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Open Roads Forum  >  General RVing Issues

 > Max Depth of discharge

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brianosaur

Long Island

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Posted: 06/13/20 11:29am Link  |  Quote  |  Print  |  Notify Moderator

Whats the max depth of discharge on deep cycles again?
Percentage and voltage?
For double GC 6v and/or single 12v? (I had thought they were different)

I replaced my TT last June which had 2GC 6v and havent upgraded the new one yet. It still has the single deep cycle 12v house battery from the dealer.

Now that NYS is finally out of lockdown, and the TT is dewinterized, we are taking off next week.

I had all this chart voltage percentage numbers in my brain last season but some stuff *just don't stick in there* like it used to.

gbopp

The Keystone State

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Posted: 06/13/20 11:38am Link  |  Quote  |  Print  |  Notify Moderator

I've found The 12 Volt Side of Life is very helpful for 12 volt system and battery information.

pianotuna

Regina, SK, Canada

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Posted: 06/13/20 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

50% for golf carts and true deep cycle lead acid batteries (800 cycles) The batteries need to be fully charged otherwise there may be permanent sulphation and capacity loss. Fully charge and equalize at least every seven cycles.


20% for Si02 (1500 cycles) or 50% (2800 cycles), zero maintenance, no sulphation so no need to charge to 100%. Can be used down to -40 About 1/3 the cost of LI

* This post was edited 06/13/20 03:08pm by pianotuna *


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Lwiddis

Mono Basin National Forest Scenic Area

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Posted: 06/13/20 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

There is no “max depth of discharge.” You trade discharge for life cycles. The less you discharge,the more cycles you get. See https://www.trojanbattery.com/pdf/Signature_Trojan_ProductLineSheet.pdf

Trojan says you can expect 1,250 cycles if you discharge to 50% on its Signature line.


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time2roll

Southern California

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Posted: 06/13/20 01:17pm Link  |  Quote  |  Print  |  Notify Moderator

You can discharge 100% (10.5 volts) and accept shorter life. Life needed may depend on use. Say you are part time and and make 10 trips a year and do an 80% discharge 3 times each trip. That is 30 cycles per year and they may still last 8 to 10 years. 240 to 300 cycles. Trick is getting them back 100% tip top charged and many converters cannot do this very well.

Otherwise close to 50% is a more practical goal. But I am not turning my furnace off if I go a bit lower before I can get some charging going.

Full time cycling every day best to stay in the top 40% with periodic extended charges to get back to 100%.


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Lwiddis

Mono Basin National Forest Scenic Area

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Posted: 06/13/20 01:37pm Link  |  Quote  |  Print  |  Notify Moderator

“Trick is getting them back 100% tip top charged...” Yes, and an adequate solar system with a good controller does that for me most days.

brianosaur

Long Island

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Posted: 06/13/20 04:12pm Link  |  Quote  |  Print  |  Notify Moderator

So not going under 12.1v is a a safe bet for now I guess?

We prob do 10 nights w/o shore power, and 20-25 with it, each season.
If I get over 30 nights - with my weekend warrior work schedule - I am golden.
Might go to Costco and get some 6v's after we get back next week.

The link gobb posted shows this chart:
[image]

wa8yxm

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Posted: 06/13/20 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

One of the reasons I so like GC-2 Golf Car batteries is they are DEEP CYCLE (note I used all caps) Recommended maximum depth of discharge is 50%

Now MARINE/deep cycle (notice how the Deep cycle went lower case) should be run down not more than about 25%. some say 20..

Also DEEP CYCLE do a better job of recovering from an "OH @#[email protected]#" discharge.


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brianosaur

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Posted: 06/13/20 06:17pm Link  |  Quote  |  Print  |  Notify Moderator

Yeah, I am prob going to run this dealer battery low and not really care. Give it an early death and have a good reason to go get 2GC's again.

ktmrfs

Portland, Oregon

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Posted: 06/14/20 10:08pm Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

One of the reasons I so like GC-2 Golf Car batteries is they are DEEP CYCLE (note I used all caps) Recommended maximum depth of discharge is 50%

Now MARINE/deep cycle (notice how the Deep cycle went lower case) should be run down not more than about 25%. some say 20..

Also DEEP CYCLE do a better job of recovering from an "OH @#[email protected]#" discharge.


Trojan lists cycle life vs. depth of discharge. For most RV users, 6V GC2 cycle life at even 75% DOD is higher than many will experience in a decade. IIRC cycle life is over 500 cycles at 75% DOD. 50% DOD yields 1,000 ish cycles.

Now, even Trojan true deep discharge 12V have a much lower life. about 500 cycles at 50% DOD


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