I have 2 IP22 chargers in my boat and 2 IP65 chargers maintaining my motorcycle batteries in the garage. They all appear to do this current oscillating thing. I did send a video of this phenomena on my IP22 units and the accompanying noise to the place I purchased them from but they appeared to be clueless. No manufacturer recall apparently.The units appear to maintain the batteries and provide sufficiently smooth power on the boat for the lights and TV. I simply assumed that’s just how they work. The most recent IP65 is only 2 months old. Surely they can’t still be shipping faulty units?
You have a newest firmware posted above by Victron Community Manager. Please try and let us know if that help at all 
TY
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Thank You, somehow i didn’t notice the attachment.
So i have just installed the newest beta and did some tests.
Looks way better now, but still not as it should in my opinion - especially the float phase.
Here is the absorption phase: https://youtube.com/shorts/Qx7oY33swG4?si=FUQxQaVj1i5wnIPI
And float: https://youtube.com/shorts/YY19msIfPTI?si=g-bFA5BcRJHT2nB7
I’ve sent my device HQ2522 to Seller and got back the HQ2531… connected it to sort of discharged battery (12.2V) and it pulled steady 15A at the beginning. Looks correct. Then connected it to the other batt (it was charger few days ago and in storage) and using this second batt showed fluctuation immediately. It strongly looks like ip22 cannot handle low current situation. I might try soon the 2nd beta software.
Recently purchased Blue Smart IP22 12v 15A serial HQ2531337XY. Seems fine in bulk mode but when it gets to absorption, the current pulses with a few seconds at 15A, drops to zero for a few seconds. Thr cycle then repeats. Absorption voltage is 14.2 and time is set to 30 minutes for the Fogstar Drift 105ah lithium battery. Voltage increases during 15A current pulse.
My serial number falls within the affected batch numbers so are the above symptoms indicating it is faulty? Firmware was updated to 3.65 when first powered on.
The replacement was still in the range of affected products
This is now a long thread and I’m seeing new comments that haven’t read my previous posts, so I have for now just accepted the main reply as answered so they appear at the top.
I don’t consider this issue resolved yet.
Hi,
We have another update that further smoothens the behaviour at low-current-output on the IP22 chargers.
Please test it over the weekend and let us know the results, or more importantly any issues.
As this now is such a big improvement from the current firmware version we will be looking to a normal public release very soon.
Have loaded the new version is it’s much more stable now, will monitor it over the coming days and see how it goes.
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Happy to hear it!
Could you please report back after testing at lower currents as well?
As current reduces the instability increases again nowhere near as bad , but not what is expected.
Would have thought the voltage would stay fixed and current reduces slowly, it’s like the loop see’s a change in one and changes the other to compensate.
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I’ve installed latest beta Blue Smart IP22 Charger - v3.67-beta-02.zip in HQ2531 - which Seller send be back, unfortunately is still in the range, however I’ve been playing with this firmware update and I can see major improvement. Once the current drops to around 2A the deviation is max 0.5A and steadily, and as per current drops more to around 1A the deviation is kept at maybe 0.3A. I also cannot see amperage peaks (comparing to original firmware), and also voltage seems steady now at 14.5V. For me second beta has a potential to be release candidate.
Conducted my experiments using same battery which is 45Ah,360CCA normal flooded and victron setting was all default on ‘normal’
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Dla porównania macie tutaj jak powinno to działać (wczoraj zakupiony victron 12V/20A hq2434)
Zero jakiegokolwiek falowania. Wcześniejsze 2 sztuki hq2525 oddane do sklepu.
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Thanks for testing @gregoryo
We agree, and unless there is some unforeseen reason, It is likely that this 3.67 beta 2 firmware update will be released as a general release in the very near future.
From the results I have seen now it is a significant improvement over the original firmware for the hardware in the HQ2511 → HQ2551 range.
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I did one test on the latest beta release and it looks bit better than previous one.
The current still jumps a bit, but looks like its smoother than before.
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I tested beta-02. Unfortunately I still see those voltage/current peaks.
I also do not understand why there is such a big difference between voltage at the output of my BSC and the battery voltage reported by the smart shunt via smart network. This difference jumps and happens at low load, so it cannot be voltage drop trough the cabling. At higher load everything works stable.
Are you able to measure with an external tool such as a multimeter at the points at the BSC and the smart shunt to see if the voltage is actually changing on the circuit or just in VictronConnect?
I cannot do any more tests within the next few days because I am currently away from my system. But I did those measurements in the past even with different BSCs.
The result is always the same: Victron Connect sometimes (under low load) shows higher voltage than I measure with other tools. I even returned one BSC because I thought it was faulty. But the next one showed the same behaviour.
Test 1 (Multimeter is connected to the battery for the photo, but the reading is the same at the pins of the BSC):
Test 2 (photo and screenshots are taken at the same time):
Absorption was set to 14.1V at test #1 and 14.0V at test #2.
Ok. The measurements are inconsistent because he uses a different charger (the HQ2448 series, which are free of defects). In the first post, he has an HQ2534 charger…
How does one go about updating the firmware on the IP22.