Can I use 24 volt solar panels to charge 12 volt batteries through MPPT Controller

I’m trying to spec a system using all Victron kit and looking at the 100/30 MPPT charge controller. Does that controller accept 24 volts from solar panels and charge 12 volt batteries?


SteveCounsell asked
avs_power answered ·

2 Answers



Wind Turbines and victron charge controllers

hi, i would like to know if victron mppt charge controllers support wind turbines? if yes could i run 2 controllers in parallel, one with solar and one with a wind turbine?



lief ryan asked
houser commented ·

10 Answers



100/30 wiring diagram

I brought the 100/30 mppt charge controller wanting a full wiring diagram picture how to wire it up as I'm not sure. solar panels to unit to battery and do I need to put a fuse or circuit breaker somewhere what size if I do any help would be great thanks I have 1 300w solar panel and two 12v batteries

donkeydave1980 asked
Guy Stewart (Victron Community Manager) commented ·

2 Answers

Tesla Model S battery + Multiplus = Can not turn on inverter below 50% SOC.

Anyone else using a Tesla battery? I'm surprised to find that I can not turn on my inverter below 21.8V. Do I have to return this inverter?

The tesla battery is supposed to be 20% SOC at 19V, 100% SOC at 25V. Please help me utilize my full battery. Thanks.


rockatron asked
Tom commented ·

17 Answers

Mixing lead acid and lithium

My Lead Acid OPzS battery bank is "becoming smaller" as I continue to load the system more an more. Initially I sized the system for 20% DoD, but now in next winter I am afraid it may reach 40 to 50% or even more.

I have now the chance to get a good priced set of Winston LiFePO4 90Ah cells and I was thinking to build a smaller independent system to offload some of the work of the main system.

I allways thought it would be not advisable to put lithium in parallel with lead acid, but the more I think of it, the less crazy it seems. My LA system is 24V based, the 8 cell Winston would be 25.6V nominal. I would source a 3rd party BMS to manage the lithium. Maybe the BMS can take care of the issues - disconnect in low and high side of the daily swings.

I actually have found a product to make hybrid battery banks (BOS - LE300) so maybe this isn't so crazy after all.

To install in parallel and monitor the 2 strings I was thinking if it would be possible to use a separate BMV on each string (Lithium and OPZS). Is this possible, using 2 BMVs on same Venus device?

Elimac asked
Alistair Warburton answered ·

6 Answers

MPPT 100/20 Lithium Battery Configuration

Hi, I've just connected a SmartSolar MPPT 100/20 (version 1.37 firmware) to a 12v 100AH Lithium Battery and can not find a battery setting to use.

I only have 4 presets (AGM spirel cell, Gel Victron deep discharge(1), Gel Victron deep discharge(2), & Gel Victrol long life (OPzV)

I have the latest Apple IOS, the latest IOS Victron app and connect via Bluetooth . I normally charge the battery from 240V AC with a Victron BlueSmart 30A charger set to Lithium with no problems

Greg asked
thanar edited ·

6 Answers

Can I use an MPPT as a dc to dc charger for an alternator?

Can I use my MPPT 75/15 solar controller as a dc/dc charger to charge from my alternator to my secondary deep cycle battery in my 4x4?

Luke Rossi asked
BenL commented ·

7 Answers

Connecting a charger to Load (Out) side of a BatteryProtect


I have two questions:

  1. is a BatteryProtect able to handle reverse current when connected as shown below in case of the BP220? Reverse current would be up to 30A while charging, and Vout >Vin.
  2. In case 1. is possible, let's now now assume the BP220 disconnects due to cell under voltage ( and thus BMS Load Disconnect output being set free floating). When connecting the charger (14.2 or 14.4V) thereafter, what would the voltage drop between Vout and Vin be? Can the BP220 handle 30A reverse current in that case, up to the point when it connects again after 30sec?

Note: the design intent of the layout below is to protect the SmartLithium battery from standby current drawn by the charger in case of cell under voltage. With the original design from the manual, this could only be achieved by a main switch (or pulling the fuse) between battery+ and BP. I cannot use a Cyrix-Li-Charge because my charger applies a IU1oU2oU3 charging characteristic with U3 being below the Cyrix-Li-Charge 13.7V engagement level.


Image: BatteryProtect Manual figure 5, modified (second BP out connected to 1st BP out instead of 1st BP in as in original diagram).



stefan.cs asked
offhighwayvan commented ·

12 Answers

Installing the Multiplus 3000

With a 50 amp electrical system in my RV, I'd like to install a Multiplus 3000 inverter/charger. I have three Battle Born LiPO4 batteries in parallel. My shore power is a 4-wire and there are two legs on the distribution panel. One of the companies that sells Victron adds a "Smart Phase Selector" in their 50 Amp RV upgrade. Can I install the Multiplus 3000 without this added device?Will the inverter/charger work in this regard?

cgjog182 asked
Tom answered ·

5 Answers

Victron Community Guidelines

Hello and Welcome!

These are some of the Victron Community guidelines. The community is predominantly volunteers, and the vast majority of the answers are provided by enthusiasts. It is not an Official Ask Victron site, for that please use the normal line of support.

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There you can find an active enthusiast community who are looking to make the most of their systems and expand their own knowledge and control beyond the bounds of what most normal users and installers expect (a nice stable and reliable power system).


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This is a public community and anybody is able to contribute. Please use the normal channel of support if you are unsure of how to proceed, or wish to escalate an enquiry.

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PS - I also welcome any suggestions you might have. This is a live document, so there will be changes:

Guy Stewart (Victron Community Manager) asked
Guy Stewart (Victron Community Manager) answered ·

9 Answers

Why is my maximum State of Charge (SOC) stuck at 85%?

The Problem: SOC from the inbuilt battery monitor never goes above 85%, climbing down from 100% at installation. (I think the rotary switch is set to Position 1 battery type - flooded.)

Here's my offgrid setup, installed 2 weeks ago:

PV Panels: 15 Jinko 270w panels in 5 strings of three (in series)

Inverter/Charge controller: Victron EasySolar 48/5000/70-100 MPPT 150/100 Color Control

Batteries: 16 Trojan T105 flooded cell (2 banks of 8 x 6v in parallel) with combined 20 hour capacity of 450ah, or 10 hour capacity of 414ah

Any advice greatly appreciated. Thanks!

John Berger asked
Elimac answered ·

3 Answers

Official Depth Of Discharge Recommendations For LiFePO4

Having recently had a 4 x 100 Ah LiFePO4 system installed, I am finding hard to shake off the habits learned from a crappy lead acid system & allowing the state of charge to dip to 50% goes against the instincts learned from past experiences.

What am I safe to use out of these batteries?

Lots of hearsay, not too many hard facts.

Dave asked
Murph commented ·

4 Answers

What should I set Lithium Battery Absorption Time to?

They say that Lithium batteries don't need to be charged in absoption mode. I've heard that when charging Lithium you should go from Bulk straight to Float. Will setting the absorption time to zero achieve this? What about setting the absoption voltage to a really low voltage that is never achievable? What do others on this forum know of this? What settings do others use when charging their caravan Lithium battery? MPPT Bluesolar 100/30, Sentry 300AH Lithium, 300W solar.

RedRover asked
Evanjs commented ·

5 Answers

Why doesn't the documentation warn that multiple MPPT controllers don't play well together and is there a fix in the works?

I've got a 12v 320Ah Narada Lead Carbon battery bank, a Multiplus 1200/12/50 and 3 SmartSolar MPPT 75/15's connected to 3 separate solar arrays.

The problem I'm having is the MPPT controllers tripping over each other going into float WAY too early. So on the daily chart I'll have one controller yielding as much as 1300Wh while the other two will yield as little as 200Wh each. At the end of the day the battery is not fully charged either.

The dominant controller can be any of the controllers on any given day. The wiring and settings are the same for all three controllers. I guess it just a software race condition which one detects the 1A float first. As soon as is does that 1A load goes to the remain controllers.

Is it possible to have them share better. Does the BMV or Smart Sense Synchronise them at all. As it is they are operating at about 30% efficiency once two drop out.

Seems that only one MPPT controller can be the only charge source in the circuit. Otherwise once any one hits the 1A float threshold it go to sleep and doesn't wake up again. Leaving just one controller to do all the work and the battery no where near charged.

The situation is exacerbated as the Muliplus charger starts up when the generator is fired up. All the MPPT go to sleep because the generator is providing all the charge current. Then when it is turned off often only one charge controller comes back to charge and the other two stay on float even though the battery might only be 30% charged because the float voltage being reached does not wake them all up.

These MPPT charge controllers do not play at all well with other charge sources. Including their own kind. Is there any way to have them act as a simple power supply? That is just providing a voltage to battery and allowing the battery to simply absorb what it can? Or maybe get rid of the 1A threshold or have a timer that checks periodically if the battery can now accept greater than 1A and go back to absorption.

Basically modify the algorithm somehow so they're get back to work when they can. At the moment it's like having an employee that gets things done in the morning then goes to sleep and doesn't bother checking if more work has arrived because the other bloke is doing it all by himself and struggling at it as a result.

Seems theses things are too smart for their own goodand as a result are constantly tripping over each other. After which they don't get up and back to work again for the rest of the day! If it was an employee you'd fire them for not being team players! Lol

Is it possible for me to just move the charge leads from the battery connector to the output connector? If the MPPT can output 15A at say the float setpoint voltage to the output without a battery in the battery connection then that would be better charge controller than all the current "smarts" before the battery connection terminals!

Any solution would be appreciated.



Troy asked
wolfandy commented ·

7 Answers

What is the password to edit VE.Bus MultiPlus settings on VictronConnect?

MK3 multiplus v5.8beta1., mac os VictronConnect. password ?

foto asked
warwick commented ·

2 Answers

Battery to Battery Charging.

I Have a Motorhome 12V system (2 x AGM 110AH) with 100W Solar via MPPT 75/15, Mains hookup Amperor 3 stage charger and a VSR split charge from the crank battery with standard alternator. There is also a BMV 700 & Venus GX. I am looking at ways to prolong the life cycle of the batteries after the current batteries lasted only one season. I have identified that the VSR split charge is a crude method of charging and could be improved with a battery to battery charge system. There are plenty on the market but I would prefer to use Victron products. I have found a Victron Energy Orion 7-35/12-3 Buck-Boost regulator that looks to be something like what I need but am unsure if it will give a charge quality comparable to say a Sterling Power 4 Stage Battery to Battery charger. I would be grateful for any advice or recommendations on the system and suitable products. Any tips on system setup improvements would also be appreciated. Thanks in advance.

Paulio asked
mikedefieslife commented ·

13 Answers

AGM Battery Charge Settings

I have Victron SmartSolar MPPT 150/60-tr charge controllers connected to 6 West Marine AGM batteries (group 31, 105 amp hr) for a total of 630 amp hrs and was wondering what the charge settings would be on the controller. I noticed there isn't preset settings in the VictronConnect app.

Raymanak asked
Mark commented ·

1 Answer

Will the MPPT 75/15 smart solar handle 2, 100 watt 12v panels in parallel?

I ran the math with the max panel voltage of 18.4v and a 25% safety margin and it looks like it should be okay. I wanted to get real world input. My RV forum is saying I should run a 30 amp controller to handle 2, 100 watt panels in parallel. One will be fixed on the roof, and I'll eventually buy a portable to hook up to it.

zimm asked
Esteban commented ·

19 Answers

BMV Charge status still 100%. Voltage down to 12.3V

I have a BMV connected to GX. There is a steady draw from the batteries which is dropping the voltage slowly but not registering on the state of charge. The state of charge works when under heavy load. Is there a reason for this please as at 12.3V I would expect less than 100%. The full charge settings are correct and I have performed a factory reset.

Paulio asked
NeverForever commented ·

9 Answers

How do I know when my battery is fully charged? How does the MPPT know?

I have an Victron 150/45TR MPPT charge controller being fed by 600 watts of Renogy panels wired in series.

This is hooked up to two, wires in parallel Renogy 170ah lithium ion batteries.

According to their spec sheet they are "recommended" to be charged to 14.6 volts. I don't want to do that and would prefer charging to 14.2

Looking at the spec sheet, Renogy says the following.

Standard Charge shall consist of charging at 0.2C constant current rate until the battery reaches 14.6V. The battery shall then be charged at a constant voltage of 14.6V while tapering the charge current. Charging will terminate when the charging current has tapered to a 0.02CA. Charge Time is approximately b7 hours. Safe Charging consists of temperatures between 32 ºF and 113 ºF.

Does the battery stop accepting charge from the MPPT once the current has tapered? Does the MPPT know when to stop charging the battery? How do I know when these are full? How does the system know when these are full?

Lastly, what should my absorption voltage and time be? How about the float voltage? Battery University says these batteries should really just be charged in bulk phase to ~90 or 95% capacity and then turn off charging. What does the MPPT aim to charge these at during bulk phase? That doesn't seem to be a setting I can adjust.

Sorry for so many questions, this I am new to all this.

Thanks in advance!

Evanjs asked
Evanjs commented ·

4 Answers

Comparing BMV 700-702-712

Does anyone know if there is a comparison paper or chart for the BMV lineup? After getting the Raspberry Pi working with my current Victron Controllers I am considering switching from a Bogart Trimetric to the BMV to have that info included in VRM too. I guess hearing that should make Victron happy...


bigbillsd asked
bigbillsd answered ·

4 Answers

MPPT Load output switches off

Hi There

I have an issue on my SmartSolar MPPT 75/15 Charger controller, When the controller is in the "Float" state , The national luna DC fridge i have connected to the load output on the controller seems to "trip" and then comes back on and the fridge will run , Then when the compressor turns off and then back on again the same happens again and again while in the " Float" State.

But when the solar charger is charging the Battery in " Bulk" or "Adsorption" states the fridge runs no problem , The compressors can start and stop all day with no Issues , The issue only arises when the system is in the " Float" stage.

Why does it only happen when the charger is in the "Float" state ?

I Bought the SmartSoalar 75/15 Controller so i could track my consumption and Solar output.

but now seems i have wasted my money on this controller if i cant run my fridge on it . I need the solar controller to manage the load to make sure the fridge doesn't drain the battery to far during the evening

Install Detail

2 x 100 Watt Solar panels in Parallel

1 x 105 AH Royal 1150K Battery

1 x National Luna fridge / Freezer

SmartSolar MPPT Charge Controller

Justin asked commented ·

15 Answers

Visio stencils for Victron products

Hi all, does any body know if Victron have made stencils for Visio for their Victron Products?

Or if any body else made it and made it free to use.

It makes lite so much easier when making my schematics.


vetobus asked
jokerone commented ·

13 Answers

How many MPPTs can I connect in Parallel?

How many 100/30 mppt could I put in parallel to charge the same battery bank?


djibi asked
debug commented ·

3 Answers

Can I use the MPPT to Dump Load?

do the victron mppt charge controllers have a dump load option?

lief ryan asked
Ian Hamilton answered ·

11 Answers

Max discharge current for AGM Battery bank

Hi All

I have a 6ooAh AGM batt bank on a sailing boat (3 x 200Ah)

What is the max safe current drain for said bank, especially with longevity in mind?


I have a 1,6kW 230V AC watermaker and would like to run it off the batt bank through an inverter for about 30min at a time. (and some other power tools on the odd occasion)

I do have a generator so that watermaker can be run for longer periods but for 30min (making 50L of water), it would be very convenient to not use the generator, not to mention saving petrol, fumes, and noise.

I have 640W solar and 300W wind gen which should be more than enough to deal with the discharge, I believe, on a sunny day.

So, is there a rule of thumb for a max safe discharge current for (AGM in my case) Lead Acid Batteries?

My gut feeling is that 300A for an hour on a 600Ah bank should be safe. But then my 2nd gut will freak out when it sees 200A of discharge on the BMV.. Even 100A is a hell of a lot in my mind.


Christo asked
Bill Nichols edited ·

7 Answers

100/50 to battery wire sizing?

Hi everyone. I have 2x Sunpower E-20 327w solar panels that i'm going to install. The output of these panels is shown in the image below:


Now, my question is about wire sizing. I will use 6AWG from the panels to the Victron 100/50 smart solar controller which will be within 3' of the batteries. 6AWG is good for 37amps effective use current, so that should be more than enough for the approx 20' fun from the panels to the controller (i'm open to other suggestions on wire size if you have advice).

My biggest concern is wiring size from the controller to the batteries. The 100/50 MPPT can only accept up to 6AWG (37amp wire). From my research, that can be a problem given the panels statistics. When the MPPT uses the extra voltage to create more charging amps, the amps can spike considerably on the MPPT output side to the batteries. The panels are approx 650w together, divided by 12v = 54.17amps potentially coming out of the 100/50 MPPT to the batteries. I know there are losses here and there, but it will still be way above the max current rating of 37amps for the MPPT's max wire receptacle size of 6AWG.

Feel free to blow my limited knowledge of all this out of the water. Im new to it all but the brain cells are firing on all cylinders, but I could be completely off the rails with it all.

I apologize if this sounds a little long winded or confusing....probably because I am confused! haha.

Looking forward to any and all advice, help. Thanks in advance.


Scrimma asked
Glenn Matthiesen commented ·

11 Answers

How to monitor the starter battery with my BMV-712? Wiring seems very complicated for my installation.

0 CB_Midkiff asked · Dec 10 at 4:27 PM

I have a housebank, which is charged by a Smart Solar MMPT 100/50 and connected and supervised by a BMV-712 via shunt. In addition I have a starter battery which is not connected at all to this house system. However I would like to monitor the starter battery also via the auxiliary input of the BMV-712.

Fig. 3 of the BMV-712 wiring diagram


Issue is now that the starter battery is about 5m away from the housebank and a cable connection for high loads would be quite complicated. From the BMV-712 manual I did see that normally I would have to connect the minus of the starter battery also to the shunt via a very thick load cable and an additional thin plus cable to the B2 port of the shunt.

Is there an easier way to connect and monitor the the starter battery via BMV-712?

Would it be possible to use the Smart Battery Sense device and connect it via bluetooth with the BMV-712 as an auxiliary input for monitoring the starter battery?

Tuco asked
Redbeard commented ·

3 Answers