dc system Image

dc system

Looking to add 3 lithium batteries to my lead acid system. One or two dc-dc chargers?

Hello I currently have a set of lead acids charged by solar panels. Im trying to add in a set of lithiums to the array. Does anyone know if dc-dc chargers only work one way? Or perhaps I need two? The idea is to have two different chemistries and be able to charge and use them at the same time without needing to switch manually.

burgboy asked
kevgermany answered ·

2 Answers

GX Touch 50 shutsdown/reboots when switching on/off a certain breaker

Hi all, i have a GX Touch 50 hooked up to a cerbo. The Cerb power leads are connected to the primary DC service switch - connected to the side from the batteries so the switch does NOT interrupt the power to the Cerbo.

It isn't 100% of the time, but it happens maybe 20-30% of the time when i switch the breaker on my DC panel for my USB outlets(the most common switch i switch on/off), my Touch 50 will shut down and reboot. I dont believe the cerbo is actually shutting down but being it is in a different location, i can't fully confirm this but i dont seem to get disconnected when connected via bluetooth. I"ve gone through all the connections and everything is tight as should be.

Anyone have an idea on whats going on? Just an annoying thing thats occurring at least 1-3 times a day

jordan-de-geus asked
gary-3 answered ·

3 Answers

Wiring help Truck with 48v system Questions

1. What fuses or breakers do i need and where?

2. Is the wiring right or does something need to be moved or added?

3. Shunts, Cerbo GX, etc needed?

4. Lynx 1000 needed?

5. This will be completely off grid

6. Is MPPT needed for EasySolar 2 GX?

7. Winch straight to battery or connected to paralleled Orion-Tr’s?


Updated down below



lpez210 asked
lpez210 edited ·

4 Answers

MPPT Output Under Load

I've noticed that many times when it's nice and sunny and the batteries are fully charged if I turn on a heavy load the 100/30 MPPT won't provide any current from the solar panel until the batteries are significantly discharged, sometimes not even then. Sometimes it will only start providing current the next day. Why doesn't the MPPT always respond to load on the system by outputing current form the solar panel?

robert-barnesi asked
robert-barnesi commented ·

1 Answer

Metering Overall DC Loads (and Excluding Sources) When System Includes a Third Party Inverter/Charger?

Disclaimer: While I am somewhat experienced in the area of off-grid electrical systems, I have yet to have any hands-on experience with Victron's products, so the following question comes from the perspective of someone who has only been able to read the datasheets and manuals.


A friend of mine is tired of having to run the noisy fuel-guzzling generator every day to recharge the battery bank on his 49 ft sailboat. Instead of incrementally installing random PV panels until the problem goes away, he wants to first install equipment for recording his DC usage this cruising season so that he can determine his real-world requirements and design a system that balances the desire for extra capacity against seaworthiness concerns and aesthetic considerations.

The plan is to meter the loads downstream of any charging equipment, so as to not have the data obscured when the "service"/"house" battery bank is being charged, such as when motor-sailing or running the generator. For typical DC loads, this is fairly straightforward, and Victron's SmartShunt product in "DC energy meter" mode looks like a good option. If combined with one of Victron's "GX" products, I gather there is even the option of taking the sum of the values from multiple SmartShunts in "DC System" mode, which would be convenient if my friend later decides that he wants to get collect data on individual system branches while still seeing/recording his overall energy use.

The main complicating factor is his third party inverter/charger, which can either be a DC load or a DC source, depending on whether or not he's got the generator running (or is connected to shore power). Short of replacing the inverter/charger with discrete devices, I can think of a few approaches to this issue, some of which are better than others, but none of which seem ideal:

  • We could install a single SmartShunt downstream of the inverter/charger, but then we'll fail to account for all of the DC that goes into supporting AC devices via the inverter.

  • We could install parallel SmarShunts (one for the inverter/charger and one for everything else), but then I would imagine our "DC System" readings in the GX software will be thrown off whenever the inverter/charger is in charging mode.
    • A less-than-complete workaround here would be to suppress/zero-out the readings from the inverter/charger's SmartShunt whenever the inverter/charger is acting as a source. Is there a way to do this in the GX software? If not, has anyone achieved this by using a high-current relay/contactor to bypass the SmartShunt and short the inverter/charger's DC- connection directly to the upstream DC- bus? (I'm imagining an AC relay/contactor that is activated whenever generator/shorepower is live.)

    • I have characterized the workaround discussed in the previous sub-point as less-than-complete because it fails to allow us to take into account for what the DC inverter's consumption would have hypothetically been if generator had never been switched on. Does anyone have a solution here? Does Victron have a standalone GX-compatible AC current sensor that we could use to record the load on the third-party inverter/charger's AC output at times when it is in AC bypass mode due to generator/shorepower (and only at those times)? The idea would be to convert use the data for these periods into estimations of what our inverter/charger's DC use would have been had the generator/shorepower not been online, taking into account the inverter's conversion loss.

Thanks in advance for any solutions!

aaron508 asked

0 Answers

Multiplus 12/3000/120 not inverting on battery power

Have scoured the forums but no solution found. I am in the process of mocking up the system for my camper and for a week or so, the Multiplus operated just fine. However a few days ago, nothing works when on DC. No inverter, no unit power on when connected to a fully charged (13.37V) battery via 4/0 cables and voltage checked at the studs on the Multiplus.

When connected to shore power, normal startup works fine, after a few moments the mains LED lights up and battery charging working fine.

Checked everything, started clean by updating the firmware via Victron Connect (current firmware is v494). Still no lights...nothing when AC is removed and cannot connect via VC when Multiplus is solely on DC power. There are no modifications in configuration other than selecting Lithium batteries, and yes the battery voltage for inverter shutdown is set at 11.4V. I am at a loss, all assistance greatly appreciated.

john-gibson asked
john-gibson answered ·

7 Answers

Will the Fuse LEDs on Lynx Distributor illuminate without the 4-pin cable supplied with unit?

Trying to use the Lynx Distributor (and Power In) without the Lynx Ion Shunt or BMS (using BYD batteries). I had assumed the Fuse LEDs would illuminate with a working fuse in place and powered, however a line on the old Victron Live page for DC Distribution Systems suggests that this small data cable is used to power the LEDs (rather than taking power from the busbar itself). I cannot get the LEDs to illuminate - are the LEDs useless unless using the Lynx Shunt? Because Lynx Shunt uses CANbus, it cannot be used in conjunction with BYD on a CCGX (though I think VGX would support it).

midsummerenergy asked
teddysx3 edited ·

6 Answers

Use smartsolar as a dc dc converter

Hi there

Here's the situation : I have an electric vehicle with 72v batteries inside. What would happen if I disconnect my solar panels from the 250 / 60 smartsolar and plug the 72v instead ?! I guess it's gonna work like a dc dc step down charger with my 56.8v lifepo4 battery !!!???!!!

And what would happen if this 72vdc battery is plugged IN PARRALLEL with 220vdc solar panels (6 trina vertex 400 in series) to the smartsolar's PV input ?

Even weirder : the fact is that my 72vdc vehicle can be directly charged by a 54vdc voltage. So how fried am I if I have PV + 72v battery on the smartsolar pv input... + my EV controller (not directly the 72v battery, this controller charges through the motor used as an induction) on the smartsolar's 48v battery output ?!?!?!?

Of course I see some diodes, fuses etc potentially added but let's discuss the questions above first, please.

I imagine a situation in winter when I don't move from home and would be happy to reduce daily manipulations on the system. The other huge advantage would be that my vehicle can be used to charge 10kWh outside of my offgrid facility and come back to feed my system in case of super bad weather. Big battery on wheels !

csc asked
Alexandra commented ·

9 Answers

Cerbo GX Current Consumption

Hi, I am looking for current consumption of Cerbo GX @ 12VDC. For comparison, the Venus GX is listed at 210mA at 12VDC in the manual. Cerbo does not list any power consumption in the manual.

I would like to install on a boat mainly to link my MPPT via Wifi to the VRM website, but am concerned that the current consumption will drain batteries too much. I will be using 2x 50W panels, but would like them to primarily charge the batteries.

pyro asked
stourel answered ·

8 Answers

HowTo PV Charger priority over Quattro Charger

A non-ESS hybrid connected to the grid with Quattro mode "on" will throttle down the PV charger and charge the battery from grid...


when, by putting the Quattros into "inverter only" mode, the PV charger could actually deliver the charge. Or at least any charge so it would not be needed from grid:


Obviously, the question is how to achieve PV charger priority over Quattro charger priority, so one could leave the grid on, but not at the expense of PV chargers being turned down, which IMHO should have been the default in the limbic (non-assistant) system of Victron devices anyway.

petajoule asked
petajoule commented ·

2 Answers

DC watts increase with increased PV watts

I have a RV with a MultiPlus 12/3000/120-50 120V VE.Bus (UL) , Cerbo GX, SmartSolar MPPT 150/100-TR VE.CAN 12/24 volt, and a BMV-712 Smart Monitor.

Everything seems to be working more or less ok, but when my panels start going up in watts, so does the DC power. I have confirmed multiple times there is nothing in the RV pulling this load up, so my guess is somehow the system is reading the incoming PV charge as load. Any ideas on why this might be occurring?


Jerry Mitchell asked
kevgermany commented ·

1 Answer

When BMS Switch DC off and grid is available, why Multiplus Switch off the Full House (AC)?

I still cannot understand, why Victron switch off the AC Output, if the Batterie has problem, but still the Grid is available?
My full house is connected to an 3-Phase system and the full house run over the 3 Multiplus. If the DC Bus has some Problem, the full House will switch off because of the Voltage Ripple or Voltage minimum. This can happen at the beginning of an system to see how it works with the batteries!

So maybe BMS will switch off the DC Voltage!
BUT if there is an AC Input available, why the Multiplus cannot switch to the AC-Mode and just switch to the passthrough mode?

So house is off in this situation and grid is available make no sense for me!

Thank you!

Best regards

kevstone122 asked
shaneyake commented ·

3 Answers

DC/DC converter to battery

Hi, i'm developing a full electric propulsion plant for an e-boat (scheme in the image attached).

I have a doubt: i'm gonna use a 12V service battery to power on board hotels, feeding the service battery with current with voltage scaled by the DC/DC converter (the Victron Energy Orion Tr-48/12-9, as you can see in the scheme). The problem is that the DC/DC converter could continue to feed the battery even when the battery is fully charged, leading to overcharge and its dangerous consequences. How could i solve this problem?


antonio-gioioso asked
antonio-gioioso commented ·

1 Answer

Low battery warning


so I have everything wired to this system, with the dc/dc hookup, mppt solar, 3000 multi plus. And 300ah of lithium battery. when I disconnect my batteries I’m still getting 12 throughout my system, yes the break in the line is to the batteries. Also the victron multi plus keeps showing low voltage. Even when we are in the sun with the solar system charging. What am I doing wrong and how can this be fixed?

carterkemppel asked
jengstro answered ·

4 Answers

How to measure two DC Inputs On CCGX

I am looking to install a Victron system on my RV that will be using a third-party DC-DC charger to charge 48v house batteries from the vehicle's 12v alternator. If I were to connect this charger through a dedicated BMV battery monitor (with a second one for the system's DC loads), is there any way to have one show up as an "alternator" input on the CCGX display screen?

I know I could connect it through the BMV-700 and presumably just have the CCGX show it as power flowing from the "DC loads" box to the battery. My primary concern is ease-of-use for the end user, so I would greatly appreciate any way to configure thte CCGX for this display.

chase-martin asked
leedyson1 commented ·

4 Answers


116 Posts
112 Users
1 Follower

Topic Experts

9 Points
0 Points
Franz Voelkl
0 Points