering if anyone can help with this. Background:
WAECO charger on my boat approx 10 yrs old blew fuse while charging one night. Tried replacing fuse and it blew right away with no battery attached to charger and seemed to also blow something else internally. Opened it up to see that I have the following damage visible:
1. NTC Thermistor - chunk of it is missing
2. Burned PCB area at the base/pins of 2 x MOSFET
All of this is downstream of a Bridge Rectifier (first one after the 230V transformer) and I have read on some forums that this can often be a culprit (internal short). I am considering to replace all 4 components as they are cheap and its worth a shot instead of the 400-500 dollars for a new unit.
One issue I have is that the NTC thermistor has markings on it that I cannot decipher so I dont know what spec it is. It is stamped with 005 06.
At 16 degrees C I read 7 ohms across the pins, but due to damage I dont think I should rely on that reading.
Any one have any idea what Ohms and Amps spec I should have on this Thermistor? For info its green in colour and looks like ceramic insulated approx 10 mm in diameter (disc shaped with two prongs).
The charger spec is as follows:
230V in for 12V system in boat
Max charge current 25A
Max battery capacity 300ah
Fuse for supply power 4A
Thanks in advance for any help
Oliver
Wondering if anyone can help with this. Background:
WAECO charger on my boat approx 10 yrs old blew fuse while charging one night. Tried replacing fuse and it blew right away with no battery attached to charger and seemed to also blow something else internally. Opened it up to see that I have the following damage visible:
1. NTC Thermistor - chunk of it is missing
2. Burned PCB area at the base/pins of 2 x MOSFET
All of this is downstream of a Bridge Rectifier (first one after the 230V transformer) and I have read on some forums that this can often be a culprit (internal short). I am considering to replace all 4 components as they are cheap and its worth a shot instead of the 400-500 dollars for a new unit.
One issue I have is that the NTC thermistor has markings on it that I cannot decipher so I dont know what spec it is. It is stamped with 005 06.
At 16 degrees C I read 7 ohms across the pins, but due to damage I dont think I should rely on that reading.
Any one have any idea what Ohms and Amps spec I should have on this Thermistor? For info its green in colour and looks like ceramic insulated approx 10 mm in diameter (disc shaped with two prongs).
The charger spec is as follows:
230V in for 12V system in boat
Max charge current 25A
Max battery capacity 300ah
Fuse for supply power 4A
Thanks in advance for any help
Oliver