MPPT - Solar Charge Controller Image

MPPT - Solar Charge Controller

SmartSolar 100/20 Load Momentarily Disconnecting.

I have the above solar controller. My caravan is connected to the load, the most I've had on the load is 10amps, so it's not that causing the disconnection BUT.......

When the sun fades and the input from the PV drops, the charger switches off, at this point the load is switched of for a split second and reconnected, it does this every day.

I've just downloaded the latest App for Android, and I've installed the latest firmware for the 100/20.

The problem I have is, when the disconnection/connection occurs, all my lights in my RV come on, so if I'm not there, I'll end up with flat batteries, and if I have to disconnect my battery when I'm away, what's the point of having solar as it won't charge a disconnected battery.

I live in my caravan, so I'm here most nights, to sort the problem out, I thought I was Upgrading when I put this controller in as I only had a PWM controller, wired the same, but this controller seems to be a step back for me.

Can someone from Victron please sort this out for me?



paddy1969 asked
Thiemo van Engelen (Victron Energy staff) answered ·

2 Answers

Where is my power going?


I have just gotten my setup up and running, and are currently testing the actual output of the solar array.

But I have found some discrepancies between what the SmartSolar, the SmartShunt and the MultiPlus are reporting.

In the "pure" charging scenario, the smartsolar reports 174W coming in, but the battery is only getting 147W.

In the AC discharge scenario, the smartshunt is reporting -2184w from the battery, but the multiplus are only outputting 1897w.

Where are my watts going? :)



bomadsen asked
bomadsen commented ·

2 Answers

SmartShunt and Smart MPPT 75/15 current draw

Hello all, first post here.

A couple of days ago I installed a SmartShunt 500/50 and a 75/15 Smart MPPT controller in a motorhome. When everything is off and nothing can be used the shunt is showing current draw of 0.10A to 0.20A.

According to the datasheets, the MPPT has self consumption of 10mA, and the SmartShunt is <1mA. 11mA combined for the two. However, I'm drawing 10 to 20x more. The accuracy of the shunt is ±0.1A, so shouldn't it be reading 0.1A as a maximum? I appreciate this is a minor amount... I'm just curious as to why the numbers are 10 to 20 times out.


A couple other question while I'm here:

Is there any value in creating a VE network and joining both devices?
For the shunt, I only updated the battery Ah. Did I need to do anything with other settings and options (Sync SOC, zero current calibration, charged voltage etc)?

I didn't really know anything about solar and electrics before this, so it's been a steep learning curve! Many thanks in advance.

pablo79 asked
ecarriel commented ·

2 Answers

charge controller goes in to float when batteries are not charge. is this correct?

I have Victrons 100|50 - bluetooth - MPPT charge controller, and - also bluetooth - shunt.
The charge controller goes in to float every day, even though the batteries are not fully charged (as seen in the app). I had expected the charge controller would only go in to float mode when the batteries are fully charged. Was my understanding wrong, or what is going on?
I have three 140Ah batteries connected in parallel if it matters.

Edit: 100| 50 not 150|50.


  • 4 x 120W panels connecting in series, giving 480W at about 80-90v.
  • 3 x 140W Varta batteries (
  • Victron SmartSolar 100|50 MPPT charge controller
  • Victron SmartShunt


  • The Charge controller and shunt are linked via bluetooth on a network.
  • Smart shunt:
    • battery capacity is set to 420 Ah
    • charged voltage: 13.2v
    • discharge floor: 50%
  • Charge controller
    • absorption voltage: 14.7v
    • float voltage: 13.8v
    • equalization voltage: 16.2v

ssssssssssssssssssssssssssssssssssssssssssssssssss asked
ssssssssssssssssssssssssssssssssssssssssssssssssss commented ·

1 Answer

Bluesolar MPPT 75/15 HS ?


I connect 2*40W polycristalline PV on my MPPT 75/15 to charge 7 Ah battery (for electric car). VictronConnect shows me : Power = 15W, Voltage = 19.2V, Current = 0.8A during Absorption. When I connect only one 40W module, things seem better (e.g. Power rises above 26W). Measured directly, each PV gives Voc ~21 V, Isc ~ 2,4A.

A couple of months ago, I connected 600W PV on this controller without any problem…

Any explanation ?

Manda asked
Manda commented ·

3 Answers

MPPT with multiple source inputs?

I have a boat with three different areas planed to have solar. Each will be shaded at tie but with luck not all at the same time. Is there ever going to be a single MMPT controller that will handle multiple arrays instead of buying one MMPT controller for each array?

paul-reading asked
myhomebuzz answered ·

1 Answer

Equalization not possible for Victron off-grid AC coupled and DC coupled systems.


I have spent many hours and days to make my offgrid system to perform an equalization charge on my OPZS batteries. I am now almost absolutely certain that my system will never manage to perform it properly unless Victron makes changes to the process. To be more specific.

I have a Multiplus 24/5000 an MPPT 150/70 (2000W panels installed) and a fronius 3.0 (5000W panels installed) on the ac out.

If I programm the MPPT to perform an automatic equalization, it will start the process after it has finished the absorption face. But as soon as the voltage increases the ac coupled Fronius dicreases its output to 0W and stops taking care of the AC loads of the house. So the MPPT power is distributed to the AC loads and what is left tries to equalize the battery. If the ac loads increase the things get even worse! The Fronius continues to give 0W an the the demand of the AC load comes from the MPPT and from the battery! So although there is plenty of solar power to manage the load and perform the equalization the fronius stays closed and the battery starts to discharge! Even if the volatge of the battery drops bellow the float voltage, the fronius stll stays closed!

If I manually start an equalization on the Multiplus together with the MPPT, thing are better, but the Fronius only gives a small percentage of the loads and does not give its full power.

If on the other hand I try to start an equalization only on the Multiplus from the CCGX, then the MPPT switches of and the fronius has to take care of the loads and the equalization at the same time.

This is very disappointing ! Practically my batteries will never equalize and they will be finally damaged.

Is there any change that Victron will improve the firmware of the Multiplus so it can take care of the loads when the MPPT is trying to equalize?

In the pictures below you can see that the MPPT is trying to cover the loads and the equalization while Fronius is closed.


Vangelis Beligiannis asked
Vangelis Beligiannis commented ·

3 Answers

Charging battery via solar controller load output?

Can a battery be connected to the "load" output of a MPPT 75-15? Will it damage anything?

I wish to charge a second lithium bms protected battery when the primary mppt 75-15 charge voltage gets to near full battery voltage. I would let the secondary battery bms control charging it's battery. I'm trying not to us an Orion or other dc/dc converter. I searched but didn't find a definitive answer. Thanks.

7caper asked
7caper commented ·

2 Answers

Is it possible to use shore power as input for a SmartSolar MPPT charge controller to charge 12V AGM battery?

Hi All,

I am designing my electrics for my van. There is already a 230V AC, shore power, network in my van. I would like to add a 12V circuit for off-grid circumstances, for charging laptop, running lights and a fridge. I would like to mainly charge this battery with 200/300W solar power via the SmartSolar MPPT XX/XX charge controller. But I think it would be beneficial to also be able to charge it via shore power if solar power is no option. Would it be possible and safe to charge the 12V battery (AGM Deep Cycle 250Ah) using a laptop charger plugged in my 230V AC network connected to the SmartSolar MPPT XX/XX charge controller? I would add a breaker between my solar panel and SmartSolar controller and solder a plug on my old laptop charger to easily connect it. This way I don't have to buy a separate 230/12V charger.

Thank you for your help and advice!

laurent444 asked
laurent444 answered ·

2 Answers

Does the MultiPlus 3 kVA Inverter/Charger allow me to set an upper limit on the wattage?

I am considering the "MultiPlus 3 kVA Inverter/Charger" for my van build.

Due to battery constraints, what I really want is a 2.5-2.7 kVA inverter.

Is it possible to limit this inverter to something less than 3kVA? A setting that can be modified?

The other inverter I am considering, a Xantrex, does support this. ("Inverter Output Power Limit" - "The wattage setting value can be adjusted by 100-watt increments. Use with Inverter Output Power Limit Timer especially when pairing with a lithium ion battery. 0.1 is equivalent to 100 watts.").

I looked all through the Victron manual, but did not see anything about this.

I was hoping to go all-Victron, but this might preclude that.


cw8 asked
tozz commented ·

4 Answers

Prioritise PV from MPPT over Grid power

I have a Grid-Tied Quattro 48/15000 with 860 Ah of battery power with a usable 20 kWhr .

My maximum allowable grid usage is 5.5kW and I have a PV array of 36 panels with a peak output of 8KW.

There are two 18/250w MPPT’s attached that act as charge controllers and supply AC power when required.

It is setup as an ESS system with Self consumption (With Battery life) and DVCC disabled

The problem is that the system prioritises the Grid input over spare PV power. Therefore it is inefficient and I am paying for grid energy when spare energy is freely available from the PV/MPPT.

I am reducing grid power usage by modifying the 'Grid set point' in ESS depending on the weather and my energy requirements. Ie When I have a high demand, I set the grid to maximum and at night reduce this down to a much lower level.

Is there a way to instruct the system to use maximum PV output for AC and only use the grid to fill in any shortfalls?

The installers here in Spain do not have a lot of experience of these Victron systems and have not been that helpful in fixing these complex issues.




bradhale asked
JohnC commented ·

3 Answers

Should I upgrade to SmartSolar MPPT? (corrected)

Hello, I have an Airstream with BlueSolar MPPT + MPPT Control. If I add the Cerbo GX (which replaces the mppt controller) + a Smart Shunt, is there any benefit to upgrading from BlueSolar to SmartSolar if all devices are connected to the Cerbo via VE.Direct cables?

In other words can the smart shunt & blue solar share info via the cerbo or do they still need the ve smart network over bluetooth to share info?

oldcrowew asked
oldcrowew answered ·

3 Answers

Multiplus AC output voltage dips on load peaks


I'm having a small issue since the beginning of my (near) offgrid installation. Everytime the fridge compressor needs to start, it is very much noticeable on the lights. They flicker a little too much compared to what I wanted to be ideal.

Of course, this is expected to some degree. One must design system with a sufficient margin for the load peaks. My inverter was initially a 24/3000. I later added another one in parallel. They are fairly balanced, so I expect that now I have a system better or equal to an 24/5000. Further down the road, I improved the cabling to batteries from 50mm2 to 70mm2, and just about 1m lenght to busbar + 50cm to inverters. Even the fuse I passed from 250A to 300A to reduce resistance. Later on, I even changed to LiFEPO4 batteries (14kWh), with reduced internal resistance...

Well, even with all these improvements, although it got slightly better after each step, I never managed to remove the flicker on the lights to the extent I really wanted. In fact, I have a small impression (hope I'm wrong) that is getting slowly worse rather than better. Does anyone believe that is anything wrong with my system? Only about 3 years old. Could it be Multiplus capacitors or any other component is showing "tireness" due to the fridge constant startups all day long during the past years?

Below an example that makes the lights flicker. The voltage seems to go too low with too much ease for this kind of load. It's a ~150W fridge. I'm kinda worried. Or am I expecting too much?


Eliseu M asked
Eliseu M edited ·

0 Answers

Keep charger on or of when batteries under small load?

Dear all,

I am wondering:

Regarding what i read and hear the best to do with (in this case) AGM- deep cycle and super cycle batteries is following, in short:

- Always after use charge battery to full and after that, disconnect charger.

- If not used a fully charged battery for a period: After 1 or 2 months charge batteries again for maintenance purposes and to make sure a complete charge cycle is made.

- Do not interrupt charge when charging a fully charged battery, so do not charge batteries if not necessary and when it is not possible to finsih a complete charge cycle.

In my case:

I have a color control connected to a multiplus 12 volt, connected to 2 x 230 Ah in parallel.

The system can be monitored by the gsm module, so i have a constant network connection. Power drain in standby is around 0,2 amps due to data connection etc. When i use remote console, power drain is around 0,3-0,4 amps. So in other words: i am superslowly draining the batteries.


Do i keep the charger on or off when in standby? For my understanding, it is not very healthy to keep a charger always on whe u store batteries, even not when it has storage mode (see above for my understanding)

But in this case i am slowly draining the batteries, so is it better to leave the charger on when i am not on the boat for like 2 weeks?

For what i do now when i leave the boat:

I charge the batteries to 100 percent. I keep the color control online. After 2 weeks, the day before i go to the boat, i turn on the charger remotely.

Is this the best thing to do?

Best regards, Piet

piet-hein-van-asselen asked
Alexandra commented ·

4 Answers

MPPT 150/45TR tripping inverter with overvoltage

Here is my configuration:

four 175W HQST panels in series (Open-Circuit Voltage (Voc): 24.3V, Optimum Operating Current (Imp), 8.62A), VE MPPT 150/45TR SCC, four 12V LiFePO4 (105Ah) in parallel, Giandel 12V 2200W inverter.

I have this problem that the inverter is constantly tripping on over voltage (16V or higher). The VE 150/45 surges over 16V when cloud cover opens quickly, and the draw on the inverter drops as well. I have set up a "Battery Preset" customized for the batteries and it works fantastic. The inverter manual suggests to not use the inverter if overvoltage shut downs occur. That defeats the purpose of having solar. Any ideas?

Is there any way to limit the power spikes/surges on the controller?

repro asked
seb71 commented ·

3 Answers

Campervan Schematics


Hi All,

I have finished my first revision of the campervan schematics, I am sure I would have forgotten a few items (such as the Dometic fridge, a shower solution etc), but this is the general installation. I wanted some people to check it over and to see if everything looks legit in terms of wiring etc. I suspect the solar wattage should be enough considering I have the DC-DC charger? Also in terms of AC power, can someone advise on a suitable distribution box that will work seamlessly with the Multiplus and the correct wire sizes for this also please?

Let me know if anything looks wrong. I plan to fit what I can and get it approved by an electrician.

campervandan asked
campervandan commented ·

3 Answers

'expert mode ' bug in mppt firmware v1.46

when you go into expert mode in v1.46 , and set the maximum absorbtion time it makes no difference e.g set to one hour it still runs absorbtion for 2 + hours . next time you log into the MPPt you have to turn on expert mode again , so it looks like any changes just don't get saved.

iolaire asked
locke answered ·

3 Answers

Split combiner box feeding 2 SmartSolar mppt controllers off a common negative bus bar?

Hi, I am wondering if it is ok to use a Midnite Solar 6 breaker combiner box with the positive bus bar split in two and use it to feed two Victron SmartSolar mppt charge controllers using the common negative busbar? Each controller would receive their own positive and negative cables, only the negative busbar would be shared.

The arrays would be different sizes feeding into a Victron 150/100 and a Victron 150/70 feeding into a single battery. Midnite Solar states most charge controllers can work in this configuration with a few named exceptions (Victron not being one of them). There is a diagram similar to this setup on page 5 of this document:

I just want to make sure before I make a potentially expensive mistake! Thanks in advance for any help.

iqyax asked
iqyax commented ·

1 Answer

Doubt about Victron adapative charging algorithm
I don't understand victronenergy's adaptive algorithm well.
Victronenergy says that the absorption time should be longer with a very discharged battery and shorter with a slightly discharged battery.
But why?
whatever the previous discharge, when the battery reaches the absorption voltage, eg 14.4v, it means that it is at 80% charged.

Case 1: 100 Ah 0% battery, charged with 10 A charger. After 8 hours of bulk, it will be around 80%. And the absorption begins.

Case 2: 100 Ah 60% battery, charged with 10 A charger. After 2 hours of bulk it will be about 80%, so as in case 1. And absorption begins.

Why, according to the victronenergy algorithm, must the absorption of case 1 last 8 hours, while the absorption of case 2 must last 2 hours?
Why,if both batteries are about 80% charged when absorption starts?

According to electrical physics, providing a constant current of 10 amperes, any battery, at any level of discharge, will have the same level of charge when the absorption voltage is reached. That is about 80%.

francesco asked
francesco commented ·

2 Answers

Can i connect 2 panels at 75/15 MPPT controller?

I bought today on our local store ( AkkuPojat ) the bluesolar 75/15 solar charge controller.

I did said I will connect on future 2x150W (18v) panels to it and the vendor say don't do that it will kill/damage the charge controller. is this true the victron has no limitations on output current at 15A ? the vendor said don't do that, it has no protection.

I have 1x150W panel on my van (future reservation for 2x150W) and i don't need bigger controller, i want to compensate only for cloudy days, as now 150w is more than enough for what i run.
I do have now Chinese epever there, but that have cloud and RFI (I'm ham radio user) issues, so decided to go for victron and try that.

So question is, will the victron MPPT chager kill/blow/brake/explode if i not exceed the voltages and short circuit ratings? and yes i am an electrician, so i know what I'm talking about, just asking does 15A limitation work on this device or not? I really hope our dealer won't provide false information as they are victron importer.

riku asked
justmurph answered ·

4 Answers

Blue solar MPPT 150/70 with lithium

Hello, I recently upgraded from 12v SLA Batteries to 12v LifePo4 batteries from

My question: Is there a software/firmware upgrade that will allow me to select a lithium charging profile on the MPPT 150/70 so the lithium batteries are charged properly? Looks like the newer "smart solar" MPPT have a lithium profile.

Right now I have setup a "custom" charge profile that has absorb @ 14.4v and float @ 13.6v, no equalize. There is no option for bulk.

Thank you!

iron-quail-ranch asked
klim8skeptic answered ·

3 Answers

SmartSolar MPPT 150/85 VE.Can - No current flow in Bulk with PV at VOC

I have a SmartSolar MPPT 150/85 VE.Can connected to 6 320W Renogy solar panels wired in 2 parallel series of 3 panels on an RV. I have 15A fuses on each string and a 25A circuit breaker in between the fuses and the MPPT charger. The new system has worked fine for weeks, until one morning after a day of the charger being in float mode for most of the day, both 15A fuses were blown, but the 25A breaker was not tripped. I also noticed that the charger said that the PV Array voltage was within a volt of the battery bank when the array was actually at 0V and/or completely disconnected.


After replacing the fuses, the charger seemed to work for the rest of the day. By the next day, one of the 15A fuses was blown. Part way through the following day, the charger stopped charging altogether even though no fuses were blown or circuit breakers tripped.


Now, when the charger is in bulk mode during the day, it reports the battery voltage and PV array voltage but no (<5W) of actual charging, At night, it still reports a PV array voltage of approximately the battery bank voltage.


warren-b asked

0 Answers

Smart Solar MPPT RS 450-Isolation between PV and Battery

Good morning, does the new Victron 450V /100 and 200A MPPT(s) provide Galvanic Isolation between the PV input and battery output terminals.

red-dirt asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

Tail current on Blue Solar MPPT 100/50

My configuration:

Fixed absorption time: 1 hour

Tail current: 6 Amps

I thought / have learnt that the MPPT should only svitch from absorption to float before the 1 hour fixed absorption time if the charge current dropped below the tail current setting BECAUSE THE BATTERY IS ALMOST FULL, not because of a cloud/low in-Power to the MPPT

In other Words: I thought the effect of setting a tail current only "kicked in" due to battery conditions, not PV conditions

But yesterday I experienced something different:

The MPPT was i absorption, still charging With about 18 Amps into the battery. Suddenly the sun conditions got worse, so the charge current dropped below 6 Amps beacuse of that.

- Then the MPPT switched to float, even if the 1 hour fixed absorption time was not yet reached, and even if a full battery was not the reason for charge drop below 6 amps.

Is this normal? This is not how I thought it should be...

thomassolar asked
francesco commented ·

1 Answer

ON/Off Grid use case


Working on proof of concept for our exhibition trailer.


Normally undertake a number of outdoor exhibitions, as these are starting again looking to a hybrid energy solution as a lot of venues a actively banning use of generators so either use provided EHU or go to alternate energy.

Using the following as a use case

Kit includes

  • 100/50 MPPT
  • 200W Solar arrays
  • Smart Shunt 500
  • Smart Battery Protect
  • Phoenix Inverter 800
  • Orion TR 12/12/30 Isolated
  • Venus

Question is around grounding.

Phoenix in the above use case is bonded to the -ve busbar I am assuming the bus bar is also grounded to the chassis to EHU power

I'm assuming the 375/800 has the earth connected to the N of the AC output by the internal jumper.


southsideph asked

0 Answers

Mppt 75/10 Bluetooth solar controller cannot connect Bluetooth

I have installed my solar controller and connected successfully. I have accessed via android and iPad successfully for a year or so.

however, I have a new iPad and android phone and when I tried to connect it gets to 80% asks for the pin 000000 but fails to connect.

when I try to connect the unit flashes rather yellow and blue lights then fails to connect.

I have disconnected the unit from solar and battery and reconnected with no success. I have removed the victron program and reloaded with no success.

btw. I has similar problems with my battery monitor bur solved by disconnecting and reconnecting So I can confirm my iPad and android phone are ok with victron devices

i would appreciate solutions please

no1johnkilner asked
no1johnkilner answered ·

1 Answer

VictronConnect Bulk State turns off Automatically

I have a 100 / 30 MPPT and I have three 200 watt solar panels attached and the bulk state turns off automatically.. I heard if the solar voltage goes below 5V higher than the Battery Voltage it automatically turns off.. why would this be the case? Why would the voltage drop and the bulk automatically turn off which stops my solar panels from charging. This doesn’t make any sense. If anyone can help me figure out how to fix this problem? Thank you

Tyler asked
Tyler answered ·

2 Answers

VictronConnect Controller Bulk turns to Off automically

I plug my solar panels in everyday. I open the app and the Bluetooth loads and shows my solar panels getting watts of power. Then all of a sudden the watts drop to zero and the battery state flips to off and then back to bulk and then the watts go back up. Then the bulk switches to off automatically again and goes to zero.. don’t know why it does this but after about 30 minutes it starts working without flipping the bulk to off automatically.. thanks for the help

Tyler asked
Tyler answered ·

2 Answers

SmartSolar Temperature Compensation changes voltage in the wrong direction

Hi all,

i'am using a SmartSolar MPPT 100/30 with firmware 1.54 and a external temperature sensor.

When setting the temp. compensation to -30mV, on temperature below 25c, in my case 18c, the voltage is lowered from 29,4V to ~29,25V instead of 29,55V.

When setting the compensation to 30mV (plus) it works as expected.

Is this a bug?

Thanks so far


Marco Meile asked
wanek answered ·

4 Answers

Victron SmartSolar MPPT 20A 100V - setup questions

Hi All,

I am relatively new to campervan setups, and I do not have a background in 12v electrics.

I have had a Victron Smart Solar 20A 100V MPPT installed in my campervan together with a new leisure battery, which I am really pleased with on first inspection.

There are a number of options in the Victron Connect app to allow configuration of the Smart Solar 20A 100V MPPT, here are the settings I am talking about.


It looks like most of the settings (Charge Voltages etc.) are set by either selecting a Battery Preset (see options below), or by selecting "expert mode" and specifying your own numbers for the Charge Voltages. The "factory default" seems to be the Gel Victron Deep Discharge option.

The other Battery Preset options available are:



It says in the manual to ensure the settings match your specific leisure battery, and this is where I am struggling - I cannot seem to locate the information needed. The leisure battery installed is a 12V 110AH Xtreme AGM Leisure Battery (XR1750) NCC Class A.

So, my question are:

  1. Are the Factory Default settings ok for my specific battery? Or should I change them?
  2. If I need to change them, then:
    1. Should I pick another pre-set, if so which one?
    2. Or, should I use expert mode and set the Charge Voltages manually? And if I do, what numbers should I use?

A final (less important question) also

  1. What does the "equalisation stuff" do, and do I need to worry about it?

Thanks everyone!

monstreruk asked
tibo-huyers answered ·

2 Answers

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