Steca 20 amp Solar Regulator - Float Setting Question

Submitted: Friday, Oct 09, 2009 at 00:21
ThreadID: 72888 Views:5184 Replies:3 FollowUps:5
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We have a Steca 20 amp Solar Regulator. Instructions say to set regulator for Gel battery setting if you have AGM batteries (which we do). Spec’s say for Gel battery, that float charge is 14.1v. However, for “30 day maintenance charge” for Gel batteries, it lists 14.4v (for 2.00 h) as the charge.

From what I know 14.1v charge is too high– Remco (I have 100ahr batteries) say float charge should be 13.5-13.8v. Not sure what is meant by “maintenance charge”??

Got me a bit worried. I wonder if 14.1v is a typo / error. Any advice appreciated.

Cheers
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Reply By: Maîneÿ . . .- Friday, Oct 09, 2009 at 02:32

Friday, Oct 09, 2009 at 02:32
My Steca 'float charge' is ~13.6v charging AGM's (they are N0T Gel batteries)

Maîneÿ . . .
AnswerID: 386355

Reply By: Mandrake - Friday, Oct 09, 2009 at 15:18

Friday, Oct 09, 2009 at 15:18
I have a Projecta 10 Amp reg it floats between 14.4 and 13.2 v
Rgds

Mandrake
AnswerID: 386395

Reply By: dry lake racer - Saturday, Oct 10, 2009 at 13:10

Saturday, Oct 10, 2009 at 13:10
The Steca PRS series 13.9v float, boost 14.4v & the PR series - liquid 13.9v & Gel 14.1v, boost 14.4v the 30 day maintenance charge sounds like the equilisation charge (14.7v) which is designed to bubble the liquid in a flooded cell battery ( normal lead acid ) to stop any statification of the acid, this is not needed in a gel or AGM battery & will destroy the battery if used , that is why it is deactivated when you set the regulater for a gel battery, Gel & AGM batteries do not have any liquid in them
Hope this helps ,Martin
AnswerID: 386494

Follow Up By: jdwynn (Adelaide) - Sunday, Oct 11, 2009 at 09:10

Sunday, Oct 11, 2009 at 09:10
thanks Martin, that explains the Gel setting. Still wondering about the high float setting. Cheers

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FollowupID: 654130

Follow Up By: Maîneÿ . . .- Sunday, Oct 11, 2009 at 10:32

Sunday, Oct 11, 2009 at 10:32
Kym,
the PM system does not appear to be working so have to reply here:
at this point I’ve not had any hassles with my system running 2 x 100 ah AGM's (NOT Gel) they run on the lower Voltage (NOT Gel) setting, hence the ~13.6v showing when they are charged, but anything from 14.7 down on other occasions.
If your battery is to have a low voltage then the 'normal' (not gel) setting is the only choice you have.

Remember to install and uninstall the cables to the Steca in the correct order as shown in the book, this *IS* important.

If you run ALL your accessories from the Steca you can use and rely on the State Of Charge settings to be correct, however if anything is run direct from the AGM battery the SOC will be totally WRONG, so don't even look at it in this set-up configuration.
I run my fridge direct from the AGM's via a ceramic fuse, so I never look at the SOC settings as they will NEVER be correct at any time.
Yes, I could have run everything from the Steca, but it may have overloaded the 15 Amp limit of my PR1515, so I choose to be safe rather than happy to use a setting that would be handy to have as my fridge draws ~12 Amps @ start-up, runs ~8 Amps when running (runs @ 2.8 Amp Hour) would have used a different configuration with a PR2020, running through the Steca instead of direct.

Mainey . . .
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FollowupID: 654138

Follow Up By: jdwynn (Adelaide) - Sunday, Oct 11, 2009 at 11:26

Sunday, Oct 11, 2009 at 11:26
thanks again Mainey, all quite a bit to digest! I had noticed SOC not correct but hadnt really thought about it much as yet - good to know what's happening there. Can you tell me though, what's the advantage of running all of the acecssories through the Steca [at present I have everything coming direct fom battery]. Cheers

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FollowupID: 654141

Follow Up By: Maîneÿ . . .- Sunday, Oct 11, 2009 at 12:15

Sunday, Oct 11, 2009 at 12:15
The advantage is the Steca will 'monitor' the battery voltage and disconnect all accessories when the battery is @ ~11v and automatically reconnect them again @ ~12.6v, it shows the SOC of the battery system on the LCD screen so you know the battery condition.
You have to remember the Voltage (number) you see on the LCD, in sunlight, is always the battery charging Voltage and never the rested battery Voltage.
During the day (sun shining) the Solar system will power accessories and/or charge the battery, so low voltage disconnect is not relevant.
If you check my profile pics it clearly shows my battery system is never below 12v at any time, even at night with fridge, lights and stereo etc running simultaneously, this is the big advantage of larger battery capacity, but may not be feasible with 1 x 100ah battery.
Using a larger capacity battery system you get much longer running times and much better battery life as you will use a smaller amperage % from each battery and won’t discharge either of them anywhere near as low as in a single battery system.

Maîneÿ . . .

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FollowupID: 654144

Follow Up By: jdwynn (Adelaide) - Sunday, Oct 11, 2009 at 13:45

Sunday, Oct 11, 2009 at 13:45
thanks Mainey, should be easy to do the way I've set thing up, cheers
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FollowupID: 654157

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