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msmith1199

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Posted: 09/05/20 06:57pm Link  |  Quote  |  Print  |  Notify Moderator

Just downsized from a Class A DP to a Class B+. I got the residential fridge in the new motorhome so power when off the grid is going to be more of an issue that it was before. I’ve been looking at Lithium batteries and they look like a good solution for me. Only problem I see is physical size. The two current batteries I have are 11.5 inches long and they are a tight fit in the battery compartment. All the lithium batteries I’ve seen are at least 12.5” or longer. So they won’t fit in the existing battery compartment without modifications. But those are all 100AH batteries. I see they also have 200AH lithium batteries. They are a lot longer, over 20 inches, but one of those batteries will fit in the compartment versus two 200AH batteries. So not only does the 200AH battery have a smaller footprint than two 100AH batteries, they are also quite a bit cheaper than buying two 100Ah batteries.

Anybody see any issues in going with one 200ah battery versus two 100ah batteries?


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Lwiddis

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Posted: 09/05/20 07:14pm Link  |  Quote  |  Print  |  Notify Moderator

The issue IMO isn’t the type of battery but the recharging of whatever batteries you get. With an adequate solar system recharging most days isn’t an issue.


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time2roll

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Posted: 09/05/20 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

Only reason to go 200 would be the 300 does not fit. I believe it is best to have a single unit when possible with lithium. Although if you have a large inverter you may need multiple to have sufficient continuous amp rating.

Foe dimensions: (shop around)
https://www.lithiumion-batteries.com/pro........teries/12v-300ah-lithium-ion-battery.php


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Ed_Gee

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Posted: 09/05/20 07:39pm Link  |  Quote  |  Print  |  Notify Moderator

Msmith 1199, Sounds good to me ..... don't forget to address the battery charger situation if needs be....


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msmith1199

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Posted: 09/05/20 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

Ed_Gee wrote:

Msmith 1199, Sounds good to me ..... don't forget to address the battery charger situation if needs be....


I haven’t figured out which converter I have yet. I went to the motorhome today and looked for it and couldn’t find it. Apparently it’s under the bed. So I’ll go back tomorrow and look there and get the specs off it and see if it will work with a big lithium battery.

msmith1199

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Posted: 09/05/20 07:57pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Only reason to go 200 would be the 300 does not fit. I believe it is best to have a single unit when possible with lithium. Although if you have a large inverter you may need multiple to have sufficient continuous amp rating.

Foe dimensions: (shop around)
https://www.lithiumion-batteries.com/pro........teries/12v-300ah-lithium-ion-battery.php


Based on the dimensions, I think that would fit, but I don’t want to spend three grand on a battery. The 200ah are in the 12 to 1400 range. I think that will do what I need. I just need to something to keep the fridge running for the day if we’re away from the motorhome. If I’m there I can run the generator.

corvettekent

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Posted: 09/05/20 08:31pm Link  |  Quote  |  Print  |  Notify Moderator

Since you are up grading the batteries you should think about installing 400 watts of solar.


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pianotuna

Regina, SK, Canada

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Posted: 09/05/20 08:31pm Link  |  Quote  |  Print  |  Notify Moderator

Consider SiO2 chemistry--1/2 the price. I'm not sure of the dimensions.

https://azimuthsolarproducts.com/product-category/batteries/ull/


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My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

gemsworld

Arizona West Coast

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Posted: 09/05/20 08:47pm Link  |  Quote  |  Print  |  Notify Moderator

When you say residential style fridge, are you saying you have a compressor-type fridge or a true residential fridge? They both use a compressor but that's where the similarities end. Our Winnebago Navion came with a compressor-style fridge and 200 watts of solar from factory and we haven't had any problems overnighting without power or having to run the genny.





msmith1199

Reno, NV

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Posted: 09/05/20 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

Beats me. I’m not a refrigeration guy either. It’s a whirlpool electric fridge.

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