Pl8 mk gel profile

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Pl8 mk gel profile

Postby ICEUK » 06 Apr 2019, 09:49

I have these batteries fitted https://www.yuasa.co.uk/rec80-12.html
what do i need to change in the mk gel pl8 profile to chargd these correctly? Thx in advance.
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Re: Pl8 mk gel profile

Postby Burgerman » 06 Apr 2019, 10:40

Set termination to same 1000thC - in this case 80mA, (IF IT NEVER REACHES THIS INCREASE TO AROUND 100mA) set 8 hour CV limit which it may or may not hit, which is fine, set CV charge volts to 14.40v / 28.80V which is 2.40Vpc. Make sure that trickle is off. Set 25A if charging via Anderson. Or 12A if via XLR. Press go.

Their figures:
Cyclic (or Boost) charge Voltage at 20°C (V)/Block 14.52 (±3%) SO 14.4 is safe, and OK when the batts are at 25C in summer and warmer than your room after use.
Cyclic (or Boost) charge Voltage at 20°C (V)/Cell 2.42 (±3%)
Cyclic Chg voltage tmp correction factor from std
20°C (mV)
-4

Charge Current
Cyclic (or Boost) charge current limit (A) 20 25 is safe, the limit is in case of a large block of batteries.

Maximum Discharge Current
1 second (A) 480 (thats terrible. The odyssey is 5000 Amps! And 1500 amps for 5 seconds!)
1 minute (A) 310 (thats just as terrible!)
Cyclic Life Data
100% DOD down to 80% capacity 300
75% DOD down to 80% capacity 500 (thats about 400 at 80% so worse than MK and Odyssey.)
50% DOD down to 80% capacity 600
25% DOD down to 80% capacity 1400

Impedance
Measured at 1 kHz (mΩ) 4.7 And this is why it cant deliver any power and charge rate is limited... Odyssey is 2.5mOhm so twice as good, MK 3.5mOhm so much better. These will have high voltage sag/drop under even moderate load which is why they are cheap.
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Re: Pl8 mk gel profile

Postby ICEUK » 06 Apr 2019, 22:51

Thx bm for info. I know they are cheap but the chair is a backup so not really necessary to have the best batteries.
ICEUK
 
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Location: UK

Re: Pl8 mk gel profile

Postby Burgerman » 07 Apr 2019, 08:24

Fair enough. With fully charged battery it will drive as if its already 50% discharged. And get worse as you drive.
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