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Old 07-17-2015, 10:03 PM   #1
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Default The E-trek Blog

I've been reading the posts on The E-trek Blog with interest. After 2 1/2 years or so I still don't know much about the E-Trek so it's nice to finally see someone talking about voltages and state of charge etc.

Here's a link to the well written blog: www.theetrekblog.com

They even kept an Etrek Battery Log that is posted on the site.

Their E-trek battery bank is connected so that it is (or at least part of it is) 24 volts. Divide posted voltages in half for comparison if you are used to 12 volt battery systems.

One post mentions
Quote:
Adequately charged…..23.5 volts and above
- that's like 11.75V on a 12v system.

If you Google "12v SOC chart" you'll find many charts that indicate 11.75v at rest indicates a state of charge of 30%. You'll often see references that suggest limiting the depth of discharge to 50% to prolong the calendar life of a lead acid AGM battery. Those same charts indicate that 12.0 volts measured while the batteries are at rest indicates 50% SOC (state of charge).

Hopefully we'll see more technical type of discussions about the E-trek emerge. It will be good info to refer back to as these rigs get older and pass onto 2nd and 3rd owners etc.
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Old 07-17-2015, 10:34 PM   #2
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That is pretty interesting stuff, and really nice to see folks putting the data out there.

We have always kind of wondered how they worked, and suspected that the only way they could get enough charge back fast enough to use again, would be if they were operating in the middle of the SOC most of the time. This would indicate that might be true, but more information is needed.

It will be fun to follow the reports and see how they shake out.
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Old 07-17-2015, 10:37 PM   #3
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Hmmm. I've looked at the blog, read some of it.

A bit odd that someone with no RV experience would jump into perhaps the most technologically advanced RV available (outside of custom-builds!).

I did look a bit at their voltage charts, as most of us with an ETrek have likely tried to do something similar. I think they are vastly overthinking the issues, though their numbers are interesting.

For me, using the ETrek as it was proposed, driving most, but not all, days while out on a trip, the rig has performed flawlessly. No alarms. No shutdowns. Plenty of use of the 120 volt devices.

I did recently pick up the Innova 12 volt meter discussed by others, and find that it does give me a better indication of the SOC by far than the 4-idiot-lights box. Just how that 12 volt reading correlates to the ETrek's 24 volt system is something I've yet to understand.

I'll continue to read that blog. Even though their problems are not my problems.
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Old 07-17-2015, 10:59 PM   #4
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the next issues will be on the ECOTREK blog.

th thing i got from this is what mark pointed out when i asked my voltrek/inverter questions.

12 volt inverter charger-10.5 volt warning 10 volt shuttdown

24 volt inverter charger 21 volt shut down.

i think many e-treks suffer from not having battery balancer.

Mary Ellen Stagg Capek has a post today about e-trek charging issues on the roadtrekking facebook page
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Old 07-17-2015, 11:23 PM   #5
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This topic could go in many directions. The whole add a balancer or not discussion would be very interesting I think. I read a bit about the balancers on the Roadtrek forum before it was shut down.

And, let's keep this topic positive. There are lots of happy E-trek owners out there.
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Old 07-17-2015, 11:26 PM   #6
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there are many e-trek owners. the battery balancer thing seems to come up regularly though.

i have no idea why it happens to some but not to others.
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Old 07-18-2015, 12:25 AM   #7
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Quote: "A bit odd that someone with no RV experience would jump into perhaps the most technologically advanced RV available (outside of custom-builds!)."
==================
Not odd to me. That's exactly what we did. The more technologically advanced, the fewer things a newbie needs to learn and keep straight. We eliminated the entire propane sub-system and any attendant learning curve, for example.
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Old 07-18-2015, 01:07 AM   #8
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That is why they are taking the approach of the system being automatic and not requiring any real user intervention. They want to dumb it down and make it appeal to the ordinary user, not the tinkerer's we have on this forum.
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Old 07-18-2015, 01:09 AM   #9
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I don't really understand the discussion of adding a balancer. The BMS should do cell balancing. The Smart Battery has this built in. They claim that since they match cells very closely, that this function would rarely engage. But these are "toy" cells I guess, so who knows what Jim's need.
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Old 07-18-2015, 01:20 AM   #10
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The balancer / equalizer mentioned here is used when you have both 12 volt and 24 volt systems. It maintains battery balance so you can draw 12 volts from some of the batteries without drawing those batteries down disproportionately.
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