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Old 11-10-2023, 06:31 AM   #1
Junior Member
Brand: Thor Motor Coach
State: Arizona
Posts: 1
THOR #30414
Erratic charge

2023 BT36. Working on a lithium upgrade and have ran into an erratic charge cycle when lithium is at a low SOC. It has a 9855ad charge converter that should auto detect lithium. When SOC is low and I plug into shore power, it starts out at near 50amps and then starts to fluctuate down to 4-5 amps then back up. It keeps repeating this pattern until it levels out at a steady 15amp charge rate. Sometimes tripping the charge 50amp breaker by the battery box. Any ideas what’s causing this?
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Old 11-10-2023, 02:26 PM   #2
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,340
THOR #7035
Have you checked with WFCO regarding this behavior? Maybe because you have LiFePO4 batteries instead of Li-ion?

The WF-9855-AD Converter includes the exclusive, Patent Pending Auto-Detect technology. This microprocessor-driven technology will recognize lithium-ion and lead-acid battery chemistries and adjust the charging profile to match the battery type.
Maybe there's an incompatibility between the converter "smarts" and the battery BMS? Maybe you have a bad converter.
Ted & Melinda
2016 ACE 27.1
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