Hello. I am using the auto start (generator) function in the Cerbo to remote start my IP43 charger (relay cerbo and IP43). I have rules for low voltage (ie 23,5V) and low SOC (<80%) witch will start the IP43 to charge the batteries. However sometimes the charger will start and goes into BULK. So far…

Hello Paul, Yes, that is dissapointing. I notice you set the SOC for charging is 80%. Could it be the SOC has not gone below 80% when you request charging? I known that doesn’t match the voltage level but maybe the SOC is not tracking correctly?

Hi Trevor As the auto start conditions are not AND type but OR this should not be the case. The charger switched on due to low voltage and should therefore start charging accordingly. I have now set the charger manually on so it force float most of the time. I will do another test but as far as I c…

@Paul The rebulk off set is the issue. (And possibly temperature conpensation is complicating it) It has to drop 2.4v under float. Looking at the screen shot of your settings. 23.87v is slightly above 26v minus 2.4v… just saying alter that one to trigger it on demand. This is stated in the manu…

I will try lowering the rebulk setting. However why does the charger not go to the bulk setting of 27,5V as is the requested voltage? The charger goes on and does go in bulk mode. So why does the charger in this state look at the rebulk offset?

It wait until the battery dips below the rebulk offset before strating a charge cycle. Maybe with the other charge sources and the no amp draw, the charger is not charging up all the way. Since are starting and stopping using the GX just set it correctly with the same settings as the other charger…

I thought when the charger was remote off and then restarted it would go directly into bulk mode (as also can be seen in screenshot). I would expect rebulk settings when it was already on in float and then dropped below rebulk voltage. So this looks like a flaw because when it’s remote off then it i…

It is doing what you are telling it to do. The settings are telling it to rebulk at 23.6v. The storage being the same setting as float are messing with it as well See storage point 5 here. Usually it is slightly lower than float. Storage ▶ Summary Set it correctly. If it does not behave after tha…

Thanks Alexandra I will keep it monitored. I have set float absorption and Rebulk settings to values as advised. Will keep you informed. This will take a time because it has happened only a few times. Most likely as you stated due to conditions where the charge algoritme is confused with the settin…

We are all keen to hear feedback as well. :slightly_smiling_face:

Today again same issue. Ip43 switches on and goes in bulk. No amps delivered to system only 0,2 amps. Rebulk settings all ok. Inverter switches off because of low voltage. What is wrong with this charger? To me it lookes like the charger is just freezing up at 23,6 Volts and just stops. [IMG_6762…

IP43 charger not delivering amps (remote on) freeze on charge

DIY

From_Waste_To_Wind December 21, 2025, 12:38pm 18

Did this get solved with RMA? I seem to have a similar problem: Phoenix IP43 Smart Charger 120-230V reports totally wrong DC current, and other.. bugs?! - #5 by From_Waste_To_Wind

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IP43 charger not delivering amps (remote on) freeze on charge

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