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11-12-2022, 13:26
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#1
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Registered User
Join Date: Jun 2013
Location: Up Qld Coast, near Yeppoon.
Boat: Passport 41, Custom Perry in steel.
Posts: 628
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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.
__________________
Oceanrider.
"The floggings will continue until morale improves"
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11-12-2022, 14:31
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#2
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Registered User
Join Date: May 2021
Boat: Passport 41
Posts: 403
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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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11-12-2022, 14:57
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#3
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Registered User
Join Date: Jun 2013
Location: Up Qld Coast, near Yeppoon.
Boat: Passport 41, Custom Perry in steel.
Posts: 628
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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.
__________________
Oceanrider.
"The floggings will continue until morale improves"
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11-12-2022, 15:09
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#4
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Registered User
Join Date: Aug 2008
Posts: 596
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Re: Voltage spike occurring from MPPT to LFP
Quote:
Originally Posted by Oceanride007
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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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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12-12-2022, 03:00
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#6
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Registered User
Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 6,501
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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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Satiriker ist verboten, la conformité est obligatoire
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12-12-2022, 04:08
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#7
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Registered User
Join Date: Jun 2013
Location: Up Qld Coast, near Yeppoon.
Boat: Passport 41, Custom Perry in steel.
Posts: 628
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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.
__________________
Oceanrider.
"The floggings will continue until morale improves"
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15-12-2022, 10:51
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#8
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Registered User
Join Date: Apr 2021
Posts: 106
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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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15-12-2022, 21:30
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#9
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Registered User
Join Date: Jun 2013
Location: Up Qld Coast, near Yeppoon.
Boat: Passport 41, Custom Perry in steel.
Posts: 628
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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).
__________________
Oceanrider.
"The floggings will continue until morale improves"
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15-12-2022, 23:43
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#10
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Registered User
Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 6,501
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Re: Voltage spike occurring from MPPT to LFP
Quote:
Originally Posted by Oceanride007
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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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.
__________________
Satiriker ist verboten, la conformité est obligatoire
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16-12-2022, 15:35
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#11
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Registered User
Join Date: Apr 2016
Location: SE Asia, for now
Boat: Outremer 55L
Posts: 4,160
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Re: Voltage spike occurring from MPPT to LFP
Quote:
Originally Posted by Oceanride007
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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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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16-12-2022, 17:58
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#12
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Registered User
Join Date: Apr 2009
Location: CT
Boat: C&C 34
Posts: 1,064
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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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