Could wrong voltage from MPPT 100/50 damage super pack battery?

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nicomauritius asked Dec 10, '20

Could wrong voltage from MPPT 100/50 damage super pack battery?

Good day to you all,

I have installed the following:

Solar array : 800W (Voc 43V)

1x MPPT charger is 100/50

1x Battery: Super pack 25.6V

The system worked well until, the battery was fully discharged and low voltage protection activated.

Than the MPPT couldn't start recharging the battery again. Voltage at the battery was 14.7 V with solar panel input (in float mode), and 0V without.

I discovered later that MPPT voltage auto detect was the issue, and changed the settings manually to 24V using the app. It looks like its working. I am waiting for another blackout to see it MPPT remember that setting.

My question:

Could the prolonged application of 14V (see in red below) from the MPPT on the battery had done some damages to it? Knowing the battery is not supposed to go below 20V.

Thank you for your inputs

Cheers

Nico

Days ago	Date	Yield(Wh)	Max. PV power(W)	Max. PV voltage(V)	Min. battery voltage(V)	Max. battery voltage(V)	Time in bulk(m)	Time in absorption(m)	Time in float(m)	Last error	2nd last error	3rd last error	4th last error
0	12/9/2020	0	220	42.07	0	23.8	3	5	225	34	0	0	0
1	12/8/2020	0	1	42.89	0	14.78	0	3	518	34	0	0	0
2	12/7/2020	0	2	43.65	0	15.1	0	3	260	34	0	0	0
3	12/6/2020	0	2	43.65	0	14.91	3	1	341	0	0	0	0
4	12/5/2020	20	3	43.91	0	14.78	0	2	802	0	0	0	0
5	12/4/2020	1120	615	43.65	0	28.66	419	90	290	34	0	0	0
6	12/3/2020	1870	811	42.86	25.38	28.7	416	64	314	34	0	0	0
7	12/2/2020	490	568	43.65	0	26.25	228	4	198	34	2	34	0
8	12/1/2020	0	2	43.09	0	14.84	1	3	494	34	0	0	0
9	11/30/2020	0	1	44.44	0	17.14	1	1	616	0	0	0	0
10	11/29/2020	2100	803	40.75	0	27.35	808	0	0	0	0	0	0
11	11/28/2020	2480	845	41.68	24.23	28.52	781	7	17	0	0	0	0
12	11/27/2020	2000	800	43.55	24.5	28.67	540	9	265	0	0	0	0
13	11/26/2020	2820	693	41.42	24.45	28.5	760	50	0	0	0	0	0
14	11/25/2020	2360	770	43.55	24.48	28.74	494	90	220	0	0	0	0
15	11/24/2020	2460	843	42.42	24.58	28.5	535	18	251	0	0	0	0
16	11/23/2020	2270	881	43.26	24.52	28.63	588	80	132	0	0	0	0

battery system voltage

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Answer 1 · 2020-12-10T05:28:08Z

klim8skeptic answered · Dec 10, 2020 at 05:28 AM

Error code 34 looks bad. Check your array wiring, making sure that the mppt is wired correctly. (no wiring bypassing the mppt?)

Strange (variable) Absorption times/voltages. Are you using the recommended lithium preset?

I imagine the batteries LVD has kicked in, and the mppt simply has not raised the charging voltage enough for charging to resume.

What firmware is the mppt running?

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Answer 2 · 2020-12-14T17:11:18Z

nicomauritius answered · Dec 14, 2020 at 05:11 PM

Hi Klim,

Thanks for your answer.

I cannot remember which firmware it was.

I didn't change any configuration. I only made sure that it was set for lithium settings and connected it.

Last time I connected to the mppt using a VE direct, it updated the firmware automatically.

Since than it has been working well.

When I see in the data that the max voltage of the day has been 14V, does it mean that the battery sensed the wrong voltage for a few seconds and shut itself down? Because the Mppt kept 14V in float mode at the battery terminals as long as the sun was shinning.

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