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Old 03-13-2021, 02:24 PM   #71
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Too bad they dont include $ on their very nice website?
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There is a company that makes true deep cycle lead acid flooded 8d batteries. They are a small family owned company, vs a large corporation, in the Seattle area. They manufacture two different 8D batteries, a Starting battery and a Deep Cycle. Different number of plates per cell and different plate thickness.

Dyno Battery - Premium Quality Battery Manufacturing - Made in the USA
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Old 03-14-2021, 09:55 AM   #72
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Help me understand.....two 6-volt bats have "roughly" the same amp/hrs as the 8D. If 600 or 800 amp/hrs is your target [seems many newer coaches fall in that range], I kind of get it that 2 or 3 8D's are simpler [more bats more cables] to install than 6 or 8 six-volt bats. Not withstanding the weight of a single 8D--almost a two person job to handle them--are there any performance or longevity advantages to an 8D bat?
PS--this is not a "Why not L-ion bats?" question...that is a whole different discussion.
For the house batteries in my Magna, it came with 2 8D's. Eric Olstrom made some some slight modifications to the sliding tray and I can fit six golf cart batteries or actually L16 in there. More amp hours than 2 8D lifelines. The flooded golf carts are okay but I would go with agms the next time. Flooded GC batteries take much longer to charge than agms. What you save in battery cost you pay for in diesel or solar time.
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Old 03-14-2021, 10:39 AM   #73
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For the house batteries in my Magna, it came with 2 8D's. Eric Olstrom made some some slight modifications to the sliding tray and I can fit six golf cart batteries or actually L16 in there. More amp hours than 2 8D lifelines. The flooded golf carts are okay but I would go with agms the next time. Flooded GC batteries take much longer to charge than agms. What you save in battery cost you pay for in diesel or solar time.
Yes, you can charge AGMs at higher rates but do you have the charging equipment to do it ?

You have over 1000 AHs of capacity. You need a 250 amp charger to get to 25% of capacity, to fast charge AGMs.
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Old 03-14-2021, 01:41 PM   #74
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A pair of 6V GCs will give you roughly the same AH as your 8D. Sams Club Duracell are a decent batty at an attractive price - about $85 ea for FLA and 2X that for AGM. Monthly watering and eventual corrosion of the batty tray are the biggest negatives of FLA but they have been around a long time and are a bargain.
Check your inverter/ charger settings as charger likely set for AGMs and should be changed for FLA.
Don, Thanks for your advice. I misspoke when I stated that I have "8D AGMS" ( I have been studying batteries for 2 days:-). I meant to state they are 8D Flooded. After reading your note and researching this for 2 days, I did go by Sam's Club this afternoon and purchased four Duracell GC2's.

Questions: Is any adcustment required for charging these vs. 8D's?
I am using 2 Guage Cable custom fit to decrease resistance.

Thanks in advance.
Jack
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Old 03-14-2021, 03:27 PM   #75
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Don, Thanks for your advice. I misspoke when I stated that I have "8D AGMS" ( I have been studying batteries for 2 days:-). I meant to state they are 8D Flooded. After reading your note and researching this for 2 days, I did go by Sam's Club this afternoon and purchased four Duracell GC2's.

Questions: Is any adcustment required for charging these vs. 8D's?
I am using 2 Guage Cable custom fit to decrease resistance.

Thanks in advance.
Jack
Jack
If both are FLA no change in charging necessary assuming charging was set for FLA.
If the new GCs are AGM then yes best to set charger to correct profile. Check your inverter/charger manual for procedure or post make / model and others can assist.
I have a Magnum inverter/charger MS 2812 with the remote and can assist if yours is similar.
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Old 03-14-2021, 04:51 PM   #76
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Hello,

I need to replace my two 8D AGM House Batteries. I am an engineer and may be over-researching this.

Some say replace the 8D's AGMS with 6V golf cart AGM's, flooded batteries, etc.

As mentioned previously we currently have two 8D AGMs 245AH. I would prefer flooded if possible, however leary to change without someone who has experience with flooded house batteries. I had a 40' Bertram with two flooded 8D batteries and experienced zero problems and they lasted for years.

Here is some info on our use:

1.) We rarely boondock
2.) We are hooked to shore power 90% when camoping
3.) We have an Onan 8.5KW Genset
4.) Maintenance on flooded batteies is not an issue with me. I wouold rather not use AGMs or Lithiums
5.) I do not want to modify the battery tray to fit batteries.

Would appreciate any input from those who have replaced 8D's with something else and the best place to purchase the batteries?

Jack C
2001 Coountry Coach Magna
40' w/Tag
8.5 KW Onan Genset
Located in McKinney (Dallas) Texas

Hi Jack,

Nothing wrong with changing your AGM's our for Wet Cells - though I admit, most go the other way!!

If you don't want to bother changing cabling around to get lighter per unit weight batteries, then going with 8D Wet Cells from (In no particular order.) Crown, Trojan, Rolls would be my recommendation. Sure, you can find less expensive wet cells, but I never recommend anything but what I feel are the best built options when it comes to batteries.

Frankly, with your usage, the suggestions for the Walmart of Sams Club Duracell is an economical way to go. And also frankly, though not a true deep cycle battery, a Marine 8D battery would probably support your limited house battery duty needs well too.

But I'll also share an opinion. "Stuf' happens from time to time, where we need to be off of shore power for unexpected reasons. Having a bit better quality house batteries, can really make a difference at such times. Plus, still on the opinion front. I'm in the school of thought that I'd rather pay a bit more money now, to get a few years more life out of batteries - just to avoid having to locate and swap out the battery bank again!! (Those 8D's are heavy suckers!)

If you don't mind investing in two jumper cables, then going to X's 2 Grp 31's for each 8D as replacements - is another way to go. Much easier lifting in/out Grp 31's then 8D's!

You're in Florida, so I don't have any recommendations for local battery places in that area. Factor in shipping, if ordering in from the internet.

Me? I'd go with the wet cells that I had outstanding service with - Trojan's... They'll probably be on the upper end of the price spectrum for wet cells. But they've an earned reputation for good quality and longer lasting...

As an engineer, consider/research the viability of adding a dash of Mineral Oil to reduce water loss... (Like many things with RV'ing - differing opinions on the viability of doing so! I had a Bounder that had no slide and very limited access to service the two house batteries. I wanted more AH's for contingency and added safety. And could height wise slide in X's 2 T-125's, vs T-105's. Due to the PITA factor of checking and topping off fluid levels, I did put a dash of Mineral Oil in, and it allowed me to go quite a bit longer between waterings... Doubt I hurt the batteries. When I sold the Bounder, that pair was just turning 7 years old, and the new owner replaced them 3 years later. Not because they were complete gone yet, but because he felt he was pushing his luck with 10yrs old batteries.

And if you're not real concerned with budget, and do not want AGM's. Also check out the Trojan T-1275's. You'd need X's 2 to replace Each 8D. But they're 12V, and would give you 600AH's of house bank for added contingency - for 'if' 'STUF' happens!

No right or wrong, just choices of where and how to spend your money!

Best of luck to you,
Smitty
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