What we have learned
During our two-month ordeal, when we experienced problems on our various trips to Gettysburg and Boston, we had been studying the 2015 Roadtrek E-trek manual and corresponding with Roadtrek to try and answer some of the basic operation questions. Initially we thought our problems were due to our being new RVers–of course, we would learn after being serviced at Mercedes-Benz and our dealer that we were not to blame .
Since the Roadtrek E-trek is very different from traditional RVs (i.e., uses battery bank rather than propane generator), we needed to speak to a technician who was familiar with the particulars of the Roadtrek E-trek. Specifically, we needed to clarify some of the “known unknowns.”
- The percentage increase per hour charging by the various methods with everything turned off, so no power is being consumed: (1) driving, (2) idling, (3) plugged-into shore power with 30 amp, (4) plugged into shore power with 15 amp adapter, (5) solar charging sunny day, and (6) solar charging cloudy day.
- Define as a percentage what the E-trek manual (p. 85 FAQ: Electrical) means by “moderately depleted,” “adequately charged,” and “minimum battery charge.”
- The battery percentage which will trigger the inverter alarm and the same for the CO Alarm? (The Roadtrek E-trek Manual only makes vague reference to preserving a “minimum battery charge.”
In the meantime, we continued our own testing to see if we could finally charge the batteries driving, idling, and solar. We used an Excel spreadsheet to log our findings, which we had created in May after our second trip to Gettysburg Trip #5–More Technical Difficulties. The Roadtrek E trek Manual provides some idea of the expected charging times for driving, idling, plugging in, and solar; however, we had not been able to confirm our calculations with Roadtrek.
To see our spreadsheet, click the following link: Etrek Battery Log
We did eventually get a response from Roadtrek, who provided the following answers to our questions:
All our stats are in volts and watts, not percentages, so we are not able to give you answers in percentages, but please see below for responses to your questions.
Please confirm the percentage increase per hour charging by the various methods with everything turned off, so no power is being consumed:
- driving, while driving the under hood generator will be providing 3300 watts at 24 volts with 2000 RPM
- idling, 2000 watts at 24 volts @ 1000 RPM
- plugged-into shore power with 30 amp, , 50 amps at 24 volts
- plugged into shore power with 15 amp adapter, 20 amps @ 24 volts but it will depend what else it plugged into that 15 amp circuit
- solar charging sunny day, 30amps @ 24 volts
- solar charging cloudy day. This is subjective as how overcast is overcast, so it is not possible to give an answer on this question.
Please define as a percentage what the E-trek manual (p. 85 FAQ: Electrical) means by “moderately depleted,” “adequately charged,” and “minimum battery charge.”
- Full charge…..25.5 volts
- Moderately depleted…..24 volts
- Adequately charged…..23.5 volts and above
- Minimum charge ……21 volts
What is the battery percentage which will trigger the inverter alarm and the same for the CO Alarm? (The manual only makes vague reference to preserving a “minimum battery charge.”)
- The inverter will alarm at 21 volts and shut off at 20.5 volts
- The CO will run down to 7 volts before alarming
We have not taken a trip since receiving this information; however, we will continue testing and report our findings on future posts.