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Open Roads Forum  >  Tech Issues

 > Got my new (used) batteries!! Now, how do I rejuvenate them?

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Naio

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Posted: 06/27/17 10:24pm Link  |  Quote  |  Print  |  Notify Moderator

>When discharged, the charging amperage the battery accepts, how long t accepts it before voltage rises to 14.7ish

Doesn't this depend on where I set the MW???

It's been taking the battieries an hour or 2 to unsag...I guess. It's hard to stay bec the voltage never stays constant for long, but it get so it changes more slowly. And then it's completely different when I move the clips to another battery


3/4 timing in a DIY van conversion. Backroads, mountains, boondocking, sometimes big cities for a change of pace.


pianotuna

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Posted: 06/27/17 10:45pm Link  |  Quote  |  Print  |  Notify Moderator

Using an inverter to do the draw down may tend to increase amps as the voltage on the jar drops. The inverter does its level best to keep the voltage up on the output side.

I would put a kill-a-watt meter between the inverter and the load so you can monitor watts, amps, output voltage and total watts used.


Regards, Don
Full Time in 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.

landyacht318

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Posted: 06/27/17 11:20pm Link  |  Quote  |  Print  |  Notify Moderator

Do Kill a watts work properly On the output of Inverter?

Even if they do, they will not account for the inverter losses or line losses from ther battery.

Get the battery to 14.7ish, twist pot to hold it at 14.7ish when charging.

Not being familiar with the Megawatt, I can only relate that with my meanwell rsp-500-15. I only have to account for voltage drop difference on my wiring at 40 amps, compared to 0.4 amps. I only bother to turn mine higher loaded or unloaded when i want 40 amps to last for longer while battery is climbing to 14.7v. If time is not an issue and max amps for max duration is not an issue, then if I set my Meanwell unloaded to 14.7, it will get to 14.7v by the time amps taper to the single digits. Somewhat slower to just set it to 14.7v and let it go, compared to setting it to 15.3v to hold 40 amps until battery terminals getto 14.7v( accounting for voltage drop, but no constant pot fiddlement is required.

For the load test, Amp draw at beginning of test, just before ending test, the duration of the test, and voltage readings at those endmarks can reveal enough info for us to make edu mun cated guesses as to the health of each battery you test. The same load and the same duration test will allow
valid comparisons between batteries.

How many KWH or AH actually pass out of the battery can be inferred close enough from the amperage at the beginning of test, and the end of the test, and how long the test was performed, minimizing all variables.

Meaning do not start test, stop test, goto bed for 8 hours and then restart test as that will reveal nothing helpful.

Throw a 4 to 8 am pload on each battery individually for a set period of time, record initial battery voltage unloaded, then loaded, record amperage, then after X amount of time, record amperage flowing record voltage at battery terminals, then remove load, record voltage at 30 seconds, 5 minutes then and hour then 5 hours.

Seek to perform the same test on subsequent batteries keeping all variables as close as possible, and then there IS a basis for comparison, not only from battery to battery, but then again on the same battery if one is going to rechrge it again and load test it again, and compare the voltages/ results to the previous test.

Measure and time the load, return the battery to full charge recording the charging amps and duration and voltage, then load it again.

Do this a few times and it removes nearly ALL the mystery of how a battery stores and releases the energy it has the ability to contain.

Do this a few times and you can look back on this thread in a year and wonder how it was not so obvious to you then.

Ammeter, voltmeter, load and a clock. You have those tools and the sources.

If your battery is not going to accept much more than 25 amps, this tool will record Amp hours and watt hours, upto 64AH with about 90% accuracy.

Sorry no direct link, copy and paste:

https://www.amazon.com/GT-Power-Analyzer-Consumption-Performance/dp/B00C1BZSYO

I feel all ~ 25 amp charging sources should have one.

I modify mine with 8awg and push 40 amps thorough it without concern and it is almost shockingly revealing as to what the battery is accepting/has accepted from the charging source. not 100% accurate by any means but a zillion times better than 'it has held 12.92v for a week now, is it good?'

pianotuna

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Posted: 06/28/17 09:35am Link  |  Quote  |  Print  |  Notify Moderator

Hi Landyacht,

Kill-a-Watt works correctly with a pure sine wave inverter.

But even with a MSW the numbers could be used to compare one jar to another. The losses remain the same so they do not invalidate the testing.

MEXICOWANDERER

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Posted: 06/28/17 10:39am Link  |  Quote  |  Print  |  Notify Moderator

This is sort of like strapping various weights to the back of a chicken, then flogging the chicken to see how fast it can run...the slower it runs the heavier the weight. If the chicken topples it's heavy. Runs and minutes of RUN TIME with a NEARLY CONSTANT amp hour draw reveals intelligent usable information. Quantifiable.


[image]


Satco S5013 - 100 Watt - A21
12 Volt - Frost - 1,500 Life Hours - 980 Lumens

https://www.1000bulbs.com/product/54321/SATCO-S5013.html

[image]

Naio

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Posted: 07/06/17 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

Well I haven't done any testing yet, busy, with the 4th, etc. Today I am back to it. Decided to charge battery #4, not charged yet, before anything.

Updates:
All have been sitting for a week or so.
A 12.80
B 12.78
C 13.02
D 12.34

I think battery D could easily take too many amps and smoke my mw, so I am changing based on amps, not volts.

Started it out with initial surge of 29 amps, quickly settled without me adjusting mw to 18 amps. That's at about 13.68v.

I figure I'll let it sit here and check it every few, for an hour in case of unsagging. Unless y'all tell me otherwise.

MEXICOWANDERER

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Posted: 07/06/17 12:39pm Link  |  Quote  |  Print  |  Notify Moderator

[image]

Naio

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Posted: 07/06/17 12:39pm Link  |  Quote  |  Print  |  Notify Moderator

I am, btw, not too happy with battery A,and B, and wondering if I can do anything else for them.

Naio

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Posted: 07/06/17 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

Volts going up, amps going down. About 14a 12,73v, I goosed it up to 16a, 13.87v.

Edit: maybe that was 13.73. all thumbs.

Another edit:
It got itself up to 13.9v. I goosed it again to 14.5v and 16a, will see how that sits, see if I can get closer to 14.7 in a few. So suspenseful!

Hmmm.. 5mins later it has gone up to 14.55 so I guess I better leave it.

* This post was last edited 07/06/17 01:45pm by Naio *   View edit history

Naio

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Posted: 07/06/17 01:03pm Link  |  Quote  |  Print  |  Notify Moderator

Lol, what the heck is that pic? Rainbow smiley faces? Easter eggs? I'll take it as something positive [emoticon]

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