change charging voltage

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22 Jul 2023 10:57 #887494 by wim2584
change charging voltage was created by wim2584
Hello, 
I have a Kawasaki Z440LTD from 1982, and have it complely rebult/clean/painted, I also added a Gel battery, Know this is the topic.
the "normal "charging  voltage is 14,4-14,6 Volt (optimized for a "wet battery" , but to high for a modern Gel lead battery.

to chage this I have placed a bridge rectifier (for example KBCP2510, 25 A max 1000V, cheap on Aliexpress see attachment), the connect the plus to the minus, and the ac to ac, the you get two diodes in conduction and two revese (see drawing), now the regulator is charging at 14.4-14.6 V, then a lost over the diodes of 0,6 V , so the charge Voltage will be 13,8-14,0.

I have build this in my Kawa, the result is a perfect charging Voltage of 13,9-14,1 V (with light on).

hopefully someone help this.
greets Wim

 

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owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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25 Jul 2023 09:41 #887592 by ckahleer
Replied by ckahleer on topic change charging voltage
The diagram says I do not have permission to access page. 

94 KE100
81 CM200t
82 KZ305
85 VF1100c

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25 Jul 2023 10:11 #887593 by Wookie58
The following user(s) said Thank You: wim2584

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08 Aug 2023 09:42 #888049 by wim2584
Replied by wim2584 on topic change charging voltage
Sorry my mistake, also sorry for late reply, but is was on holiday.
I will this evening try to upload in the correct way

best regrad Wim

owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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08 Aug 2023 11:41 #888056 by wim2584
Replied by wim2584 on topic change charging voltage

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owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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08 Aug 2023 12:03 #888057 by wim2584
Replied by wim2584 on topic change charging voltage
for some reasons   again no picture.., I will try a other way.

for extra Info, when you don't like the 0,6 V  voltage drop,  you can also use schottky diode , then the drop will be 0,3 Volt, a good type to use is 20SQ045-3G (max 45V / 20 A)

owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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08 Aug 2023 12:05 #888058 by wim2584
Replied by wim2584 on topic change charging voltage
schematic

owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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08 Aug 2023 12:06 #888059 by wim2584
Replied by wim2584 on topic change charging voltage
bridge rectifier

owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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08 Aug 2023 12:07 #888060 by wim2584
Replied by wim2584 on topic change charging voltage
schematic

 

owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby

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08 Aug 2023 12:09 #888061 by wim2584
Replied by wim2584 on topic change charging voltage
Now clear how to attach picture:)

the cable I use is the cable form battery/ load, by the start relais, 

owner of a Kawasaki Z440, 1982.
built from two Kawasaki's 1983 gemany, and a 1982 from Netherlands.
elektrical/electronical engineer, with mechanic as hobby
The following user(s) said Thank You: Wookie58

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08 Aug 2023 18:00 #888072 by ckahleer
Replied by ckahleer on topic change charging voltage
This is good info. My Honda Magna runs at 14.8V. While this is great for around town errand running, it's a bit high for long road trips, which I mainly use this bike for. I may try this rectifier bridge, but add a bypass switch so I can switch between 14.2 and 14.8V.

94 KE100
81 CM200t
82 KZ305
85 VF1100c

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