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Old 10-26-2016, 03:09 PM   #1
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Default What is low battery

Trying to get any information out of roadtrek not happening.
Picked 2017 Zion has solar with auto start the other day.

Manual likes to talk about low battery, but what is low?

Battery was 11.74v this morning but it been 12.64.
Co detecter went off manual said maybe low battery.
Engine comes on when battery gets low.

Talking to rt service they just side step the question. Go read this pdf which is just a page from the manual. But we did get the inverter figured out.

I just like to know how, when and why something works. I had a service company for 40 yrs it's how I think.

Thanks
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Old 10-26-2016, 03:27 PM   #2
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Originally Posted by Woodpaddler View Post
Trying to get any information out of roadtrek not happening.
Picked 2017 Zion has solar with auto start the other day.

Manual likes to talk about low battery, but what is low?

Battery was 11.74v this morning but it been 12.64.
Co detecter went off manual said maybe low battery.
Engine comes on when battery gets low.

Talking to rt service they just side step the question. Go read this pdf which is just a page from the manual. But we did get the inverter figured out.

I just like to know how, when and why something works. I had a service company for 40 yrs it's how I think.

Thanks
I guess you have the standard AGM house battery, not Ecotrek batteries, and the underhood generator with Voltstart to autostart the engine, is that correct?
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Old 10-26-2016, 03:59 PM   #3
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Most MFG include $ in their invoice for a through lesson of features and operation and prep of the unit. Sounds like the person delivering it to you didn't spend much time. Your dealer should be able to answer your questions or find out for you quickly.
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Old 10-26-2016, 04:05 PM   #4
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Originally Posted by gregmchugh View Post
I guess you have the standard AGM house battery, not Ecotrek batteries, and the underhood generator with Voltstart to autostart the engine, is that correct?


Yes that's what we have
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Old 10-26-2016, 04:30 PM   #5
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In the two Class Bs I bought from a dealer it was clear they did not know much other than the rudimentary stuff. The salesmen did not have direct experience. So, considering the technical differences of a Roadtrek EcoTrek compared to other RVs I suspect they are as much in the dark as the customer.

My first and new to RVing, the Pleasure-way Plateau, was a mystery but we covered just about everything in an hour orientation. The hour was overwhelming as it was and after I wish I had someone there to video it so I could have re-reviewed it.

When I bought my second RV, the Great West Van Legend, I had done so much research that I realized I knew way more than the dealer about their own product and didn't need much orientation.

The third, the Advanced RV, though I had again done a lot of research and participated in the building of it, I still needed two full days of orientation to go over all the systems at the manufacturer's shop reviewing everything with a team of people that actually designed the systems.

Some of these RVs are getting much more complex to understand. The manufacturers have to be more transparent about what they are selling and provide complete and detailed information. They can't leave it to dealers especially when they have a large network of them. In this day and age of PDF manuals and videos it shouldn't be too hard to provide full information and orientation.

To answer the OP, low battery is a discharged battery which equates to use of electrical systems in the B. It can be stated in voltage or depth of discharge. I believe when you discharge a battery 80% then Voltstart automatically comes on and recharges your battery. You have to be aware and learn what you can and cannot do with your B in regard to battery use and gain experience in how long a battery will stay adequately charged. Driving frequently and staying plugged into shore power to keep batteries charged will alleviate most concerns. Letting a B sit unattended and not connected to shore power is a concern and you need to know what to do, when to check, disconnect batteries, etc. That will come with experience.
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Old 10-26-2016, 04:40 PM   #6
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Yes that's what we have
I am not positive what the trigger voltage for AGM batteries is for the engine autostart but I think it is around 11.8 volts, maybe a little higher.

AGM batteries are typically recharged when they get to around 50% discharge which is around 12.1 volts resting voltage but using 11.8 volts for the Voltstart is consistent since this is not resting voltage but voltage under a load.

The only thing unusual is the CO detector going off at that high of a voltage but it may be that the CO detector is very sensitive to voltage.

You might want to join the Roadtrek & Hymer Owners Group on Facebook if you want to connect with lots of Zion owners...
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Old 10-26-2016, 09:44 PM   #7
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Originally Posted by Woodpaddler View Post
Trying to get any information out of roadtrek not happening.
Picked 2017 Zion has solar with auto start the other day.

Manual likes to talk about low battery, but what is low?

Battery was 11.74v this morning but it been 12.64.
Co detecter went off manual said maybe low battery.
Engine comes on when battery gets low.

Talking to rt service they just side step the question. Go read this pdf which is just a page from the manual. But we did get the inverter figured out.

I just like to know how, when and why something works. I had a service company for 40 yrs it's how I think.

Thanks
Did the 11.74v you saw occur when running a large load?

Check to see if the AGM battery is the Northstar brand. If so, they have slightly different maintenance instructions than other brands. Some info: http://www.classbforum.com/forums/f5...html#post23162

Fully charged resting voltage (OCV) would be around 13.0V from the document I read.

You want to make sure to fully charge an AGM battery. The best way to know if the battery is fully charged is to use an ammeter to show the amps flowing through the circuit. I think the Northstar batteries will take up to 14.7V. When the amp flow has dropped to 1 or 2 amps in at 14.4V+ then the battery will be close to fully charged.
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Old 10-27-2016, 04:12 PM   #8
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Update
Reason under hood generator didn't come. The switch was off and nobody could find it either. Had to call rt and they looked up where they put it. Not on the power panel, it's by the drivers door. A small button the size of a dime, no label.
Dealers tech knows guy that works there and able to get the info. The engineer that came up this wasn't at the top of the class.
Well the voltstart comes on around 11.5 v . But the kicker is the co / propane detecter starts beeping on low voltage at around 12.1.
Got be away to fix that
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Old 10-27-2016, 04:21 PM   #9
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12.1V is a low voltage if no load or very low load.

It's much harder to pick a one size fits all trigger voltage for voltstart with AGM's. If I had to choose I would probably pick 12.0V or maybe a bit more. That would keep the AGM's above 20% SOC if low load draws (like the fridge) were what caused the voltstart to activate. Volstart would kick in more often with large loads (maybe even all the time) but that would be good for the AGM's.

You might be able to request a volstart module with a trigger set-point based on your particular usage needs.

Have you tried fully charging the batteries by plugging in for 24 to 36 hours or so? I think you need to get the battery fully charged then see if solar will keep it topped up.
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Old 10-27-2016, 04:27 PM   #10
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12.1V is a low voltage if no load or very low load.

It's much harder to pick a one size fits all trigger voltage for voltstart with AGM's. If I had to choose I would probably pick 12.0V or maybe a bit more. That would keep the AGM's above 20% SOC if low load draws (like the fridge) were what caused the voltstart to activate. Volstart would kick in more often with large loads (maybe even all the time) but that would be good for the AGM's.

You might be able to request a volstart module with a trigger set-point based on your particular usage needs.

Have you tried fully charging the batteries by plugging in for 24 to 36 hours or so? I think you need to get the battery fully charged then see if solar will keep it topped up.
Very true. If the air conditioning is on, it could draw down a 2 AGM battery system (200ah or so) to 12.0 volts while they were still at a high SOC. Tough call as to where to set things to be safe on low loads, without tripping early on big loads. Sure would be nicer to have a SOC activated system, so the problems go away.
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