Sticking with 3 parallel strings minimizes the problem, but a single string is best. When doing both series and parallel, do not cross connect the batteries in the middle of the series strings. . Whenever possible, using a single string of lithium cells is usually the preferred configuration for a lithium ion battery pack as it is the lowest cost and simplest. Some Lithium batteries can do more than 3. Some packs may consist of a combination of series. . For a full comparison between SLA (sealed lead acid) and lithium batteries, see our detailed guide.
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Can a lithium ion battery pack have multiple strings?
Whenever possible, using a single string of lithium cells is usually the preferred configuration for a lithium ion battery pack as it is the lowest cost and simplest. However, sometimes it may be necessary to use multiple strings of cells. Here are a few reasons that parallel strings may be necessary:
Why are parallel lithium strings important?
Since lithium cells must be managed on a cell level, parallel lithium strings dramatically increase the complexity and cost of the battery management and introduce many additional points of failure and failure modes not found with a single string.
How many batteries can a lithium battery run in parallel?
3 batteries in parallel (or 3 strings in parallel) is the limit recommended by most lead-acid battery manufacturers. Some Lithium batteries can do more than 3. The above limitations are important to follow because variations from one battery to the next cause the current to not distribute equally.
What is a battery string?
A "string" is a series connection of either batteries or solar panels to achieve a specific voltage. So, for example, a string of four 6V batteries wired in series makes a 24V battery BANK. You need to wire at least three 30V solar panels in a series STRING to get the voltage high enough to charge a 48V battery.
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