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Old 10-20-2017, 07:48 PM   #1
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Two 6 volt batt or Two 12 volt batt

So my dealer installed one 12 volt battery and it is not enough for my 2017 NP 381 DLQS. It has the res fridge and a 1000watt inverter. After traveling 6+ hours the DW told me the inverter was flashing at 11.8 volts. Discussing this at the campfire, I was told to go with two 6 volt batteries. I told him I do not boondock and his response was I bet your first truck wasn't a diesel either. Help please...
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Old 10-20-2017, 07:58 PM   #2
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While an identical battery will help your situation, it is very likely your existing battery is a "dual-purpose" battery, not a true deep-cycle battery. A true deep-cycle battery (most often 6-volts in RV situations) has much thicker lead plates and better tolerates discharge/recharge cycles. I have never seen a 12-volt battery ever installed from the factory/dealer that are "real" deep-cycle batteries.

There are a number of owners frequently on JOF who are far more versed in battery technology, hopefully they will weigh in and give you some good information to consider.
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Old 10-20-2017, 08:40 PM   #3
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We don't boondock either, but I have three (3) 12 volt batteries (not the one that the dealer installed) to power the res fridge while traveling in our NP 377. Haven't had a problem since.
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Old 10-20-2017, 09:28 PM   #4
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Bookemdano: If running three 12s are they all the same? I've heard 12 volts are not true deep cycles.
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Old 10-20-2017, 09:47 PM   #5
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I'm running 4 Trojan six volt batteries, but we mostly dry camp. Everyone we've talked into going to six volts will never go back, like I said above though we all dry camp mostly.
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Old 10-20-2017, 09:52 PM   #6
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Two six volt batteries have more storage than two 12 volt. I would go with the 6 volt.

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Old 10-21-2017, 05:12 AM   #7
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Most 12 volt "deep cycle marine/rv" batteries are not truly DEEP cycle batteries, they are a hybrid between a deep cycle and a starting battery. If the battery has a CCA (cold cranking amps) rating it IS NOT really a deep cycle battery. Instead look for AMP/HOUR ratings.
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The deep cycle marine/rv batteries will work well in most peoples application - limited boondocking. However, if you plan to boondock much, you should consider true deep cycle batteries. I believe virtually all 6 volt batteries are true deep cycle batteries.
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Regarding 12 volt or 6 volt.... Assuming both have the same amp/hour ratings .... both will give you exactly the same storage capacity. Where the difference between 12 and 6 comes into play is the internal resistance and the connection resistance of each battery. These will never be exactly the same for both batteries resulting in one battery getting a higher charge (or discharge) than the other so you end up with one 'working harder" than the other.
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With two 6 volt batteries ALL the charge (or discharge) current passes through BOTH batteries and is equal resulting in both "working" equally.
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Old 10-21-2017, 06:14 AM   #8
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Most RV buyers are unaware of what the issue is when they purchase the RESIDENTIAL fridge with all its space inside, and find that their batteries and TV can not keep up with the battery drain caused by the fridge. I attached a link to another post here that we dig into the problem (45Amp drain) and the fix that is working perfectly. The fridge type was a Frigidaire, but the same issue and fix can be done to any residential fridge.

Bare minimum, I personally would go with the TRUE deep cycle 6 volt batteries, will need 4 to ensure enough power, based on the findings.

Best solution, 4 true deep cycle batteries and 500 watts of SOLAR power with MPPT SOLAR Charge controller (will add about 40 Amps, with sun). This will cover your travels and keep the batteries topped off. This fix is a "MUST" for anyone that dry-camps or spends a night between CG's. I have 2 Trojan T-145 6 volt batteries (260Ah), and for 5 years they are working GREAT!

Adding the modification would be your best bet. Contact Klassic (member) for more information on his install.

For more Residential Fridge info you can search "Residential Fridge" using the above search.

https://www.jaycoowners.com/forums/f...mod-47511.html

Good luck,

Don

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Old 10-21-2017, 08:25 AM   #9
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Quote:
Originally Posted by DonaandDon View Post
Bookemdano: If running three 12s are they all the same? I've heard 12 volts are not true deep cycles.


Sorry just now seeing your question. No, they are not "true" deep cycle...you'll need the 6 volt batteries if that's what your looking for. All 3 of mine are the same 12 volt. They are the blue top Optima's.


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Old 10-21-2017, 09:03 AM   #10
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Great information as always and thanks. Better to have and not need than to need and not have. 6 volt batteries it is.
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