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TROUBLESHOOTING LITHIUM
A guide to troubleshooting both prebuilt and DIY lithium batteries
What might cause lithium batteries to fail?
There are many reasons why a lithium battery may not be working as expected. Some
of these common problems for lithium batteries are outlined in this guide.
Contents:
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Charge settings incorrect
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Low capacity, battery not running for as long as it should
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Prebuilt Batteries
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DIY Lithium
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Lithium batteries are made up of a set of cells,
a BMS (battery management system), and
a balancer. Lithium batteries always require
protection circuitry (a BMS) to protect them.
For prebuilt batteries, the BMS and balancer
are built inside the battery. Lithium cells
are sensitive to over-voltage, under-voltage,
temperature, and high currents. It is the BMS'
job to protects the cells from these damaging
conditions.
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Table of Contents
Related Manuals for Drypower 12LFP200PS
Summary of Contents for Drypower 12LFP200PS
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Page 1: Table Of Contents
TROUBLESHOOTING LITHIUM A guide to troubleshooting both prebuilt and DIY lithium batteries Lithium batteries are made up of a set of cells, a BMS (battery management system), and a balancer. Lithium batteries always require protection circuitry (a BMS) to protect them. For prebuilt batteries, the BMS and balancer are built inside the battery. -
Page 2: Universal Issues
Universal Issues Applies to most lithium batteries whether DIY or Prebuilt It is important when charging lithium batteries to always use a lithium compatible charger with the correct charge profile selected. This will ensure that the battery charges to the correct voltages without tripping the BMS protection circuit. Tripped BMS, battery too flat: If your lithium battery has been discharged to fully flat, the BMS will switch the battery off to protect the battery. -
Page 3: Shunt Settings Incorrect
Shunt settings incorrect: Symptoms: Fix: • Battery percentage shown on the • Follow the instructions for your shunt shunt is inaccurate to set the correct settings. If you have a Victron shunt purchased from Alt- Tech, please refer to the settings sheet you should have received. -
Page 4: Resetting A Bms
Prebuilt Issues When talking about prebuilt lithium batteries, we are referring to batteries that are premade by a manufacturer. They are commonly fully sealed with a BMS built in. Resetting a BMS If your BMS has tripped it will need to be reset: 1. -
Page 5: Incorrect Cell Wiring (Very Common)
DIY Issues Common fixes for batteries built from lithium cells Incorrect cell wiring: (Very common) Symptoms: Fix: • Balancer damage • Ensure there are no loose connections • BMS damage • Make sure the sense wires are con- • Cell bulging/damage nected in the correct order and to the correct cell •... -
Page 6: Unbalanced Cells
Unbalanced cells: Fix: • Attempt to encourage the cells to balance by discharging the pack using a light load and slowly charging the pack. This can help the balancer do its job more effectively. • Check your balancer is working correctly. Ensure that it does not appear damaged and that all the appropriate indicator lights come on. -
Page 7: Damaged Balancer
Damaged Balancer Symptoms: • Cells going out of balance • Balancer looks burnt or capacitors have come off Fix: • Commonly the balancer fails because it was connected while the sense wires were installed on the cells. Having sense wires partially connected to the balancer, either while installing or due to loose connections, WILL...
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