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Old 05-12-2016, 09:24 AM   #1
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True deep cycle battery charging

When the "marine" battery on my 287BHSW dies, I am think about buying a TRUE deep cycle battery. Possibly a pair of Trojan T105s or just a Trojan T1275.

For people who have gone this route what do you use for battery charging both while camping and at home ?

How hard is it to disconnect the on-board charger ?
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Old 05-12-2016, 09:42 AM   #2
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I'm in the process of converting from dual purpose to deep cycle.


I'm staying with the OEM 3-stage charger until it proves unsuitable.
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Old 05-12-2016, 09:57 AM   #3
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I'm staying with the OEM 3-stage charger until it proves unsuitable.
I have never seen any documentation that the OEM charger is a 3 stage !
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Old 05-12-2016, 10:39 AM   #4
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Quote:
Originally Posted by theoldwizard1;407212....Possibly a pair of Trojan T105s or just a Trojan T1275.

[COLOR="Blue"
T105's are probably the most common choice for 6VDC batteries.[/COLOR]

For people who have gone this route what do you use for battery charging both while camping and at home ?

A lot of the members use a generator while camping. The best method for the deep cycle batteries is to plug your generator into the shore power outlet and charge the batteries using the TT's battery controller. Deep cycle batteries are not like car batteries and do not like, for a longer life, to get a rapid charge or discharge.

I use SOLAR and do not own a generator.. no issues in 4 years.


How hard is it to disconnect the on-board charger ?
The only time you need to disconnect the TT's charge controller is if you run your inverter (should you get one) back through the TT's 110VAC electrical system. IT is not difficult, the AC power lead that goes to the battery controller just needs to be moved to its own breaker. About a 5 minute job.

Below is a chart on how the Battery charge controller (that came with our TT) operates. My TT's battery charge controller has been off since I installed SOLAR.

Hope this helps

Don
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BATTERY - ELECTRICAL - PD4000 Battery Charging Stats.jpg  
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Old 05-12-2016, 10:59 AM   #5
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I have never seen any documentation that the OEM charger is a 3 stage !
Mine is. And I have measured the voltage at the battery at each stage to prove to myself that it is working properly. The only downside is that the battery and the converter are far apart, and the long wire run costs a little voltage. I have been told repeatedly not to worry about it because my level of voltage drop is "insignificant".

I plan to put 2-12V true deep cycles on my trailer before Fall of this year, and I have no intention of replacing my OEM converter/charger.
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Old 05-12-2016, 11:47 AM   #6
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I plan to put 2-12V true deep cycles on my trailer before Fall of this year, and I have no intention of replacing my OEM converter/charger.
So why two 12V batteries instead of two 6V (plain golf cart or Trojan T-105) ?
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Old 05-12-2016, 01:03 PM   #7
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So why two 12V batteries instead of two 6V (plain golf cart or Trojan T-105) ?
That hasn't been fully decided yet. A while back when I was looking into it, the 2x12V fit my needs better and was a little bit cheaper. Also, if for some reason one of my 12V pukes, I can still run, and I REALLY like the insurance of redundancy in my systems. In a 2x6V system, if one goes, you're SOL. Not that I think one battery in a bank would be likely to die alone, but I don't think it's outside the realm of possibility.

2x6V is still not out of the question though. I will revisit the decision as the time to make it comes closer.

As it is, I'm limping along on the Interstate Dual Purpose my dealer provided (and then discharged completely when I had the trailer in for repairs, so it won't take a full charge any more), but I'm almost always plugged in, so it's okay for now.
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Old 05-12-2016, 01:39 PM   #8
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2x6V is still not out of the question though. I will revisit the decision as the time to make it comes closer.
Maybe not the absolute "best" deep cycle battery, but Costco now stocks Interstate 6V golf cart batteries. IIRC, they are <$90 each !

NOCO make a battery box that hold two 6V batteries.
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Old 05-12-2016, 01:58 PM   #9
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Originally Posted by theoldwizard1 View Post
So why two 12V batteries instead of two 6V (plain golf cart or Trojan T-105) ?
I got talked into a single 12V deep cycle solution by the guy selling both types:
  • Each 6V was 80% the cost and 60% the weight and bulk of the 12V
  • The single Ah capacity of the 12V was 96% of the 6V.
So, for 60% less cost, 40% less weight, one less battery box and no additional jumper, I get over 95% of the performance.

It's a compromise I can live with!
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Old 05-12-2016, 02:04 PM   #10
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If you are not ready for a "dual battery" solution, but you want a "true" deep cycle, check into a Trojan T-1275. It is a true deep cycle, 12V, Group 31 sized, "golf cart" battery. You will have to shop around for these and they are not cheap ! (Actually more expensive than 2 Interstate GC-1 from Costco.)

You will probably have to buy a new battery box because most TTs come with either a Group 24 or Group 27 sized box.
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