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Battery Protect

Battery protect 100amp

To connect my battery protect I am using 35mm2 cable and 120amp fuse. Run ..25 m is this suitable

Roberthudson859@gmail.con asked
MichaelVausR commented ·

0 Answers

Charging 2 Lithium banks with MPPT


I'm looking for a way to charge my 2 lithium banks with MPPT and keep them isolated a the same time.

Here is a picture of what I have so far.

The starter has a switchable circuit to keep the Argos energise circuit live and prevent the MPPT shutting down each evening and messing with the history metrics and also give the MPPT a voltage reference when charging as I don't believe it will get one from the Argos input terminal (please confirm if I'm wrong on that). I understand that this will draw around 0.05A to have the Argo and MPPT active, which will be easily replaced by the solar charge going to the starter battery.

The 2 65A BPs are configured to lithium settings and will disconnect using the BMS charge disconnect going via the BMV relay.

This will not be an approved setup, but will it work as I've gone through serveral designs and this is the only one I haven't spotted any problems with - yet.... :)

If you have a better and supported setup for doing this I would be very interested in the details :)



stocksy asked
stocksy edited ·

0 Answers

Is BP-200 bi-directional

I'm having some issues with the system I install last summer. My converter is tripping my shore line GFI. I'm not sure yet as to the cause, but I'm hunting it down. My question; is the BP-220 bidirectional? The dealer I worked with okay'ed my drawing, but I'm thinking now there was an oversight somewhere? Due to wiring pull restrictions my converter (battery charger) output is connected to the load of the BP-200. The orange arrow is the output of my converter. I'm thinking now this isn't going to work. If the BP-200 is bidirectional it should work.


Steve asked
Steve commented ·

1 Answer

MBV 700 relay on/off/on

I installed BMW 700 customers and set it to signal me 95% charge and 95% battery discharge. Everything is set up correctly according to the operating instructions. It just doesn't work. , I set up my BMW via Victron dontge. Interestingly, according to the voltage on the battery works well according to SOC 95% does not work.
my requirements
When the battery is over 95% charged, it turns on the internal relay. If it drops below 95%, the relay switches off. this doesn't work for me on the bmv 700. please help


Miroslav Katrencik asked
WKirby answered ·

1 Answer

Battery Protect settings What is the difference between Li-ion mode and Normal? Is it simply different voltage parameters or is there more to it? In Li-ion mode, it says Shut down at 10v and Restart at 13v. I feel that might be a little low for comfort and quite a wide range, can I put it on Normal mode and set my own limits e.g. 11v shutdown and 12v restart? Or is it best set to Li-ion mode? I am using LiFePO4 batteries.

brassmonkey001 asked
nebulight edited ·

2 Answers

Positive grounding with Battery Protect

I am wondering if there are any problems when using a battery connect device (BP48/100) with a positive ground system.

I have a communications system where the battery is charged from a fully isolated and floating charger and at the DC Distribution to the comms equipment the positive feed is grounded (after the battery Protect.

example schematic below


Gadget007 asked

0 Answers

How do I use battery protect to make my 24v system work??

Hello I have a Tesla battery and have 2 battery system. I would like to be able to charge the battery and discharge it safely.

Here is my system layout I plan on building, how do I make it safe??


Chinaka asked
Mike Deau answered ·

2 Answers

Fusing Smart Battery Protect

Hi all,

another novice question.

just a quick question, I’m planning to use a 100a smart battery protect (SBP-100) to cut dc loads against under-voltage to prevent damage to the lithium batteries...

Do I need to in-line fuse directly before the SBP-100? With let’s say 100a fuse or less?...

It’s a 12v motorhome system, it’s fused (200amp) immediately after the batteries- goes up to the Victron lynx distributor And then the DC loads will be fused accordingly- but do I need to fuse from the +ive busbar to sbp with a 100a fuse. The 4 lynx connections will be used to connect and fuse the charging sources, dc/solar/ac-dc etc so my intentions was to use the un-fused m8 connections on the right hand side of the unit that would ordinarily be used to connect further lynx distributors.

so earlier on the system is protected by a 200amp fuse and the dc loads will be protected after the BP but does the SBP require fusing. I understand that fusing generally protects the wire/cables and not the device, I’ve oversized cables so that’s not an issue.

Also dc loads will be no where near 100a but it was just as cheap to buy a 100a over a 60a so I went for the 100.

Thanks for any advice

Harrison asked
Harrison commented ·

0 Answers

About my victron system using battery protect


Hello I have updated my electrical design for my wiring, I made sure that the current would flow into the BP in and leave from the out. Can you please let me know if this is safe thanks

Chinaka asked
Chinaka commented ·

1 Answer

Battery Discharge Protection - Inverter

I have a mobile (Caravan) system that is Lithium based but I DO NOT have Victron Lithium batteries. My batteries also do not have an accessible BMS. They are a Renogy 170 AH lithium batteries.

My system is charged via a Victron 100/50 Smart Solar MPPT and a Victron 30 amp AC charger. I also have fitted a BMV712, smart battery sense and a 65 amp Smart Battery Protect.

I am about to install a NON Victron Inverter 2800/5600 watts to see how much I can do via 240v instead of gas. Induction cooking etc.

my question is about how I best protect my batteries from over discharge whilst using the inverter.

I have read that you should not use a Smart Battery Protect on an inverter. Is this correct?

if you can then the 220 amp model it may be a bit small (2640 watts).

Can I use the BMV712 to activate a relay to disconnect the inverter?

Are there any other alternatives?


Strop asked
Matthias Lange - Service Team Döbeln DE commented ·

3 Answers

Protecting LiFePO4 batteries from all sorts of things If I connect my MPPT, DC2DC charger and a EHU charger to one side of a Battery Protect and the other side to the battery, and connect my BMV712 relay output to the Battery Protect, would that then disconnect my battery bank to prevent being charged when the temperature drops cold (as well as if it gets too hot) and disconnect in the event of low (or high) voltage events? Or is it not so simple as that?

brassmonkey001 asked
brassmonkey001 edited ·

2 Answers

SBP100 (not product failure)

This is a relatively new and small system that has previously worked as expected. Has been disconnected past two months. Was reconnected yesterday. The two SBP's were updated. One SBP is 'charge' and other is 'load'. The VE Li-ion battery was charged to full via solar and orion Tr smart as of today. There was no DC load output from the 'load' SBP. On the smartphone I could not toggle this SBP to "active", it did display consistent battery volts. Voltage checked with 13.35 on the 'IN' and 2.64 on the 'OUT'. I could not reboot unit from default/power off. The 7 digit display does go thru a flashing mode with 'zero' above and below, (not a full digit or letter) briefly, then no further blue indicators.

I'm curious what I did to toast it. I feel confident that directional wiring is correct. Have ordered a replacement.

rodney abbott-buchanan asked
rodney abbott-buchanan answered ·

1 Answer

smart battery protect 12/24 won't connect to victron connect app

My smart battery protect 12/24 shows up as a device on my victron connect app dashboard, but when I click on it to connect, it gets stuck at 20% and wont fully connect. it says "connecting" and progress bar is stays at 20%. I have 2 smart battery protects and the other one connects just fine. Is there some sort of factory reset? Any thoughts?

mikeras asked

0 Answers

Connecting Battery Monitor BMV-712 with Battery Protect BP-100

How can I connect the relay terminal of the BMV-712 battery monitor with a BP-100 battery protect? I want to disconnect the battery in case the capacity of the battery has reach a defined percentage. I only can programm the cut off voltage off the BP-100, but I want to use the capacity information from the BMV-712.

Adversor asked
Reklusiv commented ·

1 Answer

Will a GX device turn off MPPT chargers in response to a VE Bus over-charge event?

Currently I have all my LFP charge sources connected to the charge bus via a Battery Protect 220. I have become aware that this is no longer recommended due to reverse current flow in the BP, I have an anchor light connected to the MPTT load port drawing a few milliamps using the Streetlight function, this small current is passing through the BP the wrong way.

My question is this. If I connect my MPPT controllers directly to the charge bus, (bypassing the BP), will my VE Bus BMS shut down the MPPT charge controllers in response to an over charge event or do I need to interuppt the MPPT charge current some other way?

Tim Chapman asked
Tim Chapman edited ·

0 Answers

Battery Protect stuck on

I recently purchased and installed a 48V 100A BP and the app on my phone, tablet, and laptop all used to be able to shut the BP off by the switch in the app. Now the switch on the app moves and it shows “disabled by user” but it’s still on and active. If I change the setting on one device I see it changed when I connect on another device. It seems like the relay is stuck... what can test or do to address this?

DeeperID asked
Guy Stewart (Victron Community Manager) commented ·

3 Answers

Lithium Starter Battery


I've received some equipment to upgrade my boats electrical system. However the company have sent me the wrong battery (100ah drop-in lithium) - should be 100ah Victron smart.

Anyway, they are going to do a swap out, but I was thinking if it would be possible to use it as my starter battery and maybe run a few other things from it - deck wash, nav lights...

My system will have 4x 100ah Victron Lithium batteries for the house bank. This is connected to a 12/3000/120 multiplus.

The solar MPPT and Alternator are connected to a 85ah agm battery and that connects to a cyrix li-ct in order to charge the house bank when charge is available.

What I'm thinking is to do the same with the MPPT, but run it through a Battery protect and have the ignition wire for the balmar external regulator also go through a small battery protect - both will be connected to the BMS charge disconnect that I have routed through my BMV 712 relay and set to disconnect at 14.2v.

Main concern is that currently when the Cyrix disconnects when solar charge is occurring the starter gets a quick dose of around 15volts before the MPPT reduces current.

Will the BP catch this quick enough in order to stop it getting to a lithium starter battery?

I don't think the same will occur with the alternator as once the regulator ignition wire goes out the stop off current should be instant, but say if you think I'm wrong.

Hope you can clear this up and maybe give alternatives I haven't thought of.



stocksy asked
ejrossouw commented ·

1 Answer

Charge Source Priority?

Hey Everyone,

I am in the middle of a van conversion. I've got solar, shore power and alternator for charge sources.

I was curious about how the devices in my charging system decide which source to charge from and if they are smart enough to realize that the system is already being charged by another device already. I don't want to jam too much current into my batteries.

My current setup is:

-200AH (100AHx2) AGM batteries (wired in parallel) max charge current is 60A

-310W Solar Panels

-Victron BMV-712

-Victron SmartSolar MPPT 100/30 Smart

-Victron Orion TR smart 12/12-30 Charger

-Kisae IC-122055 AC Charger/Inverter (55A Charge) - Shore Power

-Victron Smart Battery Protect - I was thinking of using this to turn off all DC loads with the push of a button.

Scenario 1: If I am plugged into shore power and the sun comes out and the MPPT decides to start charging at the same time, I could see a very high charge current (80A) with both devices trying to charge at the same time, correct? Or would the MPPT somehow detect the charge voltage of my Inverter/Charger and not start?

Scenario 2:

The van is charging from the MPPT and I decide to go for a drive. I start the engine and the Orion decides to start charging. Technically this scenario wouldn't exceed the max charge amps of the battery but I am just using it as an example.

Am I overthinking this?

Loomin asked
adric answered ·

4 Answers

Charge Disconnect Events with Smart BMS CL 12-100

Hello everyone.

May I please have your help with understanding charge disconnect events when using Victron’s 12.8V 300Ah Smart Lithium Batteries and a Smart BMS CL 12-100.

Along with these, two Smart Battery Protects will be used in charge disconnect roles; one for solar/MPPTs and one for a second alternator.

So, is it correct that a charge disconnect event will occur with each of the following:

1. a battery cell’s voltage reaches maximum
2. the temperature of a battery exceeds maximum
3. the temperature of a battery falls below the set minimum
4. the charging rate for a battery exceeds maximum ??


You might reply with something like:

1. Yes
2. Yes. Think about installing a cooling fan.
3. Yes. Watch your back for polar bears.
4. Yes. Dial down that nuclear charger!

Thank you. :-)

Valden asked

0 Answers

Weird Battery behavior Solar Charger


What do think about that? My Battery already dropped to 3V but nothing was changed on the 8th. And all Energy Users are switched off.

strohw asked
Matthias Lange - Service Team Döbeln DE answered ·

3 Answers

Victron Battery Protect for over discharge protection

Hello, because of the lockdown I find more time to mess about it the solar shed. I have a Victron Battery Protect in between my bank of lead acid's and my inverter. I programmed the Victron to programme 4A which if I understand the instructions, means it will switch off power to the inverter if the voltage falls bellow 11.5v for 90 seconds on a 12v system. Can someone confirm that is correct ?

Am I correct in thinking that if my (old) batteries cannot sustain 11.5v for 90 seconds and it drops to 10.5v, then the Victron will not activate, at which point the inverter BP will kick in, sound an alarm and cut the power ?



Umpa asked
Umpa edited ·

2 Answers

Sonnenschein A602/1130 Solar NGS6021130HS0FC battery setup

Soon I'll have new batteries: Sonnenschein A602/1130 Solar NGS6021130HS0FC (2V x 24).

My system:

2 x MultiPlus 48/5000/70-100

48 x 150W Solar panels

2 x BlueSolar MPPT 150/70-Tr/MC4

Color Control GX

Dear Victron team,

can you help me specify parameters, which I should input into each Multiplus to operate these batteries correctly:

1. State of charge when Bulk finished.

2. Battery capacity.

3. Charge efficiency.

4. DC input low shut-down.

5. DC input low restart.

6. DC input low pre-alarm.

7. Absorption voltage.

8. Float voltage.

9. Charge current.

10. Temperature compensation, mV/deg.

11. Sustain voltage during the first 24 hours of sustain.

12. Sustain voltage after 24 hours of sustain.

13. ESS setup - Cut-off voltage for a discharge current:

0.005C = ? V

0.25C = ? V

0.7C = ? V

2C = ? V

Alexander Ushakov asked

0 Answers

Smart BP; Relay mode vs Li-ion mode?

I just replaced my BatteryProtect with a Smart BatteryProtect. What's difference between the "Relay" and "Li-ion" modes? Pros & Cons?

I was using B7 on the old model. The remote lead comes from the VE.Bus Load Disconnect port.

All components are Victron, including, but not limited to, the CCGX, BMV-712, VE.Bus, MPPT, Lithium Battery Smart, Digital Control, etc.

Edgargw22 asked

0 Answers

BP220 short


I have a BP12/24 220, it is between a 12v vehicle battery and 2 leisure batteries (12v each) parallel. there is an 1800w inverter wired to leisure batteries with remote on/off switch. I have just done a basic test on the BP, disconnected the remote plug then disconnected the IN from vehicle batt. I still have 13.2v at IN(at time) feeding across from the OUT. surely this should be 0v or very low?... Is there another way of testing or is the unit fried?

Its an ex crew van converted to camper so the set up was already in and wired this way.

roamforloam asked
Justin Cook - Bay Marine Supply USA commented ·

3 Answers

Battery deep discharge protection

we are using your BlueSolar PWM Light charge controller 12/24V in different projects and we faced deep discharge problems on Lead-Acid batteries (we are using Panasonic 12V 7,2Ah LC-R127R2PG or Yuasa Brand)

The BlueSolar user manual displays that the Charge controller comes with deep discharge protection and cut off the load when the battery voltage reaches 11.2VDC. The problem is that the controller itself comes with a self power-consumption of 10 mA and can damage the Lead-Acid battery if it's still operating. Does the Bluesolar PWM goes to sleep power mode or disconnect itself when the deep discharge on battery is detected ? Or it still continue to grab power from the battery.

Would you mind to let us know which kind of protection /circuit should we bring to protect definitely the battery against deep discharge.

DamonP asked

0 Answers

Victron Battery Protect "On resistance"

Hello. I am wondering about the resistance of the Victron battery protect 65, 100, and 220. I am in a situation where the 100A model may be suitable, but the 220A model could make my system more efficient.

Solid state relays have a certain amount of resistance when switched on. An example value is 0.02 ohms. With a 100A load, the power consumed by the relay would be (100^2)*0.02 = 200W. The resistance is also dependant on temperature. I suspect that the 220 model is the same as the 100, just with better heat dissipation.

jmz506 asked
Airtime commented ·

2 Answers

BMV-712 Settings; COM port for VE.Bus Charge Disconnect port

What should the BMV-712 relay settings be after I connect the COM port to VE.Bus Charge Disconnect?

The signal from the BMV-712 COM port is OFF when I'm on Shore Power and therefore there's no charging of the house battery. It's also OFF when I don't have Shore Power.

Can anyone point to documentation that talks about settings when I'm using Victron BMV-712, VE.Bus and Battery Protect? The manuals talk about the specifics of each device, but don't provide any assistance when integrating with other components.


Edgargw22 asked

0 Answers

Batery Protect settings; Solar vs DC Load?

What settings should I use for both Battery Protects in my Victron Lithium system? I assume that I should use mode "B" (relay) and let the BMV-712 to it's work. Is it still necessary to set the shut down level? If so, is there a different setting for the Solar BP vs the DC Load BP? TIA...


For your referance, I have the following equipment:


Edgargw22 asked

0 Answers

Battery Protect and Opto-Isolator

Can I replace the remote on/off switch of a BP with the open collector output of an opto isolator such as 4n35? Similar use to switching AUX i/O on a Multiplus?

Avontuur asked
Arve commented ·

3 Answers

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