At the end of the absorption time the batteries are not full yet so I was looking for a way to increase the absorption time.
The algorithm is set to user and the max absorptiontime is set to highest (24h, just to try to increase)
Still I only get about max 2h absorption time.
According to the manual the MPPT device checks the voltage just before charging so this morning the voltage was 24.4 volts and I only got 1h of absorption in stead of 2/3 of 24h is 16h
Am I missing something and what can I do?
Thanks
Dirk
VenusGX
BMV 702
BlueSolar MPPT 150/85 (VE.Can) 2x
MultiPlus 24/5000/100/120 2x (second to be connected any time now…)
Phoenix 24/3000
Panels 10kW (on 2 solar trackers)
Battery OPzS 54kWh
Orion 24/12/70
Have you changed it to fixed absorption time because this then uses the input value. Also consider using fixed absorption with tail current to end absorption earlier. However, if you do go to fixed you must reduce it back down from the 24 hours you have input.
I have this one, I always thought the difference with these and the square ones were that these are called VE-CAN but now I see the square ones have also written VE-Can on them, confusing… Anyway, I don’t think I can connect these with the Victron Connect app and I don’t see a way to manualy change it to fixed absorption.
Am I right to believe these devices charge on there own settings or do the gx or bmv interfere?
Oh, you have the older BlueSolar version, not the SmartSolar version. I now realise I missed that in your equipment listing in your first post. You are correct, increasing absorption time does not necessarily give more absorption if the algorithm decides to stop earlier.
Put the float voltage the same as the absorption voltage in the mppt.
Have an arduino switching the mppts on and off.
Arduino is controlled by mesuring Amps loading in batteries through modbus.
If the Amps drop at a certain value for 1 min, the batteries are full and the mppts are switched off for 1 hour, after that time they’re switched on again.
I’m planning on tinkering a bit, for instance if the powerusage goes up over say 1kW the mppts are switched on also, also implement SOC, f.i. if it drops say 3%…
Work in progress.
Anyhow, for now my batteries are loading untill they’re full.
One thing I wanted to try is put an older firmware into the mppts but victron professional only has 2.0.5, the same as I have.
Looking for 2.0.3, if anyone has it or know where to find it ?
