I have a 320 watt array, 450AH 12v bank. (4 T105's) my solar power system is working fantastically no problems on a day to day basis. My battery profile that I'm using is s1-4 on and s1-5 off. With this setting it should EQ for two hours. It does not. Only about 15 min. Any ideas???? I have no fault codes or anything. The voltage gets to about 15.1v that is kinda low as well.
Tell us about your loads... SoC in the morning, etc...
No loads were on the batteries all day. SoC in the morning would have to be close to 100%
ave you attempted an EQ AFTER you have drained the batteries to less than 85% SoC and then recharged?
I don't EQ my AGMs so I am not that conversant with EQ other than it should only be done after a full charge profile has been done, and then the EQ is started...
that may well be your issue.
The Brat will attempt to EQ for 2 hours but if it cannot maintain EQ for a short amount of time (it may be 10 minutes, but my memory is rusty on this), it will give up and try again tomorrow. It sounds to me like it's making a best-effort to EQ your batteries but at 100% duty cycle, there's just not enough power available to bring your bank up to EQ voltage. So it gives up, tries the next day, then finally gives up until you request another Manual EQ or the normal Auto EQ delay (30 days) cycles.
Here's something to try. When you want to EQ your batteries, disconnect The Brat and connect your panels directly to your battery. Watch the voltage for 15 minutes. Does it climb above the advertised EQ voltage? If you have problems with this, under approximately identical conditions, that's a good indicator.
And a note on the '10 minutes' rule. It is not a hard 10 minutes, it is a cumulative effect. A counter increases at fixed intervals when its unable to maintain EQ voltage, if it is maintaining EQ voltage, the counter decreases to 0. If the counter is at 0, it stays at 0, if the counter increases up to a value that signifies 10 minutes, it gives up. It also counts how much time it was able to maintain EQ voltage. When it attempts to start up again the next day, this counter resumes. That way, if it can do 90 minutes on day one and then fails, it will try to EQ for 30 minutes the next day. If it fails to complete EQ in those two days those counters are reset.
This logic was implemented to better take care of your batteries. If it's telling you it's EQing your batteries but it's unable to actually bring the voltage up to the setpoint, it's false advertising imo.
In short, it sounds to me like you're not getting enough input power at EQ voltage to bring up your battery in a timely fashion. The Brat is indicating it's having a problem.
Very good info from everybody. Thanks a bunch it is well appreciated.
Seems light on the panel to AH of Battery size
VT
I have noticed when manual setting to equalize that the voltage for equalize 30.1 volts can not be provided by the panels due the position and being winter time ( I also need to get on the roof and give them a wash off). So your PV output may not be enough as stated to perform
the equalize and the reg drops out and does a reset for the next day.
Can you see what the input voltage is coming from the panels or test to check it?