Please Help Me

[CarWin]

Im wanting to get rid of my flooded batteries in my coach! I have a 2018 3701LK model and it has 2 Interstate group 27 batteries( I think) in it now, but I want to go with AGM batteries. We very rarely camp without shore power, unless just a quick overnight stop when traveling from point A to B. What amp hours and brand is best for my situation? Thanks for any and all help in advance!

[TCmontana]

You might want to search for this topic, as there have been many post about batteries. Just a suggestion. I would search "Battery Replacement"

Hope this helps

[CarWin]

Originally Posted by TCmontana

You might want to search for this topic, as there have been many post about batteries. Just a suggestion. I would search "Battery Replacement"

Hope this helps

I have done such and the info is overwhelming and confusing to me. I don't quite understand the different sizings and amp hours to get the best bang for my dollar.

[AZ Traveler]

Darwin,

Your questions are not that simple and you are asking us to guess on your requirements. What do you want to power for how long without shore power? Are there genny or solar considerations? What is most important to you, cost or capability?

Your first task is completing an energy budget. What do you want to power, how much power does each item use and how long do you want to run it?

[CarWin]

Originally Posted by AZ Traveler

Darwin,

Your questions are not that simple and you are asking us to guess on your requirements. What do you want to power for how long without shore power? Are there genny or solar considerations? What is most important to you, cost or capability?

Your first task is completing an energy budget. What do you want to power, how much power does each item use and how long do you want to run it?

Im only wanting to run our residential fridge for a solid day or more without issue, if we so choose. We have no generator or solar to consider.

Im torn between going AGM(2) or 6V(4) batteries to give us sufficient and ample power if we chose to use it and or need it. Capability is the biggest concern, since we know Im not going Lithium, the most expensive.

[rames14]

Just a suggestion. For a little over $100, you can install a VictronConnect battery monitoring system. It will work regardless of type of battery (lithium, AGM, lead acid). And, you will find out how much you are using as far as amps. The other thing I found out is I usually was dropping voltage before I got to 50% discharge. (4) golf cart batteries will give you empirically about 200 - 250 amps of usable based on results from my 2015 3160 with (4) golf cart batteries. Hope this helps.

[Vet4jdc]

Originally Posted by CarWin

Im wanting to get rid of my flooded batteries in my coach! I have a 2018 3701LK model and it has 2 Interstate group 27 batteries( I think) in it now, but I want to go with AGM batteries. We very rarely camp without shore power, unless just a quick overnight stop when traveling from point A to B. What amp hours and brand is best for my situation? Thanks for any and all help in advance!

Given what you describe here, don't overthink it. Just go buy two Interstate deep cycle 12 volt batteries and replace. They will hold up nicely for you without going to a big expense. That's my advice!

[jcurtis934]

You want to get rid of flooded, but not pay for lithium iron phosphate...so agm is your only choice. You have two group 27, so you can upgrade to group 31 agm and add a total of three to gain more amphr capacity. You can also switch to 6 volt agm batteries and will need at least four. The goal is to not go below 50% on your battery bank or you shorten their life span. You will have to do some testing with your present 2 batteries and see how many hours you can run that fridge before reaching the 50% level of battery charge. Group 27 should be around 75 amphr capacity, group 31 around 100 amphr. 50% charge level will be about 12.25 vdc. How long can you run that fridge off grid before reaching 12.2 vdc? And try to make sure you run the test using any other draw like lights, water heater, etc.

[mlh]

Originally Posted by CarWin

Im only wanting to run our residential fridge for a solid day or more without issue, if we so choose. We have no generator or solar to consider.

Im torn between going AGM(2) or 6V(4) batteries to give us sufficient and ample power if we chose to use it and or need it. Capability is the biggest concern, since we know Im not going Lithium, the most expensive.

If all you want to do is run your refrigerator for a day or so go down to Harbor Freight and get a 2000 watt inverter generator. They are about $550. Your don’t need anything fancy. It’s simple, cheap and it will do what you need. Two batteries will cost almost as much.
Lynwood

[Razahoryin]

Originally Posted by jcurtis934

You want to get rid of flooded, but not pay for lithium iron phosphate...so agm is your only choice. You have two group 27, so you can upgrade to group 31 agm and add a total of three to gain more amphr capacity. You can also switch to 6 volt agm batteries and will need at least four. The goal is to not go below 50% on your battery bank or you shorten their life span. You will have to do some testing with your present 2 batteries and see how many hours you can run that fridge before reaching the 50% level of battery charge. Group 27 should be around 75 amphr capacity, group 31 around 100 amphr. 50% charge level will be about 12.25 vdc. How long can you run that fridge off grid before reaching 12.2 vdc? And try to make sure you run the test using any other draw like lights, water heater, etc.

So I installed lifeline AGM’s
4-6volt
They are not cheap but my last set lasted 8 yrs
I could not be happier and I primarily dry camp
The lifelines GPL-6CT are the same base/case size but taller
Specifications

Volts 6
Length In (mm) 10.28 (261.1)
Width In (mm) 7.06 (179.3)
Height In (mm) 13.02 (330.8)
Weight LB (kg) 90 (40.8)
Cold Cranking Amps
68F 1150
32F 1025
0F 925
Rated Cap. Amps Hours @ 20hr Rate 300
Minutes of Discharge
25 Amps 692
15 Amps 1200
8 Amps 2205

[bcrvman]

Originally Posted by CarWin

Im only wanting to run our residential fridge for a solid day or more without issue, if we so choose. We have no generator or solar to consider.

Im torn between going AGM(2) or 6V(4) batteries to give us sufficient and ample power if we chose to use it and or need it. Capability is the biggest concern, since we know Im not going Lithium, the most expensive.

First thing to do is get a battery monitor, Victron or Bogart.
I have a residential and went Lithium plus solar.
If you measure your fridge with a kil-a-watt meter it will likely show you use 1250 Wh per day. That means you need 104AH per day. At 50% max use that means 208AH of LeadAcid Battery or 100AH of Lithium. Real deep discharge batteries are usually 6V so I would recommend 4 6V Trojan T105's but get the battery monitor installed first. Remember, you will need to plug into shore power every 24 hours to recharge the batteries and that will take most of a day. Lithium recharge super fast, just one of the many benefits.

[AZ Traveler]

Originally Posted by Razahoryin

So I installed lifeline AGM’s
4-6volt
They are not cheap but my last set lasted 8 yrs
I could not be happier and I primarily dry camp
The lifelines GPL-6CT are the same base/case size but taller
Specifications

Volts 6
Length In (mm) 10.28 (261.1)
Width In (mm) 7.06 (179.3)
Height In (mm) 13.02 (330.8)
Weight LB (kg) 90 (40.8)
Cold Cranking Amps
68F 1150
32F 1025
0F 925
Rated Cap. Amps Hours @ 20hr Rate 300
Minutes of Discharge
25 Amps 692
15 Amps 1200
8 Amps 2205

Ron,

Sounds like a very capable battery bank.