#Victron bmv 712 app manual
#Victron bmv 712 app full

With a variable charge source like solar, sometimes the current drops below the tail current set value before full charge has been reached and the BMV syncs. Time to go, this is the period that both the voltage and current settings must be met before sync takes place, typically 5 minutes. Tail current, % of capacity, with 14.4 charge you need 4 amps per 100Ah, that's 4% (400 x 4% = 16 amps) The current must fall below this value for a sync to take place. Voltage, just below the charge voltage value to allow for device calibration variation, with a 14.4 charge voltage, 14.20 to 14.3 volts To use the automatic sync of the BMV the following parameters need setting in relationship to the charger settings,

#Victron bmv 712 app manual

Since the efficiency of the lithium is high, the BMV should track fairly well for a while, however a manual sync to 100% every so often is useful. Once this state is reached, using the app, set to 100%. If you are charging to 14.4, then one 100Ah battery is full when you are in absorption (voltage constant at 14.4) and the current drops to 4 amps, with 400Ah batteries that's 16 amps. Charge the battery bank to 100%, monitor the voltage and current to establish this. Stop the automatic synchronizing by adjusting settings out of range, for example, setting the voltage to a higher value than the charger maximum. You can set BMV712 to 100% capacity, either manually, or by adjusting the settings in the BMV712 to match the charger settings. The BMV syncs to 100% when a certain voltage has been exceeded and the current has fallen below a certain value for a certain time. Leave the charge efficiency at 99%, this does not determine the sync to 100% point. I calibrated the BMV for zero amps during installation. I'm charging the 400AH bank with 500 watts of solar and when we move the boat, my 90 amp alternator (which outputs about 60 amps). The batteries (with internal BMS units) are running pretty cool during charging at about 20C. Is it possible that high balancing current might be causing this suspected inefficiency? The BMS units have very large balancing resistors - perhaps 2 watt resistors. I took the top off the beautiful stainless steel case thinking I would find a mess that I could rework (the batteries were about $750 each so my expectations were low) but instead I found what looks like excellent quality and workmanship.

Instead, I bought no-name 12 volt, 200AH batteries locally. I was going to build my own batteries from cells from AliExpress but I couldn't get them shipped to NZ. What do you think about this? Reading has led me to believe that this number should be more like 95% but that's not what I'm experiencing. I keep making 2% adjustments down (rather than to put in the brain work required to calculate a more precise value) and am now at 91% and I think I might still need to drop it to perhaps as low as 87%. In using the system for the past two months, I've been watching the monitor as the system reaches 100% SOC and adjusting the charge efficiency factor setting to try to get the monitor to read 100% at about the same time that the battery reaches its 100% SOC voltage (system set to 14 volts). I have a new BMV-712 battery monitor installed with my new LiFePO4 system.