![]() In these cases, the tail current must be set higher than this threshold.Īs soon as the battery monitor detects that the voltage of the battery has reached the set “Charged voltage” parameter and the current has dropped below the “Tail current” for a certain amount of time, the battery monitor will set the state of charge to 100%. Remark: Some battery chargers stop charging when the current drops below a set threshold. The “Tail current” parameter is expressed as a percentage of the battery capacity. The battery is considered as “fully charged” once the charge current has dropped to less than the set “Tail current” parameter. For lead acid you will want at least 50% Tail Current (%) get as many cycles out of it as possible) then increase your floor to 10% or 20%. Basically this is the amount (in percentage) that you want to not be part of the normal 100% of usable energy in your battery.įor those that want to make their battery last longer (ie. Helps to calculate remaining time of battery (based on current rate of discharge … hmmm the current current). the diff between highest and lowest cell exceeds 0.1v) then drop the Charged Voltage down to 13.9 or even 13.8. If your LiFePO4 cells are slightly out of sync (i.e. In this case, set the Charged Voltage in your shunt to 14.0v or even 14.1v. ![]() In fact, if you choose the LiFePO4 setting for most Victron chargers the default bulk charge voltage for a 12v system is 14.2v. This is also the default for a Victron Multiplus when LiFePO4 is chosen. In our case, we set our JK BMS with active balancing to 3.55v high-volt-disconnect (per cell meaning a total of 14.2v for the battery). it’s still accepting charge).īefore we even get to the SmartShunt settings you’ll want to make sure your BMS and charger are similar. Let’s flesh this out a bit as getting it wrong usually causes the shunt to report 100% SOC too early (i.e. The Victron manual states: The “charged voltage” parameter should be set to 0.2V or 0.3V below the float voltage of the charger. As soon as the battery monitor detects that the voltage of the battery has reached the “charged voltage” and the current has dropped below the “tail current” for a certain amount of time, the battery monitor will set the state of charge to 100%. The battery voltage must be above this voltage level to consider the battery as fully charged. If you have multiple batteries simply add the capacities together.Ĭommon LiFePO4 values are: 100Ah, 230Ah, 280Ah and 300Ah. This setting is relatively simple, if you have a single battery it’s really easy (the stated capacity of your battery in Ah) If your battery capacity is stated in Kwh then divide by the voltage of your battery. The setting is the battery capacity in Amp hours (Ah). This setting should already have been done during the initial installation. This parameter is used to tell the battery monitor how big the battery is. Before we even get to the settings, please note that these three parameters work together to determine when your battery is at 100% State of Charge (SOC):
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