![]() ![]() Instead of two ETX900 in series use one ETX900-24 Instead of two ETX900 in parallel use one ETX1600 Instead of two ETX680C in series use one ETX680-24-VNT or ETX900-24 Instead of two ETX680C in parallel use one ETX1200 Instead of two in series use one ETX400-24 Instead of two ETX18 in parallel use one ETX36 Please contact us for applications using battery models not shown in this document. However, when our batteries are connected in series and or parallel we recommend you don’t exceed the values shown in Table 1 below. Our EarthX batteries have the capability of extremely high discharge rates and charge rates. When two batteries are put in parallel the continuous discharge amp rating and charge amp rating is typically reduced to 90% of the two batteries’ combined rating. For example, the normal maximum charging voltage for a single battery is 14.6V, but when two batteries are put in series the combined normal maximum charging voltage is reduced to 28.8V. ![]() See the example below for series wiring (Figure 5).īased on extensive testing and knowledge of the cells and BMS design, our battery’s nameplate ratings are de-rated when used in parallel and or series configurations. If you replace one battery, you must replace the other battery. If you charge one battery you must charge the other to an equal charge level. Both batteries in a series configuration must have the EXACT same load, meaning you cannot connect a load to just one battery in the series. It is important to use the same battery model with equal voltage and capacity (Ah) and never to mix batteries of a different age. Unlike parallel operation, series operation or series/parallel operation requires thoughtful engineering and maintenance to make the system function properly. In situations where the batteries are automatically connected/disconnected there must be external equipment to limit the current to less than the batteries maximum charge current specification and/or interconnecting wire ampacity specification. If there is a large difference in charge level, high current can flow between the batteries. When connecting two batteries, it is important to make sure the charge levels are similar (voltages are within 0.3 volt) before connection. It is important to use the same battery model with equal voltage and never to mix batteries of a different age. To combine batteries in parallel, connect positive to positive and negative to negative as shown in Figure 4 right. Up to two batteries can be put in parallel. Like individual cells, you can combine batteries together in parallel to achieve higher energy/power (amp-hours, amps). Please contact EarthX for additional information or application support. The wire and connectors used to make the series/parallel array of batteries shall be sized for the currents expected.ĭo not connect EarthX batteries with other chemistry batteries. It is always preferred to use a single 26.4 volt battery versus two 13.2 volt batteries in series, for the single battery can internally monitor each of the 8 cells in series and ensure the charge level of all cells are balanced. This restriction is due to the fact that impedance, capacity, or self-discharge rates vary between cells and between batteries. For applications with more than two batteries in parallel, please contact EarthX tech support.ĮarthX batteries are NOT approved for series operation without EarthX’s engineers design approval. The restriction to two batteries allows for normal variations in one battery without adversely affecting the other battery. Multiple Batteries in Series and or Parallel (each battery with its own BMS)ĮarthX batteries are approved for use in applications with up to two batteries in parallel, with no additional external electronics. An over-discharged battery typically has a voltage less than 11.5V (< 2.8V per cell). The BMS also disconnects the battery from the load if it is drained to less than 5% remaining charge (an over-discharge condition). The BMS has circuitry to block charging if the voltage exceeds 15.5 volts (or if any cell’s voltage exceeds 3.9V). This ensures that the charge level of all the cells remains equal, even with the high discharge (> 100Amps) and charge current (>10Amps).Ī cell can be permanently damaged if over-charged (over-voltage) or over-discharged (drained) just one time. If the voltage of a cell exceeds the others, the BMS circuits will work to reduce that cell’s charge level. Figure 3 Battery Management System (BMS) Cell ProtectionĪ BMS continuously monitors each cell’s voltage. ![]()
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