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| Bench PSU 30V/10A as a car battery charger |
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| radiolistener:
--- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---When I connected the battery, the output current adjusted automatically to ~5A and dropped the voltage about ~13V. --- End quote --- that is correct behavior for accumulator charge, if your accumulator is 50 A/h. --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---I then regulated the output current about ~9A and voltage raised about ~13.5V. --- End quote --- that's is your mistake, you can damage your accumulator in such way. --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---I am thinking that ~9A is too much for charging --- End quote --- and you're right. At first step you're start to charge accumulator in the correct way (by limiting current and voltage). But when you decided to increase volatage and current limit, you're go to the wrong way. |
| sdancer75:
--- Quote from: T3sl4co1l on June 12, 2019, 02:07:18 pm ---Yes; leave it for a few hours, and when you come back it should be around 14.something volts. Some hours more, and you should see it at the same voltage as the setting, and current dropping quite low. :-+ Tim --- End quote --- Thank you Tim ! |
| sdancer75:
--- Quote from: radiolistener on June 12, 2019, 05:46:35 pm --- --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---When I connected the battery, the output current adjusted automatically to ~5A and dropped the voltage about ~13V. --- End quote --- that is correct behavior for accumulator charge, if your accumulator is 50 A/h. --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---I then regulated the output current about ~9A and voltage raised about ~13.5V. --- End quote --- that's is your mistake, you can damage your accumulator in such way. --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---I am thinking that ~9A is too much for charging --- End quote --- and you're right. At first step you're start to charge accumulator in the correct way (by limiting current and voltage). But when you decided to increase volatage and current limit, you're go to the wrong way. --- End quote --- Thank you for pointing me about my mistakes. Best Regards, |
| sdancer75:
Excellent! Thanks. |
| mzzj:
--- Quote from: radiolistener on June 12, 2019, 05:46:35 pm --- --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---When I connected the battery, the output current adjusted automatically to ~5A and dropped the voltage about ~13V. --- End quote --- that is correct behavior for accumulator charge, if your accumulator is 50 A/h. --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---I then regulated the output current about ~9A and voltage raised about ~13.5V. --- End quote --- that's is your mistake, you can damage your accumulator in such way. --- Quote from: sdancer75 on June 12, 2019, 12:20:29 pm ---I am thinking that ~9A is too much for charging --- End quote --- and you're right. At first step you're start to charge accumulator in the correct way (by limiting current and voltage). But when you decided to increase volatage and current limit, you're go to the wrong way. --- End quote --- No big deal even if you charge the car battery at 9 amps. After all they are charged with up to 120 amp(or even more) alternator with 13.8 to nearly 16 volts depending on temperature. |
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