Why Won't WFCO Converter Charger Go Into Bulk Mode For Lithium Batteries?
Published 02/17/2026
Products Featured in This Question
Question:
Why won’t my WFCO converter go into bulk mode for lithium?
asked by: Josh
Expert Reply:
Hey there Josh, sorry about the issue you're having.
WFCO Auto-Detect converters like 45A # WF58FR or 100A # WF56FR monitor charge cycles and battery behavior before selecting a profile. The lithium charge mode boosts to 14.6V in Charge Mode and can stay there 1–4 hours depending on load and battery state.
But things that can prevent bulk mode from triggering include:
-High DC loads during charging
-Solar charging is active
-Voltage drop from long or undersized battery wiring
If you're running solar at the same time or have heavy loads like inverters pulling current, that can prevent the converter from seeing the “discharged battery” condition needed to enter bulk.
What model WFCO converter is this? And do you know if any of the above issues could be going on? After getting a bit more info, I can further diagnose the issue for you.
Product Page this Question was Asked From
WFCO Auto-Detect RV Converter Charger - Deck Mount - 12V - 100 Amp
- Power Converter
- Converter Only
- Automatic Switch
- 12V
- 100 Amps
- AC to DC
- AGM
- Gel
- Lead Acid
- Lithium
- RV
- Multi-Stage Charge
- WFCO
more information >
Featured Help Information
Instructions
Continue Researching
- Search Results: rv transfer switch
- Q&A: Replacement Converter for WFCO WF-9855
- Search Results: wfco 9855
- Q&A: Replacement for WFCO 9855 Converter in Travel Trailer
- Search Results: alphathane
- Search Results: alpha systems rv roof repair
- Video: PowerMax PMTS Series Automatic Transfer Switch Review and Installation
- Shop: Progressive Dynamics 9300 Series RV Converter Charger - 12V - 45A
- Shop: Progressive Dynamics 9300 Series RV Converter Charger - 12V - 60A
- Shop: Alpha Systems 1010 Non-Sag Sealant for RVs - Black - 10.3 oz - Qty 1
- Shop: WFCO Auto-Detect RV Converter Charger - Deck Mount - 12V - 55 Amp
- Shop: WFCO Auto-Detect RV Converter Charger - Deck Mount - 12V - 45 Amp
- Q&A: Is Progressive Dynamics Replacement Section 4655V Compatible with Lithium Batteries
- Shop: PowerMax PMTS Series Automatic Transfer Switch - 30 Amp
- Shop: Progressive Dynamics Replacement Section for AC/DC Power Distribution Panel - 55 Amp
- Q&A: Difference Between The Alpha Systems 1021 and 5121 Self-Leveling Sealants
- Shop: Trailer Hitch
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams
- Search Results: trailer tires and wheels
- Shop: Trailer Wiring
- Q&A: Wiring Diagrams for Installing PowerMax PMTS Series Automatic Transfer Switch # PM79FR
- Article: How to Measure for Trailer Hitch Drop
- Video: Feature Review - Big Truck Big RV Trailer Jack Foot Scale with Tongue Weight Gauge
- Shop: Suspension Enhancement
- Search Results: trailer wiring
- Q&A: Lithium Compatible Converter To Replace WFCO WF-9855
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Video: In-Depth Look at the B&W 5th Wheel to Gooseneck Pin Box
on Power Converter
