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charge controller error

Charge controller display displays "disconnected" on 100/30.

"Disconnected" scrolls across monitor. System not working. As far as I can tell, the connections and fuses are fine. I had 12.5v, moved my vehicle, and it said disconnected. I connected my spare 100/30 and it works fine.

Wildernut asked
Wildernut edited ·

0 Answers

Charge controller (MPPT 75/15) lights not turning on

I recently chose to replace an older PWM controller with a Victron MPPT 75/15 charge controller, and yesterday I hooked them up to my fully charged battery bank (12.85 V before starting). I followed the instructions, that say that I was to hook up the cables in this order:

  1. Hook up the load
  2. Hook up the batteries
  3. Hook up the PV

Nothing happened on 1, but some leds flashed for a second or so when I connected the batteries. After that, it has seemed dead :-/ I disconnected the various cables to see if it happened again, but they all remained "dead" (no light). Yesterday was overcast/grey, so was getting 16.5-17V from the PV cables (two panels of 140W total max), and I wonder if this is the reason? The manual says it needs Vbat + 5V to start, and I guess that means it would need a minimum of 12.85+5=17.85V from the PV cables to get a starting power? Am I right in understanding this "Vbat+5V" terminology? The system is in a remote location, 3 hours from my home, so I am not able to hang around for sunshine to appear to verify ... Just had to leave and hope for the best :-/

One indication that something was happening is that the initial voltage of the batteries (same reading from the battery terminals as on the screws on the controller) increased after connecting them to the controller, from 12.85V to 13.2V, after a little while. This indicates they were being charged, but I do not understand how, if the controller was inactive/powered off. The LED overview in the manual did not show what "all leds off" indicated, so I assume that would imply a non-functional state.

I read some threads on the same topic for this controller, but could not really glean much info from them (conclusion: hw error).

Points where I have deviated from the manual

  • Did not connect a earth/ground wire, basically because I have no idea how to do that when I did not find any diagram or specific terminal marked "GND" or something
  • Connected everything while the controller was not yet mounted. The manual says it should be mounted vertically, which I did after connecting everything, but I cannot see how/why this should matter.

Debugging info:

  • Voltage reading from BATT screws on controller: 12.85V
  • Voltage reading from LOAD screws on controller: 12.85V
  • Voltage reading from PV screws on controller: 16.8V
  • 4 Concorde Sun Xtender 2580 batteries in parallel connected to bus bar
  • Charge controller connected to 100A busbar (one per polarity)
  • All battery cables of equal length (1m) and terminated with cable lugs or similar.
  • Sufficient cable thickness. 10mm2 for batteries, 6mm2 to load, 35mm2 to PV (long length).

Carl Erik Kopseng asked
Carl Erik Kopseng answered ·

2 Answers

Victron 75/15 overcharging battery

Hi. So my alarm in motorhome was saying leisure battery was overcharging. A 120w panel and victron 75/15 charge controller as been powering up my leisure battery fine for around a month. I connected up to a spare battery and its going up to 15.1 before I disconnect it cause seems to much thanks steve

Steve asked
trollan answered ·

4 Answers

Charge controller data resets to the next day in the middle of the day?

I recently installed the victron mppt charge controller and BMV-712 on my camper with 600 watts of solar, and 200 AH of lithium batteries. Everything seems to work fine and I have everything programmed for the lithium’s but the history of all my solar data seems to reset to the “next day” at odd times. The first time was the day after installing it, it reset at 7pm. So I tried resetting it at midnight thinking there was a built in clock or something. Seemed to work fine for 3 days but now today it reset at roughly 1:00 in the afternoon with basically full sun. I can’t find anyone else having the same issue, any suggestions? Or does anyone know more about how the charge controller judges the time/day?

Stranz4 asked
Jaco Reinecke answered ·

1 Answer

Will input high voltage damage the system?
  1. I have 5 12v panels in series feeding a 100/50 controller. Generally the voltage is between 85-95 volts, but does fluctuate a lot. Is this normal or are my second hand panels bad? Today i got a #33 input high voltage error as the voltage reached 100.5v momentarily. Should i be concerned about damaging the controller with high voltage?

Iamjosh35 asked
dazey77 commented ·

1 Answer

MPPT 150/70 Shows Voltage But No Current

Just finished installing my solar set up in my camper and am having some issues with the MPPT 150/70 (I have no doubt it's installer error).

The blue light labeled "bulk" is flashing every few seconds. The other lights are not on. In the Victron app, it shows approx. 66V coming from the panels but 0W of solar, 0.0A of solar current, and 0.00A of battery current. Also, the battery state is off and virtual load output is off. Batteries seem to be connected properly since lights and fans are working.

Based on other posts in this forum, I have double checked the connections and they seem correct. I checked the polarity of the panels, and they are correct. Breakers are switched on. Connections are as follows (starting from controller):

  • Battery+ to 80A breaker to positive battery bus.
  • Battery- to Victron shunt (BMV 712)
  • PV- to negative PV connection
  • PV+ to 15A breaker to PV positive PV connection

Below are screen shots of the app and the wiring diagram of my system.

Any help is appreciated!





TennAdam asked
TennAdam commented ·

6 Answers

Has anyone’s SS MPPT 150/85 behaved erratically, blue light fluttering, off to bulk to off to bulk?

Last week, I updated the firmware for my SS MPPT 150/85, and the charger immediately began acting erratically. Not charging, blue light fluttering, off to bulk to off to bulk. I thought that it could’ve been a loose connection or bad circuit breaker. So I checked the connections, and the breaker. Everything is fine.
The only change that’s been made is the firmware update. Before that, the system ran flawlessly.

While it’s doing this, there are no error codes.

Alia A asked
ACOrton answered ·

3 Answers

SmartSolar MPPT 100/20 turning the load "On" then "Off" then back "On".

I purchased a Victron SmartSolar MPPT 100/20 Charge Controller. I am having a problem with the charge controller cycling the load "On" then "Off" then back "On".

Description of failure:

1. The charge controller will show that the load is set to "On".

2. A 12v fan is connected that draws a max of 9W of power or a car cell phone charger is plugged in (without the phone connected or charging)

3. The charger controller will show that the load is turned to "Off"

4. Have a pause for 1 to 2 seconds

5. The load will then be turned to "On"

Notes: The charge controller never shows a voltage below 12.6 volts from the battery so I know that it is not pulling a large load from the battery.

I don't see how a 12v phone charger without a phone connected could be tripping the 20A capacity of the controller.

SailboatTN asked
SailboatTN commented ·

1 Answer

Trouble after firmware update fail

So time to ask for help. I did the latest update on the firmware for my VictronConnect Smart Solar MPPT 100/30 it took the first update then it said it needed another and halfway thru it an alert said unable to update due to unknown error. It now says it’s connected to another device ??? Not sure how to reset that in the charger as I’ve done everything to delete it on my phone

Now when I do a search for it on my iPhone thru the VictronConnect app it shows up but it’s shaded and has a connection error (see picture)

I’ve reset my iPhone, I’ve signed out of the app I’ve even deleted the app and still no joy any help would be much appreciated. PS this controller has only had a single point connection in the past and that is to my iPhone.

Thank you in advance


IRHERE47 asked
Matthias Lange - DE answered ·

1 Answer

Error 21 on 100/50 charge controller

Hey All,

I have a 100/50 MPPT connected to 1200 watt solar at 60volt and to a leaf battery. I get a error 21 shutdown on the charge controller. The dealer sent a new one and it worked 2 days and the error came back on this one too. I checked all wires and turned out good. Last time it happened the battery was at 98%. Dealer said there is some sparking going on in the solar wires. But how can if there is no current flowing anymore. On the battery side, there was no load on except the inverter (multi) was on. After some research i only find this error on 100/50s not on any other controllers.

can anybody shine some light on my problem?

TexDoe asked

0 Answers

Mppt charge controller leaking battery voltage to pv input connectors?

Hi, I have a Mppt 150/70 Mc4 and it has been working great for the last 4 years. I have the Bluetooth dongle so I can monitor the PV array out put and then the load.

But now something strange is going on.....

When the sun was setting I noticed the voltage didn't drop to below ~25v. Even when I disconnected the Pv array the voltage is the same. For some reason the Pv voltage is more or less set to the same voltage as the batteries (24v).

It's like the battery voltage is leaking out to the PV connectors. Not until I disconnected the batteries, the controller stopped "charging" (blue light on). And now when I connected the batteries back the voltage for the PV array is again ~24V. I checked with voltmeter that the voltage I was reading on the app was coming to the Pv connectors and it is.... Please help! Is it still safe to use? Is it broken? What can I do?

gojs asked
Mark answered ·

1 Answer

Draining Battery?

My setup:

  • Victron SmartSolar MPPT 75/10
  • 100 Panel on the vehicle roof
  • Odyssey Group 31 battery.
  • 10 gauge wire on the PV and Battery side leads with a 10a fuse on the positive battery lead.
  • No load connected

When the vehicle is in the garage I use a CTEK (Odyssey approved) charger. So the vehicle normally leaves the garage with a full charge. I will drive to the store and turn the vehicle off with a fully battery (around 12.8/9) and look on my VictronConnect app that I am getting PV. I will come back a short time later (20 mins) and my battery is at 12.4 which shows both in the app and also in a separate volt meter I have installed. What in the world is going on?

guardcompany asked
Charlie Johnson answered ·

3 Answers

Controller oscillating power from 14 to 32 volts continuously

I’ve just installed a BMV 712 monitor and a Bluesolar 100/30 controller and I am seeing some very odd behaviour. First this is a dark, gloomy, rainy, windy day here in the Pacific Northwest. I have two hard panels wired in series and two semi flex panels wired in series, both sets wired in parallel to the charge controller. Each panel is 100 watts for a 400 watt total.

With everything connected the power and current from the charge controller oscillates from a low of 14 volts then rises to 32 volts before immediately dropping back to 14 volts. This pattern repeats every 30 seconds or so. The 14 and 32 volt thresholds might change by a volt or two on every cycle but the pattern is consistent. As the volts go up the amps go down. We’re talking 0 to .8 of an amp.

FYI the panels are one year old and worked just fine as configured with my old Epever controller. The wiring has not changed

has anyone seen or is familiar with this pattern? Any suggestions?

Don Binns asked
Don Binns answered ·

3 Answers

Smartsolar mppt 7515 configuration error

While trying to read a configuration file I got the following

#119 settings data lost the charger cannot read its configuration and stopped.

I followed the reset instructions but they don't work, how can I get my controller working again?

Riggers asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Easysolar issues


I have an EasySolar48v 5K 70a controller charger set up in July this year. Summer has been great, the 6 x 500w panels have been rocking it. Charger and panels came from Bimble Solar who haven't given me any answers to my problems.

We have 4 x AGM 200aH batteries in the system, they're about 3 years old now.

The SOC on the colour panel has never dropped below 99% the BMV attached dropped a little more but no less than 97% the last couple (ahem) of weeks have been cloudy and wet (I'm in the East Midlands - UK ) and the low battery warning has come up a few times and the controller has even switched off. But the SOC still reads 99% ???

We have a 5Kv Honda genny plugged into the AC input on the controller, when I give it power, it accepts for about a minute (in bulk charge) switches to float for about 5 seconds then cuts the AC input. The batteries remain in a low power state. Once the sun comes out, it's happy again taking charge from the panels.

I haven't had a comprehensive wiring diagram to follow, just used common sense and deciphered what I could from the manuals for each device... the one thing I wonder about is the v-sence port on the charger controller, it's not attached to anything at the moment, should this be attached directly across the battery terminals? Does this feed the metering for the SOC? Its the 2 pin connection.

Help much appreciated as I don't want to damage another set of batteries!



fash asked
JohnC commented ·

4 Answers

Multi Control Panel (VE..BUS) - glitch/loosing contact with MultiPlus Compact

I have a Multiplus Compatc 12|1600|70 that is controlled by a VE. BUS MULTI CONTROL. When removing the panel and adding som pressure to the CAT5 ethernet cable the Panel starts. Any one experienced this behavior, and have you found the root cause?
If i´m to change panel, can I upgrade to something better?

Rickard asked
JohnC commented ·

1 Answer

SmartSolar 250/100 doesn't charge batteries

Some time ago charge controller Smart Solar 250/100 have been stopped charging batteries. System consist from 4 SmartSolar 250/100; Quattro 10 kW; Pylontech US3000; Fronius Symo 5kW; CCGX. During day time it sees normal voltage from PV but it doesn't want to charge.

The strange thing is that on that charge controller that does not work, there is voltage about 38V from the PV side at night. Everything else is working. How to fix this problem?

Thank you in advance.

Timofei Pasechnikov asked
Mikael edited ·

1 Answer

Does higher voltage carry more Amperage? I'm getting higher Amps with lower voltages.

Victron 150/35 with BT dongle, LiOn Batts at 36 volts, 7X100 watts panels, 12 gauge 25ft cable to the charge controller, when I switch the charge controller to 48 volts, the voltage goes up but the Amperage goes down. If I switch back to 36 volts, the voltage goes down and Amps go up. I understand that is negative resistance, the backup system setup remain the same no other changes, except that when the batteries have been charged at 36 volts to full, I switch to the GTI and divert the charge controller output to the house to use excess power. the GTI can accept 20-60 volts input it can generate up 3.5Kwh on a good day which is half of my daily power consumption year around except during Summer months where my consumption goes way high because of the AC unit. asked answered ·

2 Answers

Charge controller showing no current suddenly.

I've got a 50/100 charge controller on my camper, 2 100 watt panels, and a single 100ah battleborn battery.

I recently had my camper in to get my radio wired into both the engine battery and camper battery with a switch between. I realized they only hooked it up to the camper battery when the battery completely died. I tried to charge it with my shore power hookup. I think since the battery was dead, something wasnt recognizing a battery being there and it wouldnt charge it.

I then unhooked everything from the battery, and jumped it from the engine battery. hooked everything back up, and was able to charge it through shore power from there, and everything functioned normally.

Im wondering if when hooking everything back up i blew a fuse in the charge controller itself? my other thought was that I might have blown one of the inline fuses coming from the panels, though I've got a 20a fuse between my battery and charge controller, Id be surprised if it was the solar panel inline fuses.

I havent been able to check them because the renogy mounts make it an absolute pain to reach the bolts. Otherwise I'd have to remove the mounts from the roof itself which means a lot of disassembly to access those mount bolts, which i'd really like to avoid.

Does this sound like a problem with the charge controller itself? any other Ideas?

Scandy1 asked
ejrossouw commented ·

3 Answers

Charging Issues - SmartSolar 100/20 - One Solar Panel (245w) - 12v System

I have been having issues with my charge controller.

I have one solar panel (specs below) connected to the "Victron 100/20 SmartSolar MPPT" charge controller. When I tested the panel directly, the multimeter was reading 37.2v.

There are 2 x 12v leisure batteries (haven't been charged in a while) wired in parallel to the controller. The controller light flashes blue when the batteries are connected, but no change when the solar panel is connected.

Solar Panel specs:

Maximum power (pmax +10%,-0% - 245w
Short Circuit Current (Isc) - 5.86a
Open circuit voltage (Voc) - 53.0v
Maximum power current (Imp) -5.54a
Maximum power voltage (Vmp) -44.3v
Mamimum system voltage -1000v

Readings from charge controller:

Battery: 12.49v
PV: 12.3
Load: 12.49v

I tested it again after a few hours and the Load was 12.45v.
Are these the reading I should be getting? Or is something in my set up wrong? I was told this controller would work in creating a 12v system (very important, don't want 24v).

"Nominal PV power, 12V - 290W":,-75-15,-100-15,-100-20,-100-20_48V-EN-.pdf

Any help would be much appreciated.
Thank you.

victronmeldrew asked
Justin Cook - Bay Marine Supply USA answered ·

2 Answers

100/50 Charge Controller seems to not be working properly

The 3 300 watt 24 volt solar panels are connected in parallel to a 100/50 controller. I have triple checked the circuit both for continuity and polarity. The incoming voltage is 37V and the output voltage is 24V. the controller is set for 24 volts 50 amps. The absorption is set to 23.8V and the float to 24.2V. Max voltage is 25 Volts. The battery is a Tesla Model S with 233 AH. In full sun with an 82% charge on battery the system only shows 1 to 4 watts being produced. I don't think its the battery, the MuliPlus charges it to 100%.

jubal48 asked
jubal48 edited ·

1 Answer

No Current or Load shown BMV 712

System has been installed and working perfectly for about a year now. However, a few weeks ago after the battery bank was fully discharged once, now the bmv will not show any current or load, positive or negative, despite DC or AC draw occurring, or when connected to shore power.

Pic of the BMV showing now draw positive or negative (appliances are on):


The MPPT shows only a small current coming in. Also, the solar doesnt seem to take in more than 20 watts or so at any given time, even under addition load that I think would call for it. Pic:


When I turn on a load, like the DC LED lights for example, the voltage on the battery bank drops significantly for a short period. See pic of LED lights turned on and voltage drop for a few seconds:


When I do the same for a more significant load, like the maxxair fan, the voltage drop is more significant and lasts a bit longer before stabalizing (60-120 seconds).


Keep in mind no changes to the wiring has occurred, and the system worked perfectly for a year. Could the mppt have gone bad or the BMV or both due to the full discharge cycle that occurred? The batteries are Lithium from Battleborn. Could the surge on the batteries when applying a load indicate damaged batteries?

Thanks in advance

Sufficeguy asked
Justin Cook - Bay Marine Supply USA answered ·

1 Answer

75/15 load switching on/off

75/15 controller, fitted in a campervan approx 2 weeks. 100w solar panel is clipped to the roof & connected to controller when needed.

Lastnight on a campsite with electric hookup (2nd time since installation), so solar NOT connected, & 240v charger connected directly to battery.

Anything connected to the 75/15 "load" is pulsing on/off...2seconds off, 4seconds on.

Load is connected (via 6-way fusebox) : phone-chargers, gps-tracker, CB radio...nothing high-power.

The blue LED "Bulk" is flashing about every 3s.

Any ideas?


Hardware firmware:v1.39

Interface V2, firmware:V2.19

Bootloader: V1.10

mburton2 asked
slydar commented ·

3 Answers

Sizing charge controller

Please may someone clarify something for me on sizing charge controllers:

They are identified as, for eg, 150/100 12/24/36/48.

150 is panel VOC max, 100 is Amps and the rest are the system voltage.

I have been taught 2 conflicting sizing methods:

The number of panels max useable is:

a) based on Amps/(n strings x Isc) i.e. 3 x 265Wp panels per string at 9.03A = 11 strings or 33 panels or 8745Wp (but the MPPT sizing calculator does not offer this answer)

b) based on system voltage x Amps i.e. 48Volt system x 100 = 4800Wp at 3 per string (based on VoC max) = 18 panels maximum. (but the MPPT sizing calculator says we can have 24, or 6360Wp)

Or a 24Volt system = 9 panels maximum, for the same charge controller.

Seeing as the MPPT calculator gives neither answer, then how am I going wrong, or is the calculator wrong?

Many thanks

Tal asked
JohnC answered ·

1 Answer

Charge controller is non responsive

Hi , I’ve just had my ford transit outfitted with 3 360 watt panels, multiplus compact 12/2000/80-50/120v ,smart solar charge controller mppt 150/85-Tr , BMV-712 smart and 3 battle born 12v lithium batteries. All was going well with the install and mounting of panels but when the power was turned on to the controller the lights flashed as it started up but immediately the electrician and I heard the “click” of what was assumed to be the breaker. Immediately it was apparent that the negative cable from the battery was not in its slot in the bottom of the charge controller, all other connections were in place , the positive cable , the PV cables. Once the negative cable was put in place ,the power was turned back on but the breaker would not reset , leaving the charge controller with no power. I have since unhooked all connection to charge controller and reset the breaker successfully. Thank you for any help or info about what has happened or what should be done about this unfortunate dilemma.

tjr2059 asked
Guy Stewart (Victron Community Manager) edited ·

1 Answer

Boondocking with BMV-712: SOC error? Best practices?

I have the following setup: smaller 2015 Lance travel trailer with 2ea 12V lead acid flooded batteries in parallel, BMV-712 and the standard Honda 2kW generator. The trailer's battery charger seems modern (3-stage charging, lots of amps, etc.).

I plan to boon dock (no shore power) regularly and would like to tune the BMV-712 to help keep the batteries charged, healthy, and to know when and how long I should run the generator.

From research, I know I should always keep the batteries above 50% capacity to avoid premature replacement costs. Also, without many hours of charging (e.g., plugged in or on solar), I cannot expect battery capacity to rise above 90% while boon docking.

When charging from, for example, ~60%, the charger will be in the "bulk" mode with high current, and rising voltage. This charge mode is the quickest, but only gets to 80% capacity.

Then the charge mode changes to "absorption" where the charger voltage is held high (14.6v in my case) and then the amps fall off toward ~2amps (in my case) when the charge mode changes to "float" at which the battery capacity is at 90%. To charge from 90% to 100% capacity would take many hours and isn't reasonable while boon docking.

Therefore, while boon docking, I should expect to cycle the battery between 50% and 90% depending on loads and generator run-times.

However, AFAIK, the BMV-712 is designed to treat the 90% charge state as "100% SOC" (?) The BMV-712 decides that when the voltage is the high "absorption" mode, and then the current drops below a "tail current", it proclaims SOC = 100%. But in reality, the battery is at 90% capacity at that moment (i.e., at the end of the "absorption" mode).

If starting from a full-charge (i.e., batteries have been plugged in for a day), the SOC value will be fairly accurate. However, if not starting from a true full-charge (allowing the BMV-712 to auto-sync the 100% SOC value at the end of the absorption mode), the reported SOC value will be 10% lower than reality. So the accuracy of the reported SOC value depends on whether the previous charge completed the float mode? Is this true?

If that's true, then I must tweak other settings to make the SOC value match reality or add-in some fudge-factor or work-around.

I could:

  • tell the BMV-712 that the "battery capacity" is 10% lower than the battery specification.
  • set my "SOC relay (charge floor)" to 60% instead of 50%, and mentally never let the reported SOC value fall below 60%

Is this a known problem with the BMV-712 SOC value? What do others do to work-around this inaccuracy?

Do other boon dockers have tips on using the BMV-712 to stay confident that the generator is running for the right amount of time?


goodguy5000hd asked
ben answered ·

1 Answer

Mppt 150/35 charging battery with generator problem

Charging the batteries with the generator, used to take about 2 hrs when batteries were drained... Now it charges 20 - 25 min and the yellow light starts blinking.. Indicating the batteries are fully charged.. What is the solution to the problem?

Annolene asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

Lost the MPPT 150/70 connection on the ColorControl

Good day, I just lost the"connection" between the 150/70 CC and the Color control ? Suddenly.

The Color control shows "not connected" for the Charge Controler .

Checked the cables and they seem OK.

Checked to "see" the CC with bluetooth and I do see it there .

Any idea what can have gone wrong ?


Herve RV Nizard asked
Herve RV Nizard answered ·

2 Answers

Erratic Output from SmartSolar MPPT 100/50

This system is in an RV (caravan). Victron Energy equipment includes SmartSolar MPPT 100/50, MPPT Control, BMV-712, VictronConnect App. Batteries at 100% SOC, 1.81A load, 600W solar array. It seems the controller has difficulty providing only the 1.8 amps drawn by the load steady state when the batteries are floated and not drawing any current. In this case, the solar controller stops supplying current, the battery drives the load, and then the solar controller pulses a bunch of current back into the battery to replace the charge used. Then stops, letting the battery continue to drive the load. This happens every few seconds. Charge current is steady when batteries are less than 100%. Here is a link to a video showing this MPPT 100/50 behavior

Dave556 asked
Guy Stewart (Victron Community Manager) edited ·

1 Answer

Blue solar v1.42 history error

Hi guys,

Noticed as error with the history of my Blue solar 75/50 running firmware v1.42. Same error with Victron Connect 5.7 and 5.8b3.

History with my SmartSolar 100/50 is fine with v1.42.

v1.42 seems fine otherwise.


klim8skeptic asked
Martijn Coster (Victron Energy Staff) answered ·

1 Answer

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