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12V Batts Combined in SERIES - Different Size/Capacity OK?
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<blockquote data-quote="clarkbre" data-source="post: 456914" data-attributes="member: 2634"><p>The motor won't care that the batteries are different capacities. As stated above, the motor will draw what it can and stop once there's not enough voltage.</p><p></p><p>However, the charger is where you will run into potential issues...but there's a way around it. If charged together as one, 24v unit, the batteries will show the charger a false full capacity. In short, the charger will average the capacity of the batteries and charge to that. The D31M is 66ah and the D27M is 75ah. So, the 24v charger will charge to 141ah but it will be divided equally to both batteries. Essentially, one will be under charged and the other will be over charged.</p><p></p><p>Now, how can you do this set up correctly? Split the middle. It should be ok running both batteries for the motor; however, when charging, they should be separated as two, 12v batteries that are charged individually. For this, you will need two chargers or a 2 bank charger and a mechanism to break the center connection between the positive and negative on the batteries.</p></blockquote><p></p>
[QUOTE="clarkbre, post: 456914, member: 2634"] The motor won't care that the batteries are different capacities. As stated above, the motor will draw what it can and stop once there's not enough voltage. However, the charger is where you will run into potential issues...but there's a way around it. If charged together as one, 24v unit, the batteries will show the charger a false full capacity. In short, the charger will average the capacity of the batteries and charge to that. The D31M is 66ah and the D27M is 75ah. So, the 24v charger will charge to 141ah but it will be divided equally to both batteries. Essentially, one will be under charged and the other will be over charged. Now, how can you do this set up correctly? Split the middle. It should be ok running both batteries for the motor; however, when charging, they should be separated as two, 12v batteries that are charged individually. For this, you will need two chargers or a 2 bank charger and a mechanism to break the center connection between the positive and negative on the batteries. [/QUOTE]
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12V Batts Combined in SERIES - Different Size/Capacity OK?
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