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Develop ultra capacitor power supply and LiFePO4 battery power supply
Develop ultra capacitor power supply and LiFePO4 battery power supply
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Old 23rd May 2019, 06:58 PM   #601
Heathkit is offline Heathkit  United States
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Photos of my MkII board...
The first one shows the display right after it auto-shuts off, after it running 10 seconds. All batteries measure the same voltage before and after.

Just to try something, I will remove the jumpers and install the last 2 battery holders and batteries, since I just received the remainder of my order.
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Old 23rd May 2019, 07:35 PM   #602
Greg Stewart is offline Greg Stewart  United States
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Develop ultra capacitor power supply and LiFePO4 battery power supply
@Heathkit,

Maybe you did and I missed it, but can you measure and post the voltages of each cell during the time when it is on before it clicks back off? I know it will take a few times to do this, but that is what I am most interested in.

Thanks!

Greg in Mississippi
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Old 23rd May 2019, 08:04 PM   #603
simon dart is offline simon dart  United Kingdom
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@Heathkit. I had a problem with a bad cell (brand new!) which caused the board to show some similar behaviour. Check all the large 0.015 ohm current sense resistors on the bottom of the board close to the relays have not gone open circuit. If the cell is hogging tons of current they blow to protect the board and you get that warning before shut down. The bad battery voltage looked OK when initially measured paradoxically.
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Old 24th May 2019, 02:48 AM   #604
Greg Stewart is offline Greg Stewart  United States
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Develop ultra capacitor power supply and LiFePO4 battery power supply
@simon dart,

THANKS for that post. That is exactly the type of issue I was hoping we'd spot with each cell's on-status voltage. BUT @Heathkit can also now look at those .015R's.

Curious what you'll find, @Heathkit.

Greg in Mississippi
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Old 24th May 2019, 07:47 PM   #605
Heathkit is offline Heathkit  United States
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Default Problem solved!

Thank you Greg and Simon for your suggestions, it helped track down what was going on.

It didn't make sense because the batteries all measured fine with it OFF, but when running, 2 cells measured 0 vdc. So that immediately told me either a faulty battery or holder. I tried swapping positions of those two cells and the zero volts situation moved with the suspect cells, so now I'm wondering how 2 out of 10 brand new cells could be bad?

Further testing with the unit running showed when putting the test leads on the holder terminals there was 0 vdc, BUT when you moved the leads in a bit and contacted the battery itself, then it was reading 3.3 vdc. What the heck!

It turns out 2 of my batteries were not making contact on the negative terminal in the holder due to the plastic center being slightly raised above the negative contact surface. See photo attached. These 2 cells were carefully corrected with an xacto knife.
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Old 24th May 2019, 11:49 PM   #606
Greg Stewart is offline Greg Stewart  United States
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@Heathkit,

Great to hear. Glad you got it going.

Greg in Mississippi
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Old 31st May 2019, 12:12 AM   #607
casshan is offline casshan  Hong Kong
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Could anyone tell me what is this message mean? I just finish the board assembly last night and plug 12v power to the board. The charging start a few seconds but change to “pending”.
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Old 31st May 2019, 01:21 AM   #608
sfleming is offline sfleming  United States
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that means it's ready to go, Casshan.
Push the nob down for a couple of seconds to fire it up.

-Steve
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Old 31st May 2019, 01:47 AM   #609
casshan is offline casshan  Hong Kong
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Quote:
Originally Posted by sfleming View Post
that means it's ready to go, Casshan.
Push the nob down for a couple of seconds to fire it up.

-Steve
Hi Steve, thanks a lot!
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Old 1st June 2019, 10:42 AM   #610
paoloilpizzo is offline paoloilpizzo  Italy
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Which is the standard duration of the battery ?
I'm using the lifePO4 to power a raspberry 3B+ (with the 5Vouput) the fifoPi and the DAC Es30982qm (with the two 3.3 outputs) and the Standard I/V board with the other two output connected to have +13.2V 0 -13.2V
So I'm using all 10 batteries.
But after 90 min the LifePO start to recharge the batteries.
Is it normal?
May I have to wait some cycle charge discharge to have a longer period available?
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