Hello all. First post. Looking for help regarding a problem I'm having with slow charging of 6 volt AGMs.
I have two systems on two RVs parked side by side. The systems are identical other than one has 4 Trojan T105 flooded (total of 450 AH) while the other has 4 Crown AGM (total of 420 AH). Both systems are comprised of three 160 watt panels in parallel feeding Borgart Engineering SC2030 charge controllers communicating with 2030 Trimetrics.
With the Trojans (they're two years old) this setup has always worked well. With about 15% DOD I reach absorb of 14.8 vdc followed by full charge and float by noon most days, even before getting max charge amps. With the same charging rate going into the Crown AGMs (they're 2 months old) I rarely reach absorb of 14.6 or full charge by day's end. Voltage just rises to about 13.5 and hangs there for a long time.
Put simply the AGMs take forever to charge while the flooded Trojans behave as expected with the same charge rate. What would cause this? Wiring is correct and both charge controllers seem to be working as designed and have correct programming.
My second question is something I've never been able to get a good answer to: if the AH removed during a discharge is replaced (plus a little more) is the bank full even though absorb voltage was never reached and held there until current falls below 2%? With flooded the SG and open circuit voltage after resting seems to indicate it is but I'm unsure about AGMs.
Thanks in advance for any insights.
I have two systems on two RVs parked side by side. The systems are identical other than one has 4 Trojan T105 flooded (total of 450 AH) while the other has 4 Crown AGM (total of 420 AH). Both systems are comprised of three 160 watt panels in parallel feeding Borgart Engineering SC2030 charge controllers communicating with 2030 Trimetrics.
With the Trojans (they're two years old) this setup has always worked well. With about 15% DOD I reach absorb of 14.8 vdc followed by full charge and float by noon most days, even before getting max charge amps. With the same charging rate going into the Crown AGMs (they're 2 months old) I rarely reach absorb of 14.6 or full charge by day's end. Voltage just rises to about 13.5 and hangs there for a long time.
Put simply the AGMs take forever to charge while the flooded Trojans behave as expected with the same charge rate. What would cause this? Wiring is correct and both charge controllers seem to be working as designed and have correct programming.
My second question is something I've never been able to get a good answer to: if the AH removed during a discharge is replaced (plus a little more) is the bank full even though absorb voltage was never reached and held there until current falls below 2%? With flooded the SG and open circuit voltage after resting seems to indicate it is but I'm unsure about AGMs.
Thanks in advance for any insights.
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