โMay-04-2021 05:42 PM
โMay-05-2021 12:44 PM
One article (which LFP folks here liked or hated depending on their moods of the day) said if you charge at less than 14.6 that was ok; it just meant you got a longer Absorption Stage.
โMay-05-2021 12:13 PM
โMay-05-2021 11:16 AM
โMay-05-2021 09:14 AM
โMay-05-2021 09:04 AM
โMay-05-2021 08:28 AM
โMay-05-2021 03:08 AM
Almot wrote:There is current flowing through your cables between the power supply and the battery creating a 0.05V drop across the cables. The higher the current the higher this voltage across the cables will be. This is known as IR. Your Meanwell doesn't have sense lines so you will have to accept this.
Set Meanwell to 14.2V, connected LFP. Voltage went up quickly to 14.1, then slowly climbed to 14.15 and refused to go any higher for a couple of hours.
Meanie got hot, I stopped the charging, disconnected LFP, set Meanie to 14.23, connected LFP. In a couple of hours voltage went up to 14.19 and didn't go any higher. Disconnected again.You need to put a fan on it.
My guess is it's going into thermal protection. It overheated, turned the output off, battery voltage dropped to 13.8V, it cooled down, turned output back on and battery voltage climbed back to 14.05V. If you were measuring the current you would have seen it go to 0A then back to 14+A with the voltage changes.You really need to put a fan on the power supply.
Set Meanie to 14.22, connected LFP.
Voltage immediately jumped to 13.8 and was going 13.8-14.05 for half an hour (this up and down didn't look normal to me),then settled at 13.95. Meanie got really, really hot, was giving off a smell and making a quiet high-pitched buzz - not an alarm buzzer, but I got the message and disconnected it.
This is limiting the power supply current output, creating a very slow charge profile. Your power supply is happy with this, but is your battery?
Connected Meanie to solar controller input and LFP to controller output. Voltage under charging 13.1, controller output 11A. After a few hours voltage climbed to 13.4, current dropped to 10A. Now everything goes as it should.
โMay-05-2021 12:10 AM
โMay-04-2021 11:46 PM
โMay-04-2021 08:29 PM