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05-03-2017, 11:13 AM | #1 (permalink) |
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Join Date: Mar 2011
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Dps-600pb power supply problem
Hello guys, recenlty I am experiencing some trouble with those chargers. I have a twin PSUs for a 24v 1150 watt instalation and I am using the Powerlab 8 V2 charger. I followed all the rules to make them work properly, pins 4-6-10 grounded to pin 8 so the PSUs are on and fan speed is low, DC is floated on the second unit and they are linked in series with 10AWG wire.
I have always had instability during charging in the range of 15A to 35A with surges going up and down maybe even 5amps and the charger not holding the targeted amperage. In other cases the charge was stable and at full throttle the charge was stable too I guess because the PSU were outputing their max voltage. Anyway the first PSU gave a loud bang a month ago so I was left with the DC floated unit and charging at 12v. Yesterday I received another unit from ebay and connected them as before to make a 24v PSU. Here comes the problem, The charger cuts in less than a minute because of "undercurrent" fluctuating between 1.5 and 8A like crazy. Eventually the error stops the charge. After a close inspection the "new" PSU starts at 12.5v but when the charger releases the current the voltage of that particular PSU drops to 11v, thats even at 1A. I know there are pins to control the voltage output but the old PSU never falls under 12.5v, moreover it increases with the consumption to 13.x volts. My question is, is the new Dps-600pb a faulty unit? Or am I doing something wrong Thanks and sorry for the long post. Last edited by Mateyhv; 05-03-2017 at 05:32 PM.. |
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06-06-2017, 10:28 AM | #2 (permalink) |
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Thread Starter
Join Date: Mar 2011
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Well, guess there is no one using this supply. I already know the one I received was defective. Now I am using one Dps-600pb for charging at 12v and usign a couple of Dps-1200 for 24volts and almost.... 100Amps, what a beast
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06-06-2017, 10:40 AM | #3 (permalink) |
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Join Date: Nov 2012
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Regarding the surging of amps, I had the same thing happening with a PL6. All it is is the buck/boost transition when the pack voltage is the same as your power supply voltage (right around 25v for 2x dps 600pb with no voltage adjustment). So it only happens on 6s packs.
Solution is to turn up voltage higher than 26.5v. Currently using 2x dps 600pb in series at 26.8v (400ohm resistor on voltage adjust pins) and they are stable, no more surging. Or you can go lower than 24v but I've never tried it with these power supplies. Anyway good thing you got it sorted. If it is not happening with your new power supplies they must output lower or higher than 12.5v.
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06-06-2017, 05:15 PM | #4 (permalink) |
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Thread Starter
Join Date: Mar 2011
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Wow, thank you flint. I have had this problem for years and never knew what was going on. You are right I used 6s batteries and as the voltage rised from 12.5 to 13v per PSU depending on power output, it makes sense that at middle throttle the PSU voltage matched the charging voltage.
Unfortunately I got a bad dps600 in ebay so was left with a single PSU, ok for charging several 6s at 20A at full throttle. I set the dps1200 voltage to the max thirteen point something from the beginning so had zero problems there. You can go even higher changing the variable resistor in those PSUs but I had no benefit doing this. Thanks |
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