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BFL13

Victoria, BC

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Posted: 05/23/22 03:19pm

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56.5 constant amps in Bulk is 28% charging rate--expect lower rate to run to a higher SOC before tapering but take longer over all.

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Here is the old ugly graph again showing 55 amps on a pair of FLAs rated at 220 but might have been more like 200 if they used the 1 amp instead of the 20 hr rate--don't know now. Doesn't make a lot of diff here though.

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You can see the times to do a 50-90 are longer with the FLAs because of earlier tapering. Took an hour to do the 80-90 vs 1/2to do the 80-90 with the SiO2

There is some inaccuracy due to the monitor not showing any heat loss but that seems to be not much of a factor. Anyway there it is.

* This post was edited 05/23/22 03:34pm by BFL13 *

1. 1991 Oakland 28DB Class C
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Lwiddis

Cambria, California area

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Posted: 05/23/22 04:21pm

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Interesting observations. TY for posting.

Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad

BFL13

Victoria, BC

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Posted: 05/23/22 06:03pm

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Whoever replied at 1521, it's not showing on mine yet. Apparently that means you are in Admin's bad books! [emoticon]

pianotuna

Regina, SK, Canada

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Posted: 05/23/22 06:37pm

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Ty BFL13,

Useful information.

I'd be tempted to stop at 80% myself.

Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

3 tons

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Posted: 05/23/22 09:04pm

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Lwiddis wrote:

Interesting observations. TY for posting.

X2!! Thanks BFL for the good information!

3 tons

BFL13

Victoria, BC

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Posted: 05/23/22 09:25pm

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pianotuna wrote:

Ty BFL13,

Useful information.

I'd be tempted to stop at 80% myself.

Yes 40 - 80s is 40% too and save gen time

Note this is not much use with solar No constant amps and amps taper from noon as sun lowers regardless of battery SOC

StirCrazy

Kamloops, BC, Canada

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Posted: 05/24/22 06:36am

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BFL13 wrote:

pianotuna wrote:

Ty BFL13,

Useful information.

I'd be tempted to stop at 80% myself.

Yes 40 - 80s is 40% too and save gen time

Note this is not much use with solar No constant amps and amps taper from noon as sun lowers regardless of battery SOC

Ok so I am not sure if this applies as much to SiO2, maybe some one can tell me as there is nothing showing up on a google search, but I see a lot of people only charging normal batteries to 80% all the time are you not worried about sulfication.

if you do this continuously, or even just store the battery with a partial charge, it can cause sulfating which reduces the capacity of acid batteries.

Steve

2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

BFL13

Victoria, BC

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Posted: 05/24/22 07:56am

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With FLAs doing successive incomplete recharges in a row leads to Progressive Capacity Loss. We talked about this on here about ten years ago. You must do a "recovery" to Full every so often or your capacity gets so low you can't get through the next night. Depends on the whole scenario how many days you can do it.

Solar solved that by doing shallow instead of deep cycles and by getting close to or even to Full often when the sun is out. You still have to get to Full every so often and do an overcharge per battery guidelines.

Here is a plot showing PCL with five successive 50-90s I did about ten years ago.

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