ROEM

the batteries are less than two (2) years old.

Sorry for late reply. I did not receive notification of replies. I am certain the above has to do with faulty batteries, but my supplier does not agree (due to warranty? Batteries are less than two years old). What I would like to know is how the absorption time is maintained. Apparently the absorption kept on going long after the set absorption time. I wonder why the system did not stop itself after reaching the maximum absorption time. I am just curious how the absorption stage is maintained by the Multigrid II 48/3000/35/32 230V. I suspect not only time is calculated but something like voltage is verified as well? I realise for this answer I need somebody who is familiar with the Multigrid software.

I have a malfunction during loading of batteries. As I am not sure what is the cause I like to ask users if they have similar experience. I have a grid-tied system intended as back-up system including excess solar feed in into grid. Some particulars:Solar panels 2,4 kwPSmartsolar MPPT 150-100Multigrid II 48/3000/35/32 230VColorControl GX4x12V-136Ah lead acid batteries (third party). ESS is applicable with mode "keep batteries charged" and "feed-in exces solarcharger power". Also absorption voltage and float voltage according manufacturer's specs. During the night we had a grid-failure. After return of the grid system started reloading batteries. First in bulk stage and after reaching absorptionvoltage system switched into absorption mode. About 30 minutes in absorption mode voltage slowly dropped and current was kept steady. Normally absorption should have stopped but this did not happen apparently. As it was during the night (and we were asleep) we did not notice this until the next morning. The result has been that batteries have been charged with approx. 1500W for 9 hours continiously in absorption mode while my batterysystem has only 6,5 kW capacity. I wonder what might have caused the system not to stop absorption (t.i. switch into float)? Any advice will be highly appreciated.

I was under the assumption that I need a password as per manual: VictronConnect - VE.Bus Configuration guide Edit this section # Warning :⚠️: The features described in this document are powerful tools. They are intended for use by Victron-trained Engineers, Installers and Dealers. Its usage must not be attempted by system Owners and Users. Configuring our Inverter/chargers, such as Multis and Quattros, requires both training and experience. Victron offers no direct support for un-trained individuals carrying-out configuration. Settings are protected by a password. This password is provided with Victron training. Please contact your Victron Distributor for further information I have had contact with installer/distributer now. I will let you know the outcome in due time.

Hello Plonkster, Thank you for your quick reply and explanation. This is what I was hoping for. For your information: I am just a user (but with a little knowledge about electrical systems due to my merchant marine background). I already contacted my installer/suplier about this but no response from him. He also did not supply me with the tools (password etc) to look for myself inside VE Configue. I only have acces to the Color Control. Yes, float voltage is stable. Correct. Ok. This is clear for me. I will contact my supplier again and request him to either check this setting or supply me with the password, so i can do it myself. Then I will monitor it a couple of days and let you know the outcome. Thanks again

Hello, I have some questions for which I have not found an answer/reply yet on the internet and victron community forum. I hope some of you can help me with the following: I have a grid-tied system intended as back-up system including excess solar feed in into grid. Some particulars: Solar panels 2,4 kwP Smartsolar MPPT 150-100 Multigrid II 48/3000/35/32 230V ColorControl GX 4x12V-136Ah lead acid batteries (third party). ESS is applicable with mode "keep batteries charged" and "feed-in exces solarcharger power". Also absorption voltage and float voltage according manufacturer's specs. This is working well except that I noted that during daytime (solar available; inverted to 230V and used for load and feed-in) the batteries are being discharged in small amounts as well. It looks like the more solar inverted (i.e. fan on multigrid) the higher the discharge rate of the batteries will be (max approx 100W). The result is that at the end of the day SOC of the batteries has been lowered and overnight it is being kept steady (including floatvoltage is maintained). So each day the SOC of the batteries is lower (approx 7-8%). For this I have two (2) questions: 1) How are the batteries supposed to be charged again? I assume "keep batteries charged" means on or up to SOC 100% (for back-up reasons). 2) Each day my batteries have lower SOC but the voltage is steady floatvoltage. How does this effect the start of the charge-sequence as according to manual switch float-to-bulk will be at 1.3V below float voltage? And eventually will it recognise the dynamic cut-off as float voltage is kept continious? At this moment the only option I know is to reset the system in order to start Multigrid in bulk. For now this is okay to reset the system once every couple of days. But when I leave home for longer periods and I am not able to reset? I would appreciate some help and/or clarification with this. Thanks in advance.