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Old 06-07-2018, 09:12 PM   #1
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Deep cycle?

Given many have switched all their interior (maybe even exterior) lighting to LED vs the old incandescent bulbs (higher wattage). Is there a real need for running (2) 6 volt deep cycle batteries vs (1) good 12v deep cycle battery?

I've switched all my interior lighting as well as the porch to LED and cut the wattage use massively. It's amazing how much cooler these LED run vs the old style bulbs. At min they use 85% less electricity per bulb.

I know appliances such as the Microwave, TV, fridge etc don't make normal use of the batteries with exception of the igniter lighter for hot water heater and/or fridge. But once those are appliances are lit the electronic end is moot.
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Old 06-07-2018, 09:19 PM   #2
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Quote:
Originally Posted by udidwht View Post
Given many have switched all their interior (maybe even exterior) lighting to LED vs the old incandescent bulbs (higher wattage). Is there a real need for running (2) 6 volt deep cycle batteries vs (1) good 12v deep cycle battery?
I think it all depends on how you're using your RV and how you're using electricity. Boondocking for 2 weeks? You'll probably want a bigger battery set.

Plugged in most of the time? Visiting commercial and private campgrounds? Just going out for a day or two and don't mind running the genset? You might be just fine with a single 12V.

In our case, we go out for 3 to 4 week trips about every other month. I work from the road and we can go a week or two between opportunities to plug in. We're upgrading to 600 Ah of lithium and will follow that with about 1200 W of solar later this year. For us and our electrical needs, a single 12V would be extremely under equipped. :-)
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Old 06-07-2018, 09:21 PM   #3
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I would keep it with a larger capacity, even with your upgrades. If weight/space is a concern, and budget is not, upgrade to lithium.

"You don't know what you got till it's gone".
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Old 06-07-2018, 09:29 PM   #4
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We have a USBattery 155 amp 12 volt scrubber battery. It weighs 83 lbs and is a true deep cycle battery and has served us well for 2 years now. The most I've pulled out of it in 24 hours is about 70 amps with the furnace and vent fans accounting for most of that. We also don't skimp on charging tablets and phones via the USB outlets. So it works for us, but in all fairness it is kind of a beast to lift on and off the tongue and it was most of a full camping season to break the thing in so it would take a charge like a normal battery. It is a good in-between the more typical 12 volt and 2 6s.
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Old 06-07-2018, 09:32 PM   #5
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The more AH capacity you have, the less % of capacity you discharge from them.

A deep cycle battery will give about 1000, 50% discharges in its life. If you only discharge them 25%, the amount of discharges, or cycles, goes up to over 1500. They last longer but your buying two batteries when they are shot.

If you replace them with a single hybrid Marine/RV start/deep cycle battery, you will only get about 700 50% cycles.

If you replace them with a true 12 volt, deep cycle battery, it will probable cost the same as 2, 6 volt deep cycle batteries. 6 volt batteries are popular in electric Golf Cars so the price is lower.

If you never dry camp, stick the smallest, cheapest 12 volt battery you can find in there. Since its always charging, it doesn't matter.
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Old 06-07-2018, 10:10 PM   #6
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The more AH capacity you have, the less % of capacity you discharge from them.

A deep cycle battery will give about 1000, 50% discharges in its life. If you only discharge them 25%, the amount of discharges, or cycles, goes up to over 1500. They last longer but your buying two batteries when they are shot.

If you replace them with a single hybrid Marine/RV start/deep cycle battery, you will only get about 700 50% cycles.

If you replace them with a true 12 volt, deep cycle battery, it will probable cost the same as 2, 6 volt deep cycle batteries. 6 volt batteries are popular in electric Golf Cars so the price is lower.

If you never dry camp, stick the smallest, cheapest 12 volt battery you can find in there. Since its always charging, it doesn't matter.
Rarely ever dry camp. Certainly not for any lengthy time. I can't imagine there is much of a load at any given time since I swapped all the old lighting out for LED's. I don't make use of either fan in my coach (1 roof vent fan & stove overhead fan).

I currently have (2) 6volt Les Schwab deep cycle batteries that were purchased in 2008. I thinking given my demand I don't have the need for (2) 6volt batteries and could save space, weight and some cash by going to just (1) decent 12v deep cycle such as USBattery 155 amp 12 volt scrubber battery.
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Old 06-07-2018, 10:31 PM   #7
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How would this work as a replacement for the (2) batteries.

https://www.summitracing.com/parts/LPP-L545
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Old 06-08-2018, 05:04 AM   #8
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How would this work as a replacement for the (2) batteries.

https://www.summitracing.com/parts/LPP-L545
If you read the notes on that battery, you will see that its not what you want. It has 7 AH of capacity. That's 7 amps for 1 hour. You could have a dead battery during a dinner break.

A cheap, gp24 marine battery has at least 50 AH.
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Old 06-08-2018, 08:46 AM   #9
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How would this work as a replacement for the (2) batteries.

https://www.summitracing.com/parts/LPP-L545
Look at Trojan T-1275 12V Deep Cycle battery.
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Old 06-08-2018, 09:06 PM   #10
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If you read the notes on that battery, you will see that its not what you want. It has 7 AH of capacity. That's 7 amps for 1 hour. You could have a dead battery during a dinner break.

A cheap, gp24 marine battery has at least 50 AH.
Missed that. No go for that battery.
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Old 06-08-2018, 09:17 PM   #11
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Two words: furnace blower. Nothing in the rig eats 12vdc like the furnace blower, 'cept the wet bay heater. My wet bay heater is 12vdc but it can only realistically be used with a supply of power from the converter, it is so power hungry.
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Old 06-09-2018, 05:17 AM   #12
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How would this work as a replacement for the (2) batteries.

https://www.summitracing.com/parts/LPP-L545
$529.99 will buy a lot amp hours from low cost 6 or 12 VDC batteries.
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Old 06-09-2018, 08:49 AM   #13
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6v versus 12v is not a factor - you should buy the amount of amp-hours needed to carry you between re-charging opportunity. A pair of 6v GC2 batteries provides 210-225 AH. You can't get that much in any reasonable size single 12v battery, but you can get about 125-130 AH (Group 31 size 12v deep cycle). If all you ever do is drive from one electric hook-up to another, that's probably plenty of AH.


A pair of GC2 6v batteries is usually a highly cost effective way to get 210-225 AH of battery power. Good quality 12v deep cycles are a specialty product and are usually priced higher than the more common golf car 6v batteries.
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