My Classic 150 only charges in Float MPPT mode? No Absorb No Bulk

Started by critterdog, July 15, 2022, 05:55:24 PM

Previous topic - Next topic

critterdog

I don't know if I have something set wrong but the title says it all pretty much. My classic 150 no longer shows bulk charging or absorb charging. EQ is disabled because I have AGM 4 in series to get 48v. I only get Float MPPT charging.
I have not worried about it too much because it charges my batteries fine and it does go into float at my voltage set point.

I want to switch to Lithium. Expensive upgrade so now this bugs me. Do I have something set wrong?

Thanks in advance

Charge Mode= Solar

ClassicCrazy

You will have to explain some more detail like
Absorb setpoint, absorb time, Float setpoint, temperature compensation setting ,  are you using ending amps ?
Also what is your PV setup ?
If you have internet do you have MyMidnite set up - you can get a history graph of what was going on with that.
Larry
system 1
Classic 150 , 5s3p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal 24v pack , Outback 3524 inverter
 5s 135w Kyocero , 3s3p 270w Kyocera   Classic 150 ,8s2p  Kyocera 225w to Hawkes Bay Jakiper 48v 20kwh  ,Gobel 16 kwh  lifepo4 Outback VFX 3648  8s2p 380w Rec pv EG4 6000XP

littleharbor2

Check the clock. I didn't realize it even had one but the time was way off, (hours) Set the correct time.  This was causing my classic to do what you are describing.
This is my query into my issue and the remedy from the good folks at Midnite.

http://midniteftp.com/forum/index.php?topic=5809.msg53077#msg53077
12 Suntech 175's
   Classic 200
   Bogart Tri Metric
   Trace SW 4024 (brand new, sort of, first energized Feb. 2015)
  460 Ah. 24 volt LiFePo4  Battery bank

boB


Seems to me that if the charging is being done at any time other than middle of the night as far as the clock is concerned, that bulk and absorb should happen like you  think it should.

If you are not seeing a bulk-absorb cycle, then either skip days are one or voltage and time set points are not as expected and/or ending amps is set too high.   Something like that.

The clock  should only be controlling when a new day happens.  That is  at 23:59 hours:minutes  of the clock (midnight basically).

I think there may be something else happening here other than just the clock being wrong.  HOWEVER, the Classic is a complicated beast.  Please try adjusting the clock time to be correct just in case I am wrong.

boB
K7IQ 🌛  He/She/Me