Gel battery monitoring??

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Re: Gel battery monitoring??

Postby gpigeon » Mon Jun 05, 2017 8:01 am

Helipos wrote:........ Hope you did your research.


I did so much research that it nearly did my head in! So many conflicting views re equipment and methodology!!! It is still going on now, even after the system is installed and up & running....sort of! In the end you have to make a decision and live with the consequences.

The sales guy said to me in an email prior to me placing the order "sometimes you have to take the leap in faith"! I replied, yes I know that but I hope it is not a leap into darkness!
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Re: Gel battery monitoring??

Postby Helipos » Mon Jun 05, 2017 10:50 am

LeighC wrote:What is the best impedance meter to buy please?
Thanks - Leigh


I don't know it's necessarily the best but it does what we need for work.
It would be the Hioki model/s that preceded this one.
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Re: Gel battery monitoring??

Postby gpigeon » Wed Jul 05, 2017 6:06 am

Sort of following on from the "monitoring" question.......
If early in the morning the battery is say 75% charged, is it better for the long term health of the battery to:
1. carry on using power prior to sunrise, thus draining the battery even more, or
2. wait a couple of hours until the batteries are fully charged and then do the washing, vacuuming, etc.
or isn't it even worth worrying about?
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Re: Gel battery monitoring??

Postby davidg » Wed Jul 05, 2017 6:56 am

gpigeon wrote:2. wait a couple of hours until the batteries are fully charged and then do the washing, vacuuming, etc.

This one ..........................!
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Re: Gel battery monitoring??

Postby davidg » Wed Jul 05, 2017 7:03 am

Helipos wrote:I don't know it's necessarily the best but it does what we need for work.
It would be the Hioki model/s that preceded this one.

Great unit, unfortunately it's also got a hefty price :( at about $3k it's out the range of most users for a single battery system.

#just saying
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Re: Gel battery monitoring??

Postby SandyP » Wed Jul 05, 2017 8:46 am

gpigeon wrote:Sort of following on from the "monitoring" question.......
If early in the morning the battery is say 75% charged, is it better for the long term health of the battery to:
1. carry on using power prior to sunrise, thus draining the battery even more, or
2. wait a couple of hours until the batteries are fully charged and then do the washing, vacuuming, etc.
or isn't it even worth worrying about?


It will be best to wait until there is enough power being produced directly from your solar panels to cover the proposed loads. This may be before or after your batteries are fully charged.

Based on battery manufacturers graphs of the cycle life of a battery it appears there is a "fixed" amount of amps that can be put into/taken out of a battery over its lifetime (be that a smaller number of deep discharges or a larger number of shallow discharges).
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Re: Gel battery monitoring??

Postby Helipos » Wed Jul 05, 2017 10:25 pm

davidg wrote:Great unit, unfortunately it's also got a hefty price :( at about $3k it's out the range of most users for a single battery system.


Spread across 150 odd battery systems it's much more palatable.
To be fair most home users can achieve a good enough guess at battery condition of a gel cell with voltage readings and a high rate discharge.
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Re: Gel battery monitoring??

Postby gpigeon » Wed Mar 28, 2018 5:34 am

Have we got any other owners of Energystore 2RPG Gel batteries out there?

My system has been up and running for about 8 mths now and the deepest disch. has been this morning (111Ah out of 1410Ah total = 92% SOC). It is only 0626 now so that will increase until sunrise....but more rain predicted. So generally I am quite happy with the system.

There appears to be some controversy over whether or not to "boost" and/or "equalise" charge these gel batteries.
Exide, the battery suppliers say to equalise....the inverter suppliers (Schneider) and many others on the web say not to apply these charges to gel batteries.
Who is right?

So, if we have any other Energystore owners there....
1.what do you do with regards to boosting and equalising?
2.how old are your batteries?
3. how often do you monitor voltages across each cell?
4. have you noticed any drop off in performance?
5. If so, what was it you noticed?
Thanks.
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Re: Gel battery monitoring??

Postby Gordon-Loomberah » Wed Mar 28, 2018 7:50 am

gpigeon wrote:Exide, the battery suppliers say to equalise....the inverter suppliers (Schneider) and many others on the web say not to apply these charges to gel batteries.
Who is right?


You would have to go with the battery manufacturer on that, but being gel, I would think that the EQ voltage will be relatively low cf flooded cells, probably just above the absorb charge voltage (or equal to it, for a longer duration), and you would only want to do it on rare occasions, when cell voltage differences are noticed, not on a regular basis.
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Re: Gel battery monitoring??

Postby jules » Wed Mar 28, 2018 10:35 am

gpigeon, you measured the voltage of your batteries about 8 months ago when you installed them. Have there been any significant changes for better or for worse?

On boosting and equalizing ... to some extent what they involve depends on the settings of your regulator.
The regulator I'm using, for example, holds the [usually daily] max. boost voltage for 2 minutes once the battery voltage gets there and then eases off to float. This is quite battery friendly so long as the boost max is moderate and you can set it yourself

With equalizing, you probably have options as to voltage, duration and intervals between equalizations [if that's a word].

The "controversy" isn't all that meaningful in real terms so long so long as you use moderate voltage and duration for boost and perhaps even more so for equalize.

I use a set of VRLA batteries that have similar constraints on both boost and equalize voltage to your gel cells but while there's a slight variation between cells at the second decimal point, they've changed very little over 4 years and moderate equalizations make next to no impression on changing the long term operating voltage of any given cell.
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Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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