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Sterling1
Garden Valley
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Joined: 09/21/2013
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StirCrazy wrote:
so, the plot thickens everything I find says 50% or higher and if you're not using them for a long time recharge every 3 to 6 months. I think this is another area where older chemistry myths might be carrying over
Yea, different manufacturers have different recommendations. I just wonder how much difference it makes in the real world.
For someone that really cycles the batteries a lot and is concerned about maximizing the cycle life it may make sense to take extra effort to store them in optimum conditions.
For someone like me who doesn't put a lot of cycles on the batteries storage conditions may not make much of a difference (as long as they aren't stored in a discharged state). They are more likely to die from old age than anything else.
It would just be nice to see how much of an impact storage SoC has on LiFePO4 battery life.
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StirCrazy
Kamloops, BC, Canada
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Joined: 07/16/2003
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Sterling1 wrote:StirCrazy wrote:
so, the plot thickens everything I find says 50% or higher and if you're not using them for a long time recharge every 3 to 6 months. I think this is another area where older chemistry myths might be carrying over
Yea, different manufacturers have different recommendations. I just wonder how much difference it makes in the real world.
For someone that really cycles the batteries a lot and is concerned about maximizing the cycle life it may make sense to take extra effort to store them in optimum conditions.
For someone like me who doesn't put a lot of cycles on the batteries storage conditions may not make much of a difference (as long as they aren't stored in a discharged state). They are more likely to die from old age than anything else.
It would just be nice to see how much of an impact storage SoC has on LiFePO4 battery life.
I try not to go by the manufactures but rather from the makers of the cells. What people call manufacturers in this area are really just assemblers. they don't make anything themselves; they just assemble off the shelf components. They may have custom cases made for them, or they might make custom solutions to hold everything together so there is a small possibility they might make a tiny part...
So, I tend to look at CATL, BYD, ELB and EVE cell manufactures, of which, the first three are the biggest in the game, and while EVE isn't as big they are known to be one of the highest quality cells on the market.
2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100
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DWeikert
York, PA
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A little late to the thread but just throwing this out there. Instead of 2 100ah batteries is there a chance you would have the space for one 200ah battery? For example -
JITA 12V 200Ah Plus LiFePO4 Battery
Wiring is much easier and solves the problem of trying to balance the cells across 2 different batteries.
My $0.02
Dan
Dan
2008 Chevy D/A 2500HD ECSB
2010 Northstar 8.5 Adventurer
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WarrenS65
SoCal
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I have 2 206Ah SOK batteries, a Victron SmartShunt, and a Victron Multiplus 3000 inverter/charger. The two batteries are connected in parallel with the negative going to the SmartShunt and the positive going to a battery disconnect switch.
The other side of the shunt and switch are connected to my bus bars with the MultiPlus, Victron Orion DC/DC converter (2 of these), Victron MPPT controller, and the 12V wiring going to the camper.
The SOK batteries have BMS with Bluetooth. I was having "trouble" with the SOC on the two batteries and the Victron all being different. I called CurrentConnected.com (where I bought the batteries and most of the other Victron components), and they had me disconnect one battery then discharge it and recharge it twice, then repeat with the other battery. After this, I reconnected both batteries and everything is working well.
My advice is to buy all your components from one source that will give you good support.
I also have the Victron Cerbo GX and it's connected to my router. I get e-mail alerts when the batteries cross thresholds I've set, but with the solar panels, I haven't had to plug it in since March.
2022 F450
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Sterling1
Garden Valley
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DWeikert wrote:A little late to the thread but just throwing this out there. Instead of 2 100ah batteries is there a chance you would have the space for one 200ah battery? For example -
JITA 12V 200Ah Plus LiFePO4 Battery
Wiring is much easier and solves the problem of trying to balance the cells across 2 different batteries.
My $0.02
Dan
The battery would probably fit but I've already got the batteries. I could just put a jump wire across the positive terminals (like I have on the negative terminals) if I wanted to bypass the positions on the switch (there would be no difference between A/B/Both from an operational standpoint) to alleviate any balancing concerns. But I do like the ability to isolate the batteries from each other if I want.
Thanks
* This post was
edited 05/02/23 06:21pm by Sterling1 *
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3 tons
NV.
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Follow-up to WarrenS65:
When it comes to accurate SOC’s, I kinda see the Bluetooth feature mostly as marketing gimmickry, while their real utility is for checking individual cell status…Further, it remains to be seen how the Bluetooth will respond to two batteries in parallel or series connection…My view is there’s no substitute for the credibility of a Victron shunt based meter..
Of all possible features, the Bluetooth feature wouldn’t be high on my ‘must have’ list - JMO
3 tons
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3 tons
NV.
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3 tons wrote:Follow-up to WarrenS65:
When it comes to accurate SOC’s, I kinda see the Bluetooth feature mostly as marketing gimmickry, while their real utility is for checking individual cell status…Further, it remains to be seen how the Bluetooth will respond to two batteries in parallel or series connection…My view is there’s no substitute for the credibility of a Victron shunt based meter..
Of all possible features, the Bluetooth feature wouldn’t be high on my ‘must have’ list - JMO
3 tons
Upon edit, the aforementioned Bluetooth SOC inaccuracy may be associated with personal charging practices, and the number of less than a FULL charge, charge cycles which overtime leads to cumulative meter drift, whereas the Victron could be FAR better at resolving cumulative drift…Just MO…
3 tons
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mbloof
Beaverton, OR
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3 tons wrote:3 tons wrote:Follow-up to WarrenS65:
When it comes to accurate SOC’s, I kinda see the Bluetooth feature mostly as marketing gimmickry, while their real utility is for checking individual cell status…Further, it remains to be seen how the Bluetooth will respond to two batteries in parallel or series connection…My view is there’s no substitute for the credibility of a Victron shunt based meter..
Of all possible features, the Bluetooth feature wouldn’t be high on my ‘must have’ list - JMO
3 tons
Upon edit, the aforementioned Bluetooth SOC inaccuracy may be associated with personal charging practices, and the number of less than a FULL charge, charge cycles which overtime leads to cumulative meter drift, whereas the Victron could be FAR better at resolving cumulative drift…Just MO…
3 tons
IMHO: this is where inline current shunts (Bluetooth or not) come in handy.
Fairly simple - measure AH In/Out of battery(s).
Also IMHO: anything that relies on battery voltage to calculate an implied SOC can't possibly take into account the parasitic loads our campers have in their calculation and therefore will always be an 'approximation meter' at best.
While the simple solution is to always have more AH then you need/use our truck campers have limited space to stuff more AH in. ![[emoticon]](http://www.rv.net/sharedcontent/cfb/images/smile.gif "smile")
- Mark0.
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3 tons
NV.
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Mark0 said;
“ While the simple solution is to always have more AH then you need/use our truck campers have limited space to stuff more AH in…..”
Absolutely, I couldn’t agree more - two 200a/hr beneath the dinette seats!!
3 tons
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Sterling1
Garden Valley
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For now I plan to use a volt meter I have installed in my camper for SoC level which should be good enough for my use. I've "calibrated" the camper meter with a multimeter at the batteries when the isolation switch is switched off to eliminate parasitic draw. So far there no significant difference between the camper volt meter and the multimeter but I haven't taken measurements when the batteries are in a low SoC.
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