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3 tons

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Posted: 06/09/20 08:05pm Link  |  Quote  |  Print  |  Notify Moderator

Well my Best ‘informed via real world experience’ guess is that there’s far less of a voltage sag issue when using the LiFePo4’s than with either shore or genny power, meaning easier on motor windings...JMO

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Itinerant1

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Posted: 06/10/20 08:41am Link  |  Quote  |  Print  |  Notify Moderator

It certainly would appear that way that the lfp compared to Pianotuna batteries can handle it. I think Pianotuna said his battery bank was in the 900ah range (maybe I'm confusing that) compared to my 500ah.




Freep

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Posted: 06/10/20 11:11am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:


Unfortunately I need -40. There is at least one LI chemistry that can do that--but nothing in a large format jar. Lithium titanate



Do you really need -40? Do you have no water in your rig, only ice?


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pianotuna

Regina, SK, Canada

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Posted: 06/10/20 11:16am Link  |  Quote  |  Print  |  Notify Moderator

Itinerant1,

What a WONDERFUL report. ty so much.

My bank was originally 875 amp-hours of Marine jars. This was chosen because I knew I wanted to run the block heater for 3 hours during temperatures in the -30 to -40 range.

Four years ago I moved to used telecom batteries--556 amp-hours. The Marines were 11 years old and I simply got tired of laying down in the snow to check electrolyte levels.

My solar does, best case, about 17 amps @ 12 volts (nominal). I'm sure the voltage sag on LI is not as great, but equally your solar farm is much larger than mine.

My air conditioner doesn't stumble--but the red light on the Magnum remote does raise its ugly head on the air conditioner starting from scratch when on the generator (eco on), or on just the inverter.

One interesting side bit of information. If the battery bank is depleted, with load support on, and input amps limited to 12 (on a 15 amp shore power connection), then that "limit" will be overridden, and the shore power breaker at the pedestal will trip if you exceed the rating on the breaker.

That happened when I was having the RV cleaned. My cleaner has me park the RV in front of her home. It was winter and I was running electric heaters. She plugged in the vacuum, and that was enough to cause the trip. Her husband reacted quite badly. You would have thought I had caused a whole subdivision to loose power.


Regards, Don
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.

pianotuna

Regina, SK, Canada

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Posted: 06/10/20 11:30am Link  |  Quote  |  Print  |  Notify Moderator

Freep wrote:

pianotuna wrote:


Unfortunately I need -40. There is at least one LI chemistry that can do that--but nothing in a large format jar. Lithium titanate



Do you really need -40? Do you have no water in your rig, only ice?


-40 will kill Li batteries. I've boondocked at -37 c (-34 f). That temperature will also kill Li.

I've since found a battery chemistry called SiO2 which shares many of the attributes of Li. The differences that I'm aware of at weight (greater than a similar capacity lead acid) and the ability to be used and charged at -40. Some of the shared items are no sulphation, and zero maintenance. That means no more needing to get to 100% state of charge.

The SiO2 is about 1/2 the price of Li. It can "do" 900 amps for 5 seconds from a 100 amp jar, which I think is better than Li.

Cycle life is 2800 if you don't go below 50% soc, and 1500 if you go down to 20% soc.

Best of all, the SiO2 are sold in Canada. $600 ($450 usd) for 100 amp-hours. This is a competitive price with AGM.

01tundra

Middle, TN

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Posted: 06/11/20 08:06am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Freep wrote:

pianotuna wrote:


Unfortunately I need -40. There is at least one LI chemistry that can do that--but nothing in a large format jar. Lithium titanate



Do you really need -40? Do you have no water in your rig, only ice?


-40 will kill Li batteries. I've boondocked at -37 c (-34 f). That temperature will also kill Li.

I've since found a battery chemistry called SiO2 which shares many of the attributes of Li. The differences that I'm aware of at weight (greater than a similar capacity lead acid) and the ability to be used and charged at -40. Some of the shared items are no sulphation, and zero maintenance. That means no more needing to get to 100% state of charge.

The SiO2 is about 1/2 the price of Li. It can "do" 900 amps for 5 seconds from a 100 amp jar, which I think is better than Li.

Cycle life is 2800 if you don't go below 50% soc, and 1500 if you go down to 20% soc.

Best of all, the SiO2 are sold in Canada. $600 ($450 usd) for 100 amp-hours. This is a competitive price with AGM.


Mount the batteries inside the trailer?


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pianotuna

Regina, SK, Canada

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Posted: 08/14/20 12:57am Link  |  Quote  |  Print  |  Notify Moderator

Here is some more information on SiO2 jars

"Shari from Azimuth to answer your questions... The ones above are manufactured in China by a Canadian company, Soneil Electronics. Soneil has been around since 1994, but they made smaller size light traction SiO2 batteries for the healthcare and materials handling industries. It wasn't until a few years ago that they expanded into larger size deep cycle solar. RV, telecom and marine sizes. They haven't been that great at marketing so they are a best kept secret. Lead crystal / SiO2 batteries are currently being made by Betta Batteries(Australia), Green Rhino (Germany) and Soneil Electronics (Canada). I have attached some studies of lead crystal / SiO2 batteries for review. [emoticon] So far, all the ones in the field are exceeding our expectations."

video https://youtu.be/ZFnjIodpI30

discharge to one volt https://youtu.be/O45eLd5YotM

* This post was edited 08/14/20 01:09am by pianotuna *

pianotuna

Regina, SK, Canada

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Posted: 08/14/20 11:14am Link  |  Quote  |  Print  |  Notify Moderator

01tundra wrote:

pianotuna wrote:

Freep wrote:

pianotuna wrote:


Unfortunately I need -40. There is at least one LI chemistry that can do that--but nothing in a large format jar. Lithium titanate



Do you really need -40? Do you have no water in your rig, only ice?


-40 will kill Li batteries. I've boondocked at -37 c (-34 f). That temperature will also kill Li.

I've since found a battery chemistry called SiO2 which shares many of the attributes of Li. The differences that I'm aware of at weight (greater than a similar capacity lead acid) and the ability to be used and charged at -40. Some of the shared items are no sulphation, and zero maintenance. That means no more needing to get to 100% state of charge.

The SiO2 is about 1/2 the price of Li. It can "do" 900 amps for 5 seconds from a 100 amp jar, which I think is better than Li.

Cycle life is 2800 if you don't go below 50% soc, and 1500 if you go down to 20% soc.

Best of all, the SiO2 are sold in Canada. $600 ($450 usd) for 100 amp-hours. This is a competitive price with AGM.


Mount the batteries inside the trailer?


That won't help save LI when the RV is in storage.

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