Charging issues... low SG

[Vic]

Hi Rngr ..

Thank you for the detailed info on the batteries that you have.

Please DO listen to Trojan,  and follow their recommendations.  Each manufacturer knows what is best for the exact batts you have.

Thanks for your location ...   forgot to look on the wind-sun Forum  before asking here.

With two CCs online,  you may be happier doing timed Absorptions.   This could well change when the M/S FW is used.   If your daily discharges regular,  then you should be able to find time settings that will do the job.  These things need not be perfect.   If your battery bank gets fully charged once or twice per week,  you should be OK.  Initially,  it may be good to not count on the FNDC's readout of SOC.  When things settle in,  you can calibrate it,  but still monitor the SG of a Pilot cell or two as a quick check on SOC.

Good Luck with the EQ.   Vic

[Rngr275]

4 hours into the EQ.
SG has gone from 1.250 to 1.270.

Very slow move in SG initially... batteries electrolyte was ~58-60F
Batteries are warming up should go better.

[vtmaps]

In the post quoted above,  the Timer value display you were proposing  is the countdown of number of seconds that remain until the Absorb stage is terminated due to EA having been met   If this is what you were proposing,  then  this would be helpful,  at least when one is becoming familiar with the EA function,  and how it is working.

If you are terminating absorb with end amps, you do not know how long that will take.  Therefore, I don't see how you could have a timer tell you how much longer it will be until absorb is terminated.

If you knew how long it would be until end amps criteria was met, you wouldn't need to measure amps... you would just use time.  --vtMaps

[boB]

In the post quoted above,  the Timer value display you were proposing  is the countdown of number of seconds that remain until the Absorb stage is terminated due to EA having been met   If this is what you were proposing,  then  this would be helpful,  at least when one is becoming familiar with the EA function,  and how it is working.

If you are terminating absorb with end amps, you do not know how long that will take.  Therefore, I don't see how you could have a timer tell you how much longer it will be until absorb is terminated.

If you knew how long it would be until end amps criteria was met, you wouldn't need to measure amps... you would just use time.  --vtMaps

The timer is a simple one (1) minute  timer.  It starts counting when the EA criteria has been met but
that criteria must sustain for that one minute time.  If, during that one minute of time, the battery
current goes above the EA setting AND/OR  the battery voltage falls below the Absorb voltage
setting, the one minute counter must start all over again.

Watching the counter could just give you an idea if that timer is starting to count and getting
reset all the time or something similar for debugging and learning purposes.

boB

[Vic]

Hi boB,

Thanks.  Yes,  seems to me that this timer would be helpful,  especailly when one is trying to set EA to the correct value,  and for debugging.

The only other thing that I had wondered about is something that indicated just what terminated Absorption.   Have used the Logs to try to infer what it was,  and this works OK.  In some ways it does not matter just what did the termination as long as the EA looks like it was close to the desired EA value.

Thanks boB for your continued efforts to make the Classic work better and better !   Vic

[SolarMusher]

4 hours into the EQ.
SG has gone from 1.250 to 1.270.

Very slow move in SG initially... batteries electrolyte was ~58-60F
Batteries are warming up should go better.

Great! If you could reach 1.275, it should be ok. Your Classic will do the rest of the job, daily. As you can see, even a brand new battery could be sulfated.
Don't forget to keep temp as low as possible, you should stop your EQ if you think these batteries are too warm and resarted a new one (only if needed) after they cool down and always at slow charge (5A max per 100AH of capacity/20hr).
Good luck,
Erik