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Hi All
I have a Easysolar, running Multiplus 48/5000/100 with 4x 390Wsolar panels ( 2 pane ls in series in parallel) and 4 x 48v Aeon batteries parallel.
I am getting low voltage faults late in the afternoon, batteries; are fully charged. The recorded voltage drops to 30 v resulting in Low battery Voltage. Fault and inverter shutting down.
I have checked connections to battery and all look ok.
what could be causing this wide range of voltage?
It is most likely a battery bms shutting down intermittently. Try lowering your charged voltage by 0.1 or 0.2 see if that makes a difference.
How do you have the batteries connected? Because of current sharing the end units have the issues.
This is a handy book to refer to describes the issues with banks like yours.
thanks for the response.
the four batteries are in parallel, each connected to a bus bar, bus bar is solid brass 100mm2, 120mm long. + and - are at the same end.
The battery manufacturer recommends absorption voltage of 56.5v, float float voltage of 54.00v and charge current of 38A . I will lower the absorption and float voltages by 0.2v
wiring unlimited is very a great reference, i have used it a lot.
Let us know how it goes. If this does not work then there are a few other troubleshooting steps that can be tried out. Such as charging them individually. Or adding balancers to the system.
We have had a set of batteries whose bms were a bit sensitive at 100% charge. When a load drops off on the house like a pump switching off the overshoot has to sink somewhere used to cause the bms shutdown.
Your batteries are probably passively balanced so the absorption voltage is probably quite critical. Do you know at what stage of charge the batteries are in when the system shuts down?
I have been testing the setup using a constant load of 165W, a pump.
the issues has always occurred at full charge at the end of the day once solar input has started to drop off.
I ran the load all night and the battery voltage has dropped to 48.7V. I will leave the load on all day to see if lowering the charge voltages works.
cheers
thanks for the response
the battery manufacturer suggests to leave this at default setting but it can be turned off, but also suggest it is install specific. i will try this this tonight after have seen the results of dropping the absorption voltage.
cheers
After changing the Absorption Voltage to 56.3v and the Float voltage to 53.8v, the system has work well all day without any alarms.
i will continue to test the system over the next few days and let you know if anything changes.
thanks for all of your help
Cheers
Hi Alexandra
after running over night last night; the system has tripped again tonight. With the batteries isolated, solar panels isolated the batteries were reading zero volts the plot below shows a massive voltage drop to 16 volts from 52 volts
Over the last week the low voltage trip log is below, time is UTC not local time. The plot below shows the low voltage excursions
Device |
Triggered by |
Description |
Started at |
Cleared after |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-28 08:24:03 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-28 08:22:28 |
32s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-28 07:30:54 |
50m, 27s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-28 07:30:17 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-28 07:29:26 |
31s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-28 07:28:44 |
31s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-26 06:51:33 |
1h, 55m, 6s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-26 05:21:22 |
23m, 18s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-26 05:20:47 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-26 05:20:12 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-26 05:19:38 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 22:15:09 |
10m, 13s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:40:02 |
2m, 46s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:39:09 |
28s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:12:48 |
24m, 21s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:12:13 |
31s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:11:42 |
28s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:09:11 |
2m, 27s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:08:36 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:08:05 |
28s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 08:07:22 |
36s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 07:27:36 |
39m, 41s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 07:26:56 |
31s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 07:26:16 |
32s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-25 07:25:30 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:32:00 |
12h, 37m, 2s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:31:21 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:30:37 |
33s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:29:42 |
31s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:21:15 |
3m, 20s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:21:15 |
49s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 08:21:15 |
29s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 07:08:06 |
1m, 29s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:54:05 |
9m, 41s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:53:29 |
29s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:52:00 |
1m, 23s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:51:59 |
48s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:51:59 |
30s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:16:27 |
24m, 2s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:15:52 |
31s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:15:15 |
33s |
|
VE.Bus System |
Automatic monitoring |
Low battery: Alarm |
2020-12-24 06:14:41 |
29s |
it might be time to look at your other trouble shooting options
cheers
Dave
This is a difficult one to diagnose remotely. Something is definitly causing the battery bms to shut down. So a few steps before contacting where you purchased the batteries from. Unless you want to start there?
How are your temperatures around your battery installation?
The next thing to check is if each pack is a different voltage. Measuring them each separate from the circuit.
You could try charging each one separately using the recommended specifications and seeing if that helps. If anything it may help seeing if it is all the batteries or just one or two.
The one thing that the process is certainly going to be inconvenient.
In the advanced tab on the VRM do you see your batteries getting into the absorption stage?
I agree that something is causing the batteries to trip on over voltage, and it seems t be related to the period when the solar input is decreasing and the batteries start to export
i have looked at the battery voltages individually and they are all very similar.
once the batteries reset, they come back as fully charged. i will check this morning to get the exact values
batteries are rated up to 65 degrees C. ambient temp over the last week has not gone over 25 C. Faults are being seen at end of the day as the temperature is dropping.
I have spoken with battery supplier, they have not gotten their heads around the problem yet.
cheers
DVCC is not enabled
ess assistant is not being used.
no specific reason for these settings
Hi
whole system has collapsed now, Multiplus won't switch on, Batteries trip with any load,
I have to wait till the battery supplier is back on line after new years. I am forming the view that he overall system set up was not appropriate. using the Easysolar 48/150/100 with 4 x 390W solar and 40ur 48V batteries to feed a 165W continuous load was not workable and only tapping into the lower end of the multiplus capability. thanks for all of you help
That is very disappointing for you. LTO batteries are a significant investment.
If you are keen try charger only mode on the Easy and leave it like that for a day or so or untill your supplier gets back to you.
I love our Easy solar use it for everything base loads are about 180w except when I am ironing and the geyser is on. But we do have 4000w of solar to keep up with the loads and charging.
Than you for the update. We will be keen to know what the deal is with the batteries.
after a firmware update (using the Victron Connect App and the Mk3 to USG cable) on the Multiplus, connecting the BMV directly to the Color Controller ( VE Direct cable), changing settings on the Multiplus (via VEConfigure 3) and MPPT (via the color controller) that reflect the Lithium Titanite batteries all seems to running smoothly.
thanks for your input and interest
cheers
