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Post by Richiegan on Apr 5, 2017 16:16:15 GMT -8
Here is my setup.
1 - 100W panel/ 20 VDC panel: 1 - 20A MPPT controller: 2- Duracell DC27 Batteries rated at 60Ah. MT-5 meter came with controller.
Here is my question, When the batteries are fully charged at 12.5/6 DC the MT-5 says they are at a 35% SOC. I have the battery type set as "FLD" and the AHr at 120, I've also played with the numbers and can not get the MT-5 to show a SOC% of 100 or anything close. Is my setup incorrect?
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Post by rabird on Apr 5, 2017 17:37:49 GMT -8
Your group 27's should be ~90ah each.
Does the voltage get up to mid 14v during the day?
These Soc based on voltage are bogus, 12.2 v is 50%.
@ 180 ah total, a 100w is ~5.5a charger or 3% which is not much.
To me a fully charged flooded 12v needs 14.5v held constant for several hrs.
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Post by tattoo on Apr 5, 2017 18:46:46 GMT -8
Here is my setup. When the batteries are fully charged at 12.5/6 DC the MT-5 says they are at a 35% SOC. Is my setup incorrect? Yes your set up is reading right... Mine never says it's at 100% most of the time it's less than 50%... And mine floats 14.8v everyday that the sun is shining with no clouds.... Now you need to answer Rabirds question to be for sure... |
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Post by jbourne84 on Apr 12, 2017 10:14:45 GMT -8
I get similar bad readings from my MT-5, at 13.6 or or 14.6v charging during the day it will read 100%. As soon as charging stops with the sun going down it will tell me 60% while sitting at 12.6/7v. I'm very curious what others say about this issue, its as if the meter views the peak voltages as full and anything less must mean its been discharged.
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Post by rabird on Apr 12, 2017 16:26:27 GMT -8
voltage as SoC is bogus and the logic doesn't know much!
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Post by jbourne84 on Apr 13, 2017 10:26:08 GMT -8
Your group 27's should be ~90ah each. Does the voltage get up to mid 14v during the day? These Soc based on voltage are bogus, 12.2 v is 50%. @ 180 ah total, a 100w is ~5.5a charger or 3% which is not much. To me a fully charged flooded 12v needs 14.5v held constant for several hrs. My solar system (20 amp Tracer mppt) does get up to around that voltage, not sure exactly, 14.5-14.6 I think, but im not sure how long it sits there. Should I use a secondary charger occasionally? Maybe something that plugs into a wall outlet? If yes, what sort of charger will hold at that voltage? |
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Post by rabird on Apr 13, 2017 16:31:38 GMT -8
nothing beats solar charge controller. If ya get to mid 14s for a while and then float consider fully charged. an occasional equalization (every 30 days most controllers, 15-16v) ain't bad. finding a charger that does that is near impossible!
Topping off via any 120v charger is good when the sun don't shine or ya deplete the batteries beyond what solar can replace.
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Post by richiegan on Apr 19, 2017 15:05:09 GMT -8
I will reset the AH on the DC 27's to 90 ah. The main voltage from the controller seems to be 14vdc and 14.5 vdc. Strange thing is if I disconnect the panel from the controller and batteries, then reconnect the batteries wait 20 seconds then connect the panels, the panel volts reads at 21.5 and steadily drops to 13.5 / 14.0 vdc, my thoughts is the controllers MPPT function converting excess volts to amps (am I correct in this assumption).
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Post by tattoo on Apr 19, 2017 16:26:19 GMT -8
I will reset the AH on the DC 27's to 90 ah. The main voltage from the controller seems to be 14vdc and 14.5 vdc. Strange thing is if I disconnect the panel from the controller and batteries, then reconnect the batteries wait 20 seconds then connect the panels, the panel volts reads at 21.5 and steadily drops to 13.5 / 14.0 vdc, my thoughts is the controllers MPPT function converting excess volts to amps (am I correct in this assumption). Yes you are correct... |
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