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 > Change to Lithium-ion?

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pianotuna

Regina, SK, Canada

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Posted: 06/26/19 11:06pm Link  |  Quote  |  Print  |  Notify Moderator

What is missing from most converters is temperature compensation. If you camp in extreme weather (-40 to +40) then it is needed at both extremes.

Neither the WFCO nor PD converters are "up to much", but at least the PD can be set to a higher voltage.


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.

steveh27

Grosse Pointe Woods, MI

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Posted: 06/27/19 06:15am Link  |  Quote  |  Print  |  Notify Moderator

I am awaiting delivery of 200 ah of these batteries for my Class B. They come with BMS and mounting terminals.

https://www.amazon.com/3-2V100Ah-Lithiu........%2Brv%2Csporting%2C175&sr=8-1-spons&th=1

They said all my wiring and charging systems will work. I have a PD4635.

I only have room for 1 lead acid battery of 105ah. So I should have much more amps to use 80% of 200 = 160, vs 50% 0f 105= 52. They're supposed to charge faster and better so I will not be adding to my 120 watt portable solar panel. My only concern is Using it in the 1st week of December can be cold. This is their reply:
Our LiFePO4 battery working temperature is -20 to +60 Degree C for discharging, and 0 to 60 Degree C for charging, -10 to +45 Degree C for stock. And we have done testing at -20 Degree C, the result should make sure battery have 60% more capacity under this condition.

I hope my Trimetric meter will give good info on it's status.

I emailed with the factory to meet my small battery size for 200ah and they came up with a set. They had me buy through Alibaba (a first) for $1,400.

I spend at least 30 days snowbirding in FLA without hookups and some here in Michigan.

2oldman

Ca

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Posted: 06/27/19 08:27am Link  |  Quote  |  Print  |  Notify Moderator

Link doesn't work. Has a space in it.

2oldman

Ca

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Posted: 06/27/19 08:49am Link  |  Quote  |  Print  |  Notify Moderator

The most Chinese looking battery I've ever seen.

https://www.amazon.com/3-2V100Ah-Lithiu........%2Brv%2Csporting%2C175&sr=8-1-spons&th=1

* This post was edited 06/27/19 09:09am by 2oldman *

pianotuna

Regina, SK, Canada

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Posted: 06/27/19 08:52am Link  |  Quote  |  Print  |  Notify Moderator

That's getting down to similar cost as an AGM.

RCMAN46

NorthWest

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Posted: 06/27/19 09:20am Link  |  Quote  |  Print  |  Notify Moderator

I have used LiFePO4 in radio control airplanes for the radio system batteries.
The LiFePO4 is very stable very little danger of fire if the battery is mistreated.

As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.Thus very difficult to determine if the battery is near its discharged state. They only way I know of is an accurate record of the volt amps used. There are instruments that can track the volt amps used.

Here is a device I use and has a 50 amp continuous rating. On draw back it has to be de-energized to reset the readings.

DC power meter

2oldman

Ca

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Posted: 06/27/19 09:35am Link  |  Quote  |  Print  |  Notify Moderator

RCMAN46 wrote:



As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.
I'm not sure that's true of RV batteries. My 48v pack will show a voltage drop.

larkyblast

calgary

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Posted: 06/27/19 10:07am Link  |  Quote  |  Print  |  Notify Moderator

Those chinese batteries sure look interesting.

RCMAN46

NorthWest

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Posted: 06/27/19 10:14am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

RCMAN46 wrote:



As said before a major drawback is the LiFePO4 has a very flat discharge voltage curve.
I'm not sure that's true of RV batteries. My 48v pack will show a voltage drop.


What batteries are used in your 48v pack. I mean manufacture and type or part number.

MrWizard

Traveling

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Posted: 06/27/19 10:22am Link  |  Quote  |  Print  |  Notify Moderator

2oldman

How much of a voltage drop from full to 50% SOC
Then it would be 1/4 of that for a 12v drop in battery


Radiate The Happy
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Connected using Verizon and AT&T
1997 F53 Bounder 36s


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