Your battery recommendations? - Page 2 - Fiberglass RV


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Old 07-09-2015, 12:06 AM   #15
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That all sounds like wise advice. Too bad there's not more agreement! I do think I better keep it in the hundred-buck range, since I'm not a frequent camper and I just had to spend $600 on tires and bearings. I'll go out tomorrow and try to find a reasonably priced true, non-Marine deep cell. FYI, I'm sworn never to buy from Wallyworld...
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Old 07-09-2015, 12:26 AM   #16
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Quote:
Originally Posted by John McMillin View Post
That all sounds like wise advice. Too bad there's not more agreement! I do think I better keep it in the hundred-buck range, since I'm not a frequent camper and I just had to spend $600 on tires and bearings. I'll go out tomorrow and try to find a reasonably priced true, non-Marine deep cell. FYI, I'm sworn never to buy from Wallyworld...
John. I'm a long term camper, 90+ days at time plus several 14 to 20 day trips a year. Also I'm never on the grid, meaning I never plug in to electricity while camping. Short trips and/or plugged in most of the time I would simply get the cheapest Marine battery I could find.
During my working years when I didn't have the time to camp like I do now I used a marine battery it worked just fine for about a total of 7 years. Two years of heavy camping I needed a new battery and went with a true deep cycle battery.
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Old 07-09-2015, 01:01 AM   #17
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Originally Posted by Carol H View Post
Costco Group 27 Deep Cell has been going strong for 5 years now with lots of time spent camping off the grid. Use a simple solar system that works well at keeping it full.
I see no batteries listed at Costco's website. Do they still have them in stores?
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Old 07-09-2015, 11:22 AM   #18
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Ok Byron...you've got my interest up since you're an "Electrical" guy. When you say "50%". What voltage would that be down to? In the model airplane world, nicads I always tested. If I was testing a 4-pack (4.8v), I would pull them to apx 4.4v or 1.1v per cell for an as-per-factory test rating.

Back to deep cells. I have a chart that says that a 12v battery is FULLY discharged at 10.5V. I felt like my battery was/is going. I have a 12v 8-bulb arrangement I use to use to fully discharge my 7.4v Racing batteries. These bulbs as I tested pulls 2A ea. So the entire bar would pull 16A. I had my Scamp battery on a Battery Minder Maintenance charger for 2 weeks. I pull the charger, hook my Volt meter to the battery then the wires from the bulbs and start the discharge and monitor it. I was amazed when the battery went 4-5 min shy of 3 HOURS before hitting the 10.5v mark. Of course, I immediately remove the bulbs and begin the recharge with the Battery Minder. I'm not worried about hurting this old battery.

The charger/discharger I used on the nicads is digital and I can actually pull a load on the batteries and it will record the ah. Once it reaches the designated low voltage, it will shut off. I can pull a max 3A. I'd like to test it with it. Because as I stated, it seems the "AH"'s ratings on batteries are all OVER the place and I would actually like to test my batteries and SEE what they will do. (Would be good to test new and watch its progress over the years out of curiosity). From experience on nicads, you'll get more AH from a lower amp draw. (Keeps down heat)

Anyway, theoretically, IF my battery drained at 16a per hour and at 3 hours, that would be 48A capacity. The "RC" labeled on my Northern Scamp battery is 140. Here's an except from Mark Polk defining RC or Reserve Capacity:
***
Reserve Capacity rating (RC) is the number of minutes at 80 degrees F that the battery can deliver 25 amps until it drops below 10.5 volts. To figure the amp hour rating you can multiply the RC rating by 60 percent. RC X 60 percent
***
That calculates to 84A on my existing Scamp battery. I show it has apx 48A. So, again, it looks like I'm running nearly HALF capacity now?? Yep... 5 1/2 yrs on my Scamp.

Good stuff...hope this wasnt too boring.

Quote:
Originally Posted by Byron Kinnaman View Post
92 AH @ ! amp. WOW... Most batteries are rated at XX AH @ 20 Amp.

Useable is 1/2 or 50% of rated capacity. That would mean your 92 AH @ 1 Amp is good for 46 hours.

Marine batteries are hybrids. Somewhere between a cranking/starting battery and a deep cycle battery.
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Old 07-09-2015, 11:40 AM   #19
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The best bang for the buck available here in Denver seems to be a DEKA Deep Cycle Marine battery, 750 CCA, for $105 (or $130 at another RV store). Sears' comparable $100 battery has 33% less capacity, and their AGMs cost twice as much. No big sales out there- I'm noticing how few stores sell batteries anymore.
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Old 07-09-2015, 12:03 PM   #20
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The best bang for the buck available here in Denver seems to be a DEKA Deep Cycle Marine battery, 750 CCA, for $105 (or $130 at another RV store). Sears' comparable $100 battery has 33% less capacity, and their AGMs cost twice as much. No big sales out there- I'm noticing how few stores sell batteries anymore.
The safety requirements around products that contain acid are making it difficult for retailers. Rubber aprons, rubber gloves, eye wash stations etc. as well as employee training are required in many areas. I know someone who worked for a big box store that had all the safety equipment but the funny thing here is that no employee ever used any of it. Try holding a group 27 battery with heavy black rubber gloves. Most likely you'll drop it. It amazes me that we see acid batteries on the shelf in a big box store where customers have self service access.
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Old 07-09-2015, 12:53 PM   #21
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Your battery recommendations?

I'm with those who recommend a group 29 deep cycle. Deka, Trojan and Interstate have the best industry rep.

Remember though that your charge controller has a lot to do with it as well. Many of the chargers in fiberglass trailers don't have sufficient charge voltage for high end batteries and/or they don't have desulfation capabilities.

Even a cheap battery lasts much longer with a quality charger.


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Old 07-09-2015, 02:47 PM   #22
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The Walmart Ever Start MAXX with the 2 year full replacement warranty (about $97) is a maintenance-free battery and dispite the label is not a true deep cell battery. The battery (also ever start) that has the one year battery replacement warranty and cells that you can add fluid to is the deep cell battery (about $87 or less depending on size)......confused yet ????

I was told the sealed maintenance-free so called deep cell battery was made for marine electric trolling motors and not a good idea in an RV application. The choice is yours.
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Old 07-09-2015, 02:55 PM   #23
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***
EDIT 4:15PM : Just spoke with EverStart 1-888-387-8278. They said your statement was not true regardless where it came from. Both batteries are used for both marine and RV. And the Maxx-24DC IS a "deep cycle" battery and carries a 2yr Warranty because it is the better battery. Here's a rating not posted on the battery: The MAXX has an RRC 85 vs RRC 65 (Repetitive Reserve Capacity) on the 24DC. My choice is to stick with the MAXX. Confused?
***

You were "told" this... I'm not doubting what you say...but would just like to know the source. If it's a "review" online somewhere, I'd like to read it.

On the OTHER hand, no more than I "boondock", I could use a motorcycle battery". Mine is used mostly for when I go to my Scamp for some reason and just flip a light on to see. But I'd rather go back with what I have.

Quote:
Originally Posted by Uplander View Post
The Walmart Ever Start MAXX with the 2 year full replacement warranty (about $97) is a maintenance-free battery and dispite the label is not a true deep cell battery. The battery (also ever start) that has the one year battery replacement warranty and cells that you can add fluid to is the deep cell battery (about $87 or less depending on size)......confused yet ????

I was told the sealed maintenance-free so called deep cell battery was made for marine electric trolling motors and not a good idea in an RV application. The choice is yours.
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Old 07-09-2015, 04:10 PM   #24
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YDarryl T. About three months ago I did a lot of on line research when my RV battery died and would not take a charge. Exactly where any of the information I learned came from I can not remember right now. If you google RV deep cycle batteries and/or AGM deep cycle batteries you will discover a lot of interesting websites with perhaps more information than you will ever need. Prior to that on line research I did not even know AGM Batteries even existed, let alone what they were! If you do this you also will discover a lot of information on the different types of battery chargers and "maintainers" (again perhaps more info than you need).

The one thing I did learn is that going from a group 24 deep cycle battery to a group 27 or a group 29 battery is indeed a good thing if you like to RV Boondock Style.
Somewhere along the line I discovered that maintenance free deep cycle are made for marine use and not the best choice for RV applications....better to add distilled water to the old standard deep cycle types when they need it. If you do your own search there is no end to what you will discover. If you only camp at campgrounds with electric and water hook-ups then just buy the cheapest group 24 deep cycle battery Walmart sells and you will be good to go! Good luck and happy camping!
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Old 07-09-2015, 04:20 PM   #25
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Uplander... you made mention and I think this has been mentioned in earlier posts as well, but "Maintainer/chargers" are one of the keys for longevity if ANY 12v battery goes without usage in my opinion. Earlier this year, I purchased a Battery Minder. This week, I got in my order with 3 Battery Tender JR's. I got a good deal on them from Amazon. $23 ea delivered to my door. Our Wally World sells them for $34.95 + tax ea right now! I have a vehicle that's driven very little... a riding mower not driven at all in the winter, and a 12v SLA for my model plane tool box....and of course the Scamp They'll be used.
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Old 07-10-2015, 10:10 AM   #26
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True the two most important factors in deep cycle battery life are...maintaining proper fluid levels (check monthly).... And keeping the battery at full charge by using the right charger/maintainer....the "smart charging" systems found in better designed travel trailers do a fantastic job...they sense the need to recharge then drop back the charge current once the battery is at full charge and maintain the charge level as required....a lot more to it than most folks realize. For winter storage Walmart sells the type of "smart chargers" that do the job right....beware some battery chargers can destroy deep cycle batteries by over-charging.
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Old 07-10-2015, 12:17 PM   #27
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Me, I prefer the Walmart 3 year full replacement warranty. If it go bad, I just take it in to the nearest Walmart along with the receipt and get a new one. For the remaining out years 4 and 5, they prorate the exchange.
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Old 07-10-2015, 12:20 PM   #28
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Do you buy the extended warranty?

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Originally Posted by Darwin Maring View Post
Me, I prefer the Walmart 3 year full replacement warranty. If it go bad, I just take it in to the nearest Walmart along with the receipt and get a new one. For the remaining out years 4 and 5, they prorate the exchange.
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