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05-04-2015, 03:22 PM
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#2
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Senior Member
Join Date: Jan 2014
Location: Aurora CO
Posts: 2,334
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I use this one
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Jim & Kim from Colorado
2014 Eagle 30.5 RLS
2015 Dodge 3500HD SRW 6.7L
Click on my profile for Mods and notes
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05-04-2015, 03:57 PM
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#3
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Senior Member
Join Date: Dec 2014
Location: FL
Posts: 11,281
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Voltage @ 50% remaining charge?
Quote:
Originally Posted by Owen Stubbs
snip
My understanding is that we never want to fall below 50% remaining charge to prolong battery life. So, looking for a good chart to print, I find lots of variation... snip...
So..... at which voltage level to YOU feel is closest to 50%??
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It's a battery life issue. As far as I know, there is no sudden death if the batteries ever drop to, or a bit below, 50%. You just want to plan on not going that 'low' or lower on a regular basis if it can be helped.
Bottom line, my take is that it's a judgement call to be made by the person that will be buying the batteries.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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05-04-2015, 04:13 PM
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#4
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Senior Member
Join Date: Dec 2010
Posts: 1,645
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In addition to the expert's disagreement as to the proper 50% discharge voltage level, complicating things further is that the voltage measurement should be made under no-load and also after the battery has rested a bit.
I use 12.1 volts as the cutoff point, but I seldom get that low.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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05-04-2015, 07:54 PM
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#5
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Senior Member
Join Date: Mar 2015
Location: Havre
Posts: 148
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This is the chart I use. I have an alarm from MTR Designs so I don't have to guess and constantly check a volt meter or charge controller. It begins blinking yellow when I am within .25 volts of my set alarm (12.2 volts) and then it sounds an alarm when it gets to 12.2. Here is the link if you are interested:
Battery Failsafe Devices
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Todd Klassy
https://www.toddklassy.com
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05-04-2015, 08:12 PM
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#6
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Senior Member
Join Date: Sep 2011
Location: King George
Posts: 2,761
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I just use 12.0VDC to tell me I am probably close enough to 50% charge state and stop using my batteries until they get re-charged again...
12.0VDC is easy to remember for me....
Roy Ken
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Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"
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05-05-2015, 05:19 AM
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#7
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Senior Member
Join Date: Dec 2009
Location: Maplesville - Home Base
Posts: 3,059
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When converting my new Designer from 12v batteries to two 6 volt golf cart batteries I wanted to know the battery manufacturers opinion on low discharge levels. Having had a 36v (six battery) golf cart for years with Trojan batteries I wrote to Trojan asking about the voltage level to be considered minimum for no damage to their T-105 batteries that I now have. Here is their response from October 2010:
Below is Trojan Battery's response:
We never want you to discharge your batteries below a 20% state of charge (80% depth of discharge). For a 36 volt system of batteries this would mean you never want to go below about 35 volts. The voltage of 34.9 volts is an open circuit voltage, which means the batteries would be at rest. For your 12 volt RV system, a 20% state of charge would be an open circuit voltage of 11.6 volts. Thanks.
If you have additional comments or questions, please contact me at the information below.
Sincerely,
Stacey Delzeit
Product Engineer
Trojan Battery Company
sdelzeit@trojanbattery.com
678-518-7378
__________________
Ed
KM4STL
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50X, TST Systems 507 TPMS, RV Flex Armor Roof
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05-05-2015, 05:43 AM
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#8
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Site Team
Join Date: Nov 2012
Location: Clearwater, FL area
Posts: 5,196
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Quote:
Originally Posted by edatlanta
Below is Trojan Battery's response:
We never want you to discharge your batteries below a 20% state of charge (80% depth of discharge). For a 36 volt system of batteries this would mean you never want to go below about 35 volts. The voltage of 34.9 volts is an open circuit voltage, which means the batteries would be at rest. For your 12 volt RV system, a 20% state of charge would be an open circuit voltage of 11.6 volts. Thanks.
If you have additional comments or questions, please contact me at the information below.
Sincerely,
Stacey Delzeit
Product Engineer
Trojan Battery Company
sdelzeit@trojanbattery.com
678-518-7378
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Here is the Trojan Battery Companies Life-Cycle chart (Copied from the TROJAN Battery web site) for the T-105. Sure you can take it to the 20% level but it will have a major effect on the Life of the batteries. Note the Trojan response did not include the word REPEATED occurrences.. If you use the 50% limit, you could be rewarded with 500 extra days of use.
Just my thoughts,
Don
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