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Old 09-13-2014, 08:34 AM   #1
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twice a day charging

Im sure this has been asked before but how much does it shorten battery life to run a generator twice a day versus once a day. My battery compartment limits me to just 2 group 27 batteries. it would take major alterations to add more batteries. We have camped for more years then I care to remember but not a lot of dry camping. I want to spend a couple months this winter in the West mostly boon docking. Your thoughts would be appreciated.
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Old 09-13-2014, 09:06 AM   #2
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What type of batteries are we talking about? How old are the batteries? Marine/RV or TRUE deep cycle batteries? Does your TT have a newer model charge controller or older model? What year is your TT.
Don
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Old 09-13-2014, 10:20 AM   #3
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2011 31.5 RLTS 5th wheel. Has a multistage converter. The current batteries are original to the trailer. They are group 24 marine batteries. I intend on replacing them with group 27 deep cycle from US battery. The size of the battery box(not tall enough)dictates 12 volt instead of the preferred 6 volt.
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Old 09-13-2014, 11:02 AM   #4
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Quote:
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snip..... how much does it shorten battery life to run a generator twice a day versus once a day......snip
I guess it depends on the DoD (Depth of Discharge) at each recharge.

A shallower average DoD will increase battery life. A deep cycle battery with an average 50% DoD will last at least twice as long as an 80% DoD. A typical GC-2 deep cycle battery will average 225 cycles at 80% DoD, but will increase to 750 cycles at 50% DoD.

With a standard RV/Marine battery one doesn't get as many recharge cycles as a true Deep Cycle battery under similar DoD conditions, and can't take as deep of DoD as a true Deep Cycle on a regular basis.

Bob
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Old 09-13-2014, 11:27 AM   #5
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I have been "dry camping" out in the shed in front of the house for the last week or two trying to simulate real life conditions. A 1600 watt inverter that I installed has compounded the issue to some extent. I have spent the evenings and nights in the camper watching a little TV and doing pretty much what we do on the road. I sleep with a CPAP machine that runs on dc power. All lights are now LED. By morning we are approaching 50% battery use. This is on those 3 year old group 24 batteries. Even with new group 27's I question if i could go all day with one charging without a deep discharge.
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Old 09-13-2014, 11:43 AM   #6
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Is your CPAP power transformer a 12VDC transformer? Look at the voltage/amp specifications on the transformer. If the transformer output is 12VDC then you are in luck, you can convert it to run only off of your TT battery and not use the inverter.

US Battery has some GREAT batteries, they will be my next ones that I buy... funny I am wearing one of their Tee shirts as we electronically speak....

Let me know.

Don
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250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
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Old 09-13-2014, 11:46 AM   #7
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I agree, the inverter and CPAP add to your personal battery power usage when dry camping. Everyone's battery usage and recharge requirements are different.

In my case I can go 2-3 days before having to recharge my (2) 6V Deep Cycle's, and I average a 30% DoD.

Bob
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Old 09-13-2014, 12:02 PM   #8
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Quote:
Originally Posted by Mustang65 View Post
Is your CPAP power transformer a 12VDC transformer? Look at the voltage/amp specifications on the transformer. If the transformer output is 12VDC then you are in luck, you can convert it to run only off of your TT battery and not use the inverter.

US Battery has some GREAT batteries, they will be my next ones that I buy... funny I am wearing one of their Tee shirts as we electronically speak....

Let me know.

Don
The CPAP runs directly off of a 12 volt outlet. It runs off of a DC transformer. I in truth have been pushing the envelope some with this inverter try to establish my limitations. I have run water thru our coffee maker in the morning which takes 960 watts of power for 10 minutes. We have always used an electric coffee pot and would like to continue. Hence the question comes up about running the genny twice a day.
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Old 09-13-2014, 12:03 PM   #9
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Thanks to both of you for your input!!!
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Old 09-13-2014, 03:04 PM   #10
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In my opinion, it would keep your batteries in better shape by charging twice a day. Doing that, the batteries will experience less of a depth of discharge than when charging just once a day.

And you mentioned that your limiting factor to moving up to only group 27's instead of 6 volt batteries was the battery box. That can be changed out. My TT came with one group 27 originally. I wasted money by buying another group 27 and a second battery box, because one year later I bought a pair of Trojan 6V batteries and an appropriate box. You might as well spend more money up front and upgrade to true deep cycle 6V batteries, instead of going with Marine batteries again. JMHO.

Good luck. A TT electrical system is a joy to learn about.

Edited: Just re-read your post and realized that you didn't mean a battery box, but a compartment that would be difficult to modify. Check out the Trojan website. I believe there are true deep cycle 12 volt batteries of the correct size you could use instead of using Marine batteries.
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