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Old 11-12-2022, 13:26   #1
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Voltage spike occurring from MPPT to LFP

The other day was looking very closely at my Victron MPPT Trends, I noticed that every 5 minutes or so, it would disturb my regular charge and give me a pretty high voltage spike like 15 volts, only for a short time like less than a second, still it is excessive, think it was happening on both Bulk and absorb cycles.

Sorry about poor image.

Any thoughts, other than disrupting a high rate of charge, is it dangerous to my LFP.
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Old 11-12-2022, 14:31   #2
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Re: Voltage spike occurring from MPPT to LFP

Do you have only one mppt? I saw that as well on my victron trends when I had an unbranded mppt and my lfp was fully charged. Replaced that mppt with another victron and stopped seeing this issue
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Old 11-12-2022, 14:57   #3
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Re: Voltage spike occurring from MPPT to LFP

I have 2 MPPT 100-50 Smart and a 75-15 with a blue tooth Dongle they are networked with the BMV.
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Old 11-12-2022, 15:09   #4
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Re: Voltage spike occurring from MPPT to LFP

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Originally Posted by Oceanride007 View Post
I have 2 MPPT 100-50 Smart and a 75-15 with a blue tooth Dongle they are networked with the BMV.



I thought that Victron superficially says that the MPP chargers if they are to be networked MUST ALL BE THE SAME. FIRMWARE.. Model #.. etc.


(Sorry... Right after I posted I realised it was Victron CHARGERS I had read that in...)


Not sure about MPP controllers.. shall check



I seem to recall that for the Skylla-i 24/100 instructions...
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Old 11-12-2022, 16:15   #5
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Re: Voltage spike occurring from MPPT to LFP

Looking further (as I believe that there was an issue with different chargers) it appears that a blog post from 2013 says no problem, with different types:



https://www.victronenergy.com/blog/2...controllers-2/


but in 2019 people are still having some issues..



https://community.victronenergy.com/...pt-to-one.html


It does appear that you want stuff as upgraded as possible..
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Old 12-12-2022, 03:00   #6
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Re: Voltage spike occurring from MPPT to LFP

Could be just the controller checking the battery voltage.
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Old 12-12-2022, 04:08   #7
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Re: Voltage spike occurring from MPPT to LFP

^^^ Hi Raymond, will miss you this year. Starting to think that it may be incompatibility of 2 different sized MPPT that are networked. next time Ill try monitoring both MPPT, Actually I'm more interested in knowing if that spike is potentially dangerous to LFP.
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Old 15-12-2022, 10:51   #8
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Re: Voltage spike occurring from MPPT to LFP

Can you give some more details about your installation? What LFP batteries do you have, what BMS, how much solar do you have installed?


It could be that the internal BMS is blocking charge current due to severe cell imbalance, causing the MPPTs to dump their output and resulting in an increased system voltage. Victron MPPTs are fine with this, and as long as the surge stays below 16 V, most other electronics don't mind it. But nevertheless such disconnects indicate that there are issues.
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Old 15-12-2022, 21:30   #9
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Re: Voltage spike occurring from MPPT to LFP

All my components are from EV power in Western Australia.

Power from the 2 solar arrays with own MPPT controllers are not being interrupted by BMS, There is a network via Bluetooth that informs the MPPT the true Terminal Voltage (There does appear to be a little voltage drop between the MPPT and Battery Terminals).
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Old 15-12-2022, 23:43   #10
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Re: Voltage spike occurring from MPPT to LFP

Quote:
Originally Posted by Oceanride007 View Post
All my components are from EV power in Western Australia.

Power from the 2 solar arrays with own MPPT controllers are not being interrupted by BMS, There is a network via Bluetooth that informs the MPPT the true Terminal Voltage (There does appear to be a little voltage drop between the MPPT and Battery Terminals).
Some solar controllers switch the charge current off in order to check the battery voltage without the charge current acting against the internal resistance of the battery elevating the voltage. With Plasmatronics regulators the rapid off/on cycle is indicated by a rapid blink of the readout.
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Old 16-12-2022, 15:35   #11
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Re: Voltage spike occurring from MPPT to LFP

Quote:
Originally Posted by Oceanride007 View Post
The other day was looking very closely at my Victron MPPT Trends, I noticed that every 5 minutes or so, it would disturb my regular charge and give me a pretty high voltage spike like 15 volts, only for a short time like less than a second, still it is excessive, think it was happening on both Bulk and absorb cycles.



Sorry about poor image.



Any thoughts, other than disrupting a high rate of charge, is it dangerous to my LFP.

I’ve got three VE MPPTs with two the same and one different. They’re VE.Smart networked along with the primary shunt and are externally controlled by our BMS. I haven’t seen the same behaviour that you are posting, though without being able to decipher your screen capture it doesn’t really look like anything bad is happening. Voltage and current will often spike together but not very far from their short term averages. Weird. You have updated firmware to latest?
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Old 16-12-2022, 17:58   #12
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Re: Voltage spike occurring from MPPT to LFP

How many Victron products do you have installed? Multiple battery banks?


Seen this before, MPPT was using a remote voltage detection from another device that was on a battery not being charged.
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