Help balancing

[mystic pizza]

Hmmm .... mine unscrew. You would probably get some gain just by replacing the alligator clips.

OK. I made up some better leads, see what that does

 

[mystic pizza]

Any chance to post a picture of the charging setup, connections, and voltage display?

 

[mystic pizza]

I suspect the Psu may be knackered. It was putting in 10A earlier. Now nothing I think.

 

[mystic pizza]

Looks like below 4V it has no output current.

New power supply in order unless anyone has a solution. It was happy to put 10A out at over 14V

 

[mystic pizza]

OK. New power supply installed. This one will not input anything below 3.6V, but OK at 3. 65V

Does that sound correct?

 

[mystic pizza]

To put it another way. What current should I expect at 3.57 volts. 1/2A seems low to me. Are my cells knackered?

 

[mystic pizza]

Anyone?

3.57V pushing very few amps

 

[time2roll]

To put it another way. What current should I expect at 3.57 volts. 1/2A seems low to me. Are my cells knackered?

Current will depend on the quality of circuit regulation. I think we would expect that if voltage is sagging as shown, the amps should be close to full rating. However that does not always happen and may take more than 0.100 droop to trigger full current.

Do verify the amps control knob is adjusted to provide full rating. At the same time don't override the cap on voltage.

Also check the connection to the batteries. Most included leads are a bit undersized and use alligator clips. Best to make leads with #10 wire and ring terminals. The voltage drop can be checked with your multimeter on the battery terminal and compare to the power supply output terminals.

 

[mystic pizza]

3.569 on psu

Current will depend on the quality of circuit regulation. I think we would expect that if voltage is sagging as shown, the amps should be close to full rating. However that does not always happen and may take more than 0.100 droop to trigger full current.

Do verify the amps control knob is adjusted to provide full rating. At the same time don't override the cap on voltage.

Also check the connection to the batteries. Most included leads are a bit undersized and use alligator clips. Best to make leads with #10 wire and ring terminals. The voltage drop can be checked with your multimeter on the battery terminal and compare to the power supply output terminals.

3.568 on battery 3.469 on psu. Current set to 9A.


3.57V @ fluctuating current between 0.1 and 0.4 on psu

 

[mystic pizza]

Current will depend on the quality of circuit regulation. I think we would expect that if voltage is sagging as shown, the amps should be close to full rating. However that does not always happen and may take more than 0.100 droop to trigger full current.

Do verify the amps control knob is adjusted to provide full rating. At the same time don't override the cap on voltage.

Also check the connection to the batteries. Most included leads are a bit undersized and use alligator clips. Best to make leads with #10 wire and ring terminals. The voltage drop can be checked with your multimeter on the battery terminal and compare to the power supply output terminals.

Adjusting the psu to
3. 8V gives me full current, but obviously, I don't want to damage the cells.

 

[mystic pizza]

I have 7 parrallel cells if that makes any difference..

The second set are taking 2.5A at 3.57 V (3.65 on PSU)

 

[houseofancients]

I have 7 parrallel cells if that makes any difference..

The second set are taking 2.5A at 3.57 V (3.65 on PSU)

just set to 3.65 and be patient untill current drops to 0.5 a

 

[mystic pizza]

just set to 3.65 and be patient untill current drops to 0.5 a

See post above