Hi, I have in one of my setups
Smart charger MPPT 150/85 and 250/100 sync via smart VE Network, A bank of AGM, a basic 3kW inverter and over 3.5 kW of solar panel split as require across the 2 chargers and working well except abs.
It hits the absorption voltage required the goes straight to float mode even thought there plenty of Solar capacity, I tried setting it into manual mode and set Absorption duration to “fixed” and set it for fixed time of 30 mins and up to an hour and disable Tail current to make sure that it does not effect Adsorption mode from running, still does not kick in.
I have tried doing more simple setup and it did not work either of some batteries and one smart charger???
Hi I have some extra info for the first time entered into Absorption mode for 1 min not where I thought would do it. It looks like I add voltage spike @1522 on the one charger and enter into the absorption mode for 1 minute. Not sure why ?
I’m having the same issue ,sometimes they skip absorption or go to a shorter or longer time ,when I set mine to fixed and 1hr and disable tail current , I’ve tried a few things like powering down both charge controllers , I have latest software, moved my rj 45 communications cables away from other wires , today I disconnected the rj 45 cables from both charge controllers and disabled Bluetooth ve communication ,so there in stand alone with identical charge settings ,I have no comunication to my lithium phosphate batteries , they both went into absorb for 1hr and 13 minutes ( my settings were for 1hr fixed ) I did notice the voltage dropped to just under my absorb settings due to inverter loads , then they both went to float , awhile later 1.5hrs ,clouds came and lowered battery voltage and charge controllers went to bulk , then a short time aprox 10 minutes one charge controller went directly to float while the other continued in bulk for 35 minutes or so then second charge controller went directly into float . Not sure what’s going on , weird
Hi, it is 2520 Ah battery setup 18 x 140Ah
The battery are 140Ah and the max charge current per battery is no more than 10-12A ( If I understand what you mean by 0.1c terminology get me with it all still)
using 32mm2 cable from the chargers to Lynx shunt and using Cerbo GX and using a Smart Battery sensor all on a VE.Smart Network to interlink it all.
I had similar setup of 24 batteries, 110Ah AGM which lasted about 10 years with mix brand set of chargers and a lot worse wiring setup …
I hope extra info helps.
Hi, I am starting to think the same that the monitoring voltage is lower to due the load, just it never goes into the absorption mode except that one spike. As thought have the Smart battery Monitor setup on the batteries would fix that and report directly to the chargers so they can make sure base on setting would work. ( I could have this all wrong)
I don’t believe where your comm’s cables are would be effect by any RFI. If I got this right it may go longer because of the fluctuations of the voltage due to the load as it is making sure that the batteries got a full hour where in that time for 13mins of that was below the absorption voltage but not low enough to enter bulk charging and just stayed in absoption mode.
For the second part I found that happen because I did not have the comm’s setup correctly between the 2 chargers and they were just doing their thing as one was just bias enough to take the lead and the other one was think it did not have to do any thing.
I have heard if you get excessive ripple this could cause a problem ,I did a ripple test using a fluke88 multimeter and I’m within specs I’ve seen in Victron wiring info ,also did a voltage drop test and it was also within specs , the positive lead with a breaker in it had the most voltage drop ,but still acceptable,virtually no voltage drop on negative wire , well I decided to up the wire size and give that a try ,as ripple is usually caused by voltage drop , as amps climb ,
Well I will see in the next few days ,unfortunately today is a big snow day .
Just the Chargers can not take any size bigger than that into their terminals and runs are about 1.5 meters at most.
And just not sure what you mean by they just be in a useful range and how that effects it going into Absorption mode?
I tested ,ripple and voltage drop at 60-70 amps flowing , all was good , length of wire is about 5 feet , I will see in the next few days with the larger stranded (620) 2 gauge wire . As today was terrible for solar ,tons of snow 42 cm .
If you have ( from what I heard ) excessive ripple or excessive voltage drop this can affect the charge controllers , ( they are a mini computer ) so the first thing is to make sure all wiring is adequately sized and set up like Victron designed it )I come from automotive background and if you don’t have things set up like when the car was new ,example valves out of adjustment , you can chase for hours and install parts that weren’t really needed to find the problem , so I always make sure adjustments and tune up stuff are right before going nuts trying to find a problem , this is the same for electrical ,( if you don’t have wiring etc set up the way charge controllers were designed from manufacturer you might be chasing for hours and wasting money . This is the way I’ve being diagnosing electrical and automotive for 34 years , and it seemed to work for me .UPDATE FEB 14 AFTER all my wires to charge controllers have been upsized to awg2 (35) today full sun and battery soc 59 % and system with moderate load 3000watts for several hours with high power coming from panels 8000-10200watts charge controllers went to absorb for exactly 1hour as setup in setting previously then to float . Perfect ! let’s see if this happens for the next few days .
How does this answer why my system does not enter in absorption mode. As have plenty of solar capacity, system seems to be setup correctly to some what, looking to understand what I have not done or if there is real problem with Victron equipment?.
Thanks
I’m hearing some people have disconnected there charge controllers from Bluetooth ve can and have just hardwired rj45 cables going to cerbo gx , and that fixed there problem and charge controllers go to absorb . Give it a try ! Let us know if that worked.
Ok, I have smart battery monitoring on Bluetooth and can not be hard wired might have to disable it temporary and I could see I can voltage sense from the shunt to monitor battery volts, as I have rest hardwired.
Mine are working great 3 days in a row since I changed wires from awg 4 ,18 strand to awg2 620 strand , I still have rj45 hard wired to cerbogx and Bluetooth enabled ve can
let’s see if this happens for the next few days .