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Thor uses a common converter in a lot of their coaches - a WFCO™ 8955. I can't say for sure it's what they use in the Sprinters, but it's what came in our Axis.
It is a 3-stage converter that *should* treat the batteries well. I did a lot of research trying to find out if I could leave the coach plugged in all winter. Unfortunately I found a lot of negative information on the WFCO on various forums. The main complaints seem to be that it won't go into "bulk" mode to fully charge depleted batteries and issues boiling batteries in "float" mode.
We're first-time RV owners with no direct experience so based on what I was able to find I'll be leaving the bus unplugged this winter. I may upgrade to a Progressive Dynamics PD4655V next year depending on how our WFCO performs. The PD is a smart, 4-stage unit with a very good reputation as far as I can tell.
Regards,
Randy
Randy
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