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Forum Index : Solar : Post went to Guestbook???

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ptrott

Newbie

Joined: 08/04/2008
Location: Australia
Posts: 15
Posted: 02:58pm 16 Jun 2022
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Not sure why, but my post to the Solar forum went to Guestbook?

http://www.thebackshed.com/forum/ViewTopic_mobile.php?FID=1&TID=14922#187662
Cheers,
Phill.
 
Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 8107
Posted: 12:02am 17 Jun 2022
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I will inform Gizmo.  Might be that the forums don't like you posting from a mobile phone, as it expects everything to be from a browser on a full-size computer.

I might be wrong on that, but that is what it looks like.
Smoke makes things work. When the smoke gets out, it stops!
 
Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 658
Posted: 12:12am 17 Jun 2022
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Will edit the link  http://www.thebackshed.com/forum/ViewTopic.php?FID=1&TID=14922#187662    


Removed the   _mobile

I don't have one of these Chargers, but this is part of a manual.





Hope that helps.
Cheers Aaron
Off The Grid
 
Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 4930
Posted: 12:13am 17 Jun 2022
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I'll look into it this weekend.

Glenn
The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ
 
ptrott

Newbie

Joined: 08/04/2008
Location: Australia
Posts: 15
Posted: 02:02am 17 Jun 2022
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Glenn, it was posted from a PC, not a phone or tablet if that makes a difference.
Cheers,
Phill.
 
ptrott

Newbie

Joined: 08/04/2008
Location: Australia
Posts: 15
Posted: 02:32am 17 Jun 2022
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Revlac,
I have the figures worked out, the issue for me is that I don't fully understand the terms they are using.
I am led to believe that LiFePo4 should be charged in 2 stages, first is Constant Current.
As you can see, there is no Constant Current parameter in this menu.
Second stage is Constant Voltage, which I have set to 14.2V. (Battery manufacturer states 14.6V)
Float is not desirable, but cannot be set to zero so I went for a figure that I hope will be harmless at worst.
Boost also cannot be set to zero, so I went for a short burst at the manufacturers recommended charge voltage.
Over VOltage and Under Voltage cannot be zero, so took a wild guess at those.
Under & Over Recovery Voltages I didn't even try to guess because I have no idea at all.

To put things in perspective, this is a single 135AH battery in an occasional use caravan, 4 or five weeks a year average usage. 340W @ 72V solar on the roof.

The parameters that I can set are as follows:
Constant Voltage:   (14.2)
Float Voltage:      (12.6)
Boost Voltage:      (14.6)
Boost Charge Time: (6 min)
Bat. O/voltage:         (14.7)
Bat. O/voltage recovery: (14.2?)
Bat. U/voltage:         (12.5)
Bat. U/voltage recovery: (12.5?)
Max. discharge current: 100A
Maximum charge current: 40A
Cheers,
Phill.
 
Solar Mike
Guru

Joined: 08/02/2015
Location: New Zealand
Posts: 974
Posted: 02:49am 17 Jun 2022
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I used to have the previous model of that charger made by IPanda, it was the 60A version; the settings I used on a 4 cell 12V 400 AH Lifepo4 battery below.

Unfortunately it was a heap of junk, threw it in the bin, its mppt algorithm was hopeless, it kept loosing the mppt point whenever the sun got clouded over and never recovered, without turning it off and on again, I ended up designing my own which worked much better.

Constant Voltage:   (14.0)      3.5v/cell
Float Voltage:      (13.4)      3.35/cell
Boost Voltage:      (14.0)      3.5/cell
Boost Charge Time: (1hr)        allow enough time for BMS to top balance
Bat. O/voltage:         (14.4)  3.6v/cell
Bat. O/voltage recovery: (14)
Bat. U/voltage:         (11.2)  
Bat. U/voltage recovery: (12?)
Max. discharge current: 100A
Maximum charge current: 40A


Cheers
Mike
 
ptrott

Newbie

Joined: 08/04/2008
Location: Australia
Posts: 15
Posted: 06:56am 17 Jun 2022
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Thanks Mike.
Looks like I wasn't wildly off the mark.
I hope the model I have, which is the 3rd iteration I believe, performs somewhat better. It has been great as an AGM charger over the last 12 months if that is anything to go by.
Cheers,
Phill.
 
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