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Old 08-28-2013, 06:45 AM   #1
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All electric 8 (and more) battery run times

For the "all electric" newer Newmars without added solar panels-

How long can you folks typically go on the batteries dry camping (typical living without A/C of course) with res. refer running without starting the genny, or driving in between? (please state # of batteries 8 or over)

What is the typical alternator output on these type units?

I know this is very general so just looking for general answers as the trend has gone this way and we're interested to know if it's 1-2 days or much more.
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Old 08-28-2013, 09:28 AM   #2
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I have not tried to go "dry camping" to the point of stressing over when the generator would run. So my information will not be exactly what you are after.

I have 8 AGM batteries. I also installed the BMK, along with the upgrades to the EMS system to allow the AGS/BMK and EMS to all work together.

I never worry about shutting down the Media Server (see blogs), Wii-U, PS3, DirectTV, and various wall adapters for charging iPhones, iPads, etc. The kids leave these things plugged in all the time. The point is, there is plenty of phantom and non/phantom draws that I just have not worried about.

I have setup the AGS to start the Generator when the batteries reach 60% SOC, which is a very conservative number.

While on our trip last month, I had to go to a dealer for service. We dropped the coach off at 8:00am, with the generator off, and the batteries at 100% SOC. I used this as the first test to see how long it could go before the generator would start.

We picked the coach up at 4:30p, and the batteries where at 86% SOC. The only real draw would be the 2 refreigerators (Big Residential, and the slideout). I was happy with that number.

Another night we parked in a retail box parking lot @ 9pm, and it was quiet enough & cool that we opened the windows, and left the generator off. Watched TV, kids played on the big tv, charged laptops, and even popped some popcorn. Next morning, 8:00 am, batteries where at 72%. I noticed that the girls had used the hair iron, and the hair dryer was going when I looked at the gauge.

Personally, I thought this was great performance, because that 11 hours saved me approx $40 of diesel fuel.

Driving down the road, the alternator does a great job of topping off the batteries for normal usage, so if we don't need the AC (which is rare), then I won't run the genny. I did not use the alternator to recharge the batteries from the 72%, I waited until it was fully charged before shutting it down.

One thing about the BMK, it does not measure the charge returned from the alternator, or if it does, it is not very accurate. I need to test this further, and document how it operates. I believe that it was only measuring a charge put back in via the inverter. This is most likely a software issue, that I am hoping can be corrected. I will be contacting Magnum Energy about this.

Hopefully I have answered some of your question. I am sure others will have more 'boondocking' experience.
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Old 08-29-2013, 11:17 AM   #3
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Any more all electric Newmars out there who care to comment on the OP ?
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Old 08-29-2013, 02:25 PM   #4
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Qwert66 ... not sure I have a whole lot to really help, but we have had two (2) all electric coaches - a Ventana and now a Dutch Star. Both had eight (8) of the standard wet cell batteries ... but the only "dry camping" we did was just an overnight at a rest area or Wal-Mart. When we did do that, we did run the coffee maker, microwave, hair dryer, lights and all of the smaller type of uses and never had any issues. I knew if I did run the house batteries down, I could always start the generator or even the engine to get things charged back up. I know the engine uses the chassis batteries but I can't remember which ones the generator uses to start.

We have been very happy with the "all electric" option.

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Old 08-29-2013, 07:56 PM   #5
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We're in the same boat as the other 2. We only over night, but we run the genny a lot less with this coach.
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