This process will continue until all cell voltages are within 0.01V of each other. Each cell voltage is monitored and if required, energy will be moved from the cell(s) with the highest voltage to the cells with a lower voltage. This ensures that all cells will be balanced. The battery has built-in "active" and "passive" cell balancing. Lagging cells will not be charged further unless they receive "help" with this from cell balancing electronics.Ĭells do not get damaged if they have different balance levels, but the imbalance will manifest itself in a (temporary) battery capacity reduction. The current through a lithium cell however, when fully charged, is almost zero. This current helps to fully charge the other cells that are lagging behind, thus equalising the charge state of all cells. The same happens in a lead-acid battery, but there the cells self-correct without the need for cell balancing electronics because a small current will continue to flow even after one or more cells are fully charged. If the cells are not regularly balanced these differences will increase over time. Therefore, when cycled, some cells will be charged or discharged earlier than the other cells.
Though carefully selected during the production process, the cells in the battery are not 100% identical. The 12.8V battery has 4 and the 25.6V battery has 8 cells in series. The battery consists of lithium cells that are connected in series. More ventilation space is needed around the batteries and depending on the installation, hot air extraction or forced air cooling might be needed. But be aware that the batteries will produce more heat when high charge currents are used. This will charge the battery in half an hour. The maximum charge current is 2C, for a 100Ah battery this is 200A. A charge rate of 0.5C for a 100Ah battery is 50A charge current. This means that if the battery is completely empty, it will take 2 hours to charge the battery. The storage stage is not per se needed for a lithium battery, but if the charger has a storage mode, set the storage voltage at the same value as the float voltage. Once the absorption stage has been finalised, the battery charger goes into float. No damage will occur if there are small differences in individual battery voltages because of varying cable resistances or internal battery resistances. Float voltage should always be 13.5V (27V).īecause of the flexibility in charge voltages, up to 20 batteries can be connected in parallel without much problems. We recommend 14.2V (28.4V) as the absorption voltage, but if you want to change it, we advise keeping it between 14.0V (28V) and 14.4V 28.8V). However, this is impossible on a properly installed system. Should a cell reach 4.2V, all charge into that cell will be dissipated as heat.
Lithium batteries will become permanent damaged if they are over-charged. The charge voltage may vary anywhere from 14V to 15V for a 12.8V lithium battery and 28V to 30V for a 25.6V lithium battery, as long as no cell is subjected to more than 4.2V. Lithium batteries are easier to charge than lead-acid batteries.
#Battery status discharging install
Download and install the VictronConnect app The battery alarm signals and BMS actions Maximum number of batteries in series, parallel or series/parallel configuration
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