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battery capacity

SmartShunt with VE-Direct to RPi Venus and VE.Smart Networking to MPPT ?

I ordered a Victron SmartShunt 500A/50mV as BMS in a TinyHouse.

I have a Smart MPPT 100/20 and a Victron Inverter Phoenix 24/800 VE. Direct, both are connected to a Raspberry Pi 2 Venus with a VE.Direct to USB interface for logging to VRM online portal and onsite lcd screen for insights.

The SmartShunt will be connected with a VE.Drect cable and VE.Smart Networking.

The idea is to use a VE.Direct to USB interface from the SmartShunt to the RPi, so that with the setting: "has DC system" the total DC load is measured and also know the SoC of the battery.

Then also use it with a Smart Network to the Smart MPPT.
Like in:

In the manual: "A VE.Smart network containing a SmartSolar with temperature sensor and a MPPT solar charger, the solar charger receives the battery voltage and temperature information from the SmartShunt and uses this information to optimise its charge parameters. This will improve charging-efficiency and prolong battery life."

I want in the future use a Victron Energy Smart Battery Sense (mainly for temperature compensation) so that the aux input port on the SmartShunt can be used for midpoint voltage.
Can the Smart Battery Sense use the VE Smart Networking and the MPPT and the SmartShunt too also to use this temperature setting?

I want also make a VE.Direct cable connection to Venus and also monitor the midpoint voltage of the battery bank (cable included); 2x 12v in series. Is it possible to use VE.Direct cable and VE.Smart Networking at the same time?

How important is the temperature sensor? The batteries are below the roof, so in the summer there are possible high temps (> 35 celsius) and in the winter low temps (-5 < 0 celsius).

Other questions about settings of the SmartShunt:

  1. 7.1.1 Battery capacity
    With the Battery capacity setting (manual 7.1.1 Battery capacity) you set a parameter for how big your battery is. But there is no indication in the manual for what C-rating this setting is. Is it safe to asume that the setting is for a C20 rate?
    For my Victron Energy AGM Super Cycle battery (BAT412112081) this is than 125Ah

  2. 7.1.2 Charged voltage
    The Carged voltage setting is 0.2v or 0.3v below the float voltage.
    In the battery datasheet: "" the float voltage = 13.5 - 13.8
    (would be nice as the datasheet gives an one voltage instead of a range).

    Assume float battery voltage of 13.8 x 2 (batteries in serie) = 27,6v - 0.2v = 27,4v for charged voltage setting. What is better, to low or to high?
    The manual has a default of 26.4v Why so low?

  3. 7.1.10 Battery starts synchronised
    The batteries aren't fully charged due very clouded weather for continious days.
    So the best way is not to set the: Battery starts synchronise (manual 7.1.1) in the OFF state?

  4. 7.1.7 Charge efficiency factor
    The batteries are 2 year old. How te measure the current state of the battery? Maybe it must be less that 95%?

  5. 7.3.2 Temperature coefficient
    What is more importand, to use the aux port for temperature coefficient or for monitoring midpoint of a battery bank (2 batteries in serie)?

Sorry for the long posting, but I hope this makes the use of the SmartShunt more clearly for all the Victron Energy users around the world.

Marnix Keesmaat asked

0 Answers

Quatro 24/5000 with smaller than recomended 200 AH Battery Bank

I am considering a Quatro 24/5000 and have a 200 AH battle born battery bank. In the manual it says 400AH is the minimum. Would I need a soft start for this and are there any other problems that could occur from using a smaller battery bank?

mrcc11 asked
Paul B answered ·

1 Answer

SONNENSCHEIN A602 SOLAR 8 OPZV 1130 battery capacity

I installed SONNENSCHEIN A602 SOLAR 8 OPZV 1130 with QUATTRO 48/15000/200-100/100.

According to its manual, battery capacity C10 = 908Ah and C100 = 1096Ah. Accoring to label on the battery, its C120 capacity is 1131Ah.

What number is supposed to be input to VE configure program? C10, 20, 100 or 120?



Alexander Ushakov asked
rainerb commented ·

3 Answers

BMV 700 Monitor not updating battery capacity from solar

System MPPT 250/60 with 6x 330W solar panels and 2x4x12V batteries = 48V.

Everything works fine except BMV monitor battery charge reading that starts with 100% after reset but then keeps on dropping to 0% notwithstanding full charge daily usually to float state. All other readings, e.g. incoming solar current, voltage and power seem to be accurate. All settings checked and verified electronically + internet by certified installer and also by an independent certified electrician.

During rain or clouds with partial charging the battery status is my guess only. When then charging overnight from external Lister generator the battery level is accurately updated all the way to float and 100%, so the monitor does work for external charging.

What must be changed so that the monitor updates the battery charge from incoming solar power and can tell how much capacity is still available?

ajsmuts asked
Matthias Lange - DE edited ·

1 Answer

AGM Super Cycle Four Bank Significant Reduced Capacity

I installed 4 x 145ah Super Cycle AGM's 18 months ago (Still under Warranty). They were marvelous giving us days service before needing charge. Usual discharge to 12 volts.

This week suddenly we have extremely low capacity and using our normal charge methods (Sterling shorepower 40A charger set to AGM) or the boat engine alternator. Absorption charging at 14.6V and 14.4V respectively. The shorepower drops to 13.6V for float.

I only seem to be able to get 50ah storage into batteries (using NASA Marine Clipper BM2 battery monitor) and then the charge current is down to 1 or 2 Amps within 4 hours or so.

Why would this have happened to four new batteries and so suddenly?

Help very much appreciated.

tom-slattery asked
billknny edited ·

3 Answers

BMV 712 won’t accept battery capacity > 999Ah

I’m trying to set the battery bank size through the app for my BMV 712, but it won’t accept values greater than 999Ah. Any values above 999Ah reverts back to just 1Ah when tapping accept. Is this a bug or limitation of the app?

For background, I have 12x Lion UT 1300 batteries, each have 105Ah of capacity for a total of 1260Ah. They are wired 4s3p for an operating voltage of 48v.

Any help is greatly appreciated, thank you!

scott-bull asked
Guy Stewart (Victron Community Manager) answered ·

3 Answers

Does this graph indicate my solar array is not keeping up with usage?

Hi, I've attached a screenshot of my VRM dashboard for the past 30 days for my remote cabin off grid system. I've had to reset 100% SOC a few times once my LionEnergy battery bank (2 - 12V in series 105ah) batteries are showing 28V (for some reason the BMV never seems to show them as 100% charged...i have to rest them when they get to 100% 28V). Those resets are indicated by the peaks in battery SOC at 100% in image. I only leave on a refrigerator in the cabin when I'm not there and have it on a timer to turn off between 10PM-1AM and 2AM to 5AM. Does this graph indicate that the 3.16kW energy harvested per day isn't enough to keep up with the draw/load? I have a 1.46kW array (using victron MPPT and inverter/charger).


lo-g asked
billknny answered ·

3 Answers

a big thank you and a battery question

i would like to thank everyone who spent time answering my stupid questions and helping me out to fix my solar problems. i changed my solar panel setup from 12v to 24v, got a new battery and now i harvest about 850 wh per day.that's a huge improvement that allowed me to power a fridge among other things (a word of advice for off-gridders, buy a dual function chest fridge, huuge difference form ordinary ones) .

a question about batteries: since a battery is considered to be charged when >12.8 or so, what if the battery is charged at 13v or more? how charged is considered? my battery is at 12,64v every morning, what state of charge is that considered to be? (gel vrla battery)


greekgeek asked
wild-thing answered ·

3 Answers

Settings Depth of discharge offgrid


My setup:

Multiplus 2 5000

Byd b box pro 13.8

Im searching for the settings for depth of discharge setting. I can only find it at ESS but its not allowed to activate it running an offgrid version

I would like to shut down the system at 15% and reactivate the inverter at 18%.

Thanks it andance

melonentier asked
melonentier answered ·

2 Answers

Inverter maximum battery capacity

Could someone be so kind as to tell me the maximum battery capacity that both the 48v 3kw and 5kw multiplus inverter charger can handle? (Intend I’m using Pylontech 48v us2000).

merlin asked
merlin commented ·

2 Answers

Lithium SuperPack Battery - C/Ratings

I’d like to know the C/20, C/10, and C/5 ratings for the Superpack 200AH battery model.

I need this info for correctly calibrating my Simarine Battery Monitor to get the right SOC.

I currently have (x2) batteries in parallel, equivalent to 400AH total, but plan to add more later.

octafish asked
octafish edited ·

2 Answers

Battery Capacity for Multiplus 5000

Hello, I had a question: can I use the Multiplus 5000 24 v with a 300 Ah battery? The manual indicates the recommended capacity of 400-1400 ah, what does it threaten and did anyone come across this situation? Battery connected via lunx ion BMS and DVCC enabled.

anton859 asked
anton859 commented ·

1 Answer

What voltage should the Victron lithium Battery cells be at full charge?

I got some good energy today based off this image


Looks like my mppt charge controller never left bulk charging however.


I just got myself some lithium batteries and have some questions....


what should the individual cells be at full charge? Is there a way to know how much capacity % is left in the batteries? And why did my mppt charger never go into a float mode to tell me batteries are full..... did my batteries not fully charge today? Is 5+ kwh enough to charge 2x 200ah batteries??

I'm trying to determine if I'm charging the batteries correctly, and how to know basically how much energy is needed to be full, or how much energy is left before empty on the batteries.

pic below is battery parameters on the mppt solar charger.


nicvazquez asked
Justin Cook - Bay Marine Supply USA commented ·

2 Answers

My Victron app is showing my production at 1-2wh a day when it used to produce around 1.5kwh per day.


It’s summer time so I’ve been leaving my refrigerator running all day for the last couple months. I bought my truck into the shop for a check engine light but when I brought it back home the Victron app suddenly showed that instead of producing the normal 1.5kwh of power a day, it was only producing 1-2wh a day. Even with nothing running, I would typically produce 10-20 wh a day. After two weeks of having everything completely off, I broke out the multimeter and began reading everything. The Victron app is showing my charge as being in the float state but my multimeter is reading the batteries as only 12.2v with solar collecting 35-36 pv and sending 13.7v to the battery. i turned on the fridge to see what about my battery power and it dropped to 12.1v with the Victron box remaining in the float state. I then turned on the truck and began charging the batteries through the truck batteries and raised the batteries to read at 12.9v however with the fridge running, after about 30 minutes, the batteries were back down reading at 12.4v. Still the Victron box is indicating the float state of charge.

Has anyone else had this issue or can tell me if it is the batteries that need replacing (I have two 350amh batteries connected to be 700amh at 12v) or if the Victron box is the issue? Possibly the box thinking it is in float state means it is not delivering any voltage to the batteries so they are depleted. Or the batteries need to be replaced because they can’t hold a charge.

This all started when I dropped my truck off for a check engine light. I left it at the shop for 3 days during which time they may have had it inside and outside since it shows it made some solar those days. I’m worried maybe it was inside too long so the batteries might have died and now they don’t make their full potential anymore. Or possibly the shop flipped a switch or a wire they didn’t mean to touch. When I asked, they didn’t recall hitting anything unrelated to the check engine light but I wasn’t there so anything could have happened over the 3 days. The Batteries are expensive so I’m hoping to fix other things before replacing the batteries.

jlshattuck asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Probleme mit Victron GEL Batterien 220 Ah

Hallo allerseits,

ich habe Probleme mit 2 Victron GEL Batterien 220 Ah. Die wurden im Juli 2018 in einen Wohnwagen eingebaut. Seit März 2020 haben beide Batterien nur noch eine Kapazität von ca. 10 %. Getestet wurde mit einem professionellen Batterietestgerät, das über mehrere Tage definiert die Batterien auflädt und entlädt und dann die Kapazität berechnet.

Beide Batterien haben jeweils einen Victron Solar-Laderegler 100/50 und ein jeweils eigenes Victron Ladegerät 12-25. Sie sind auch nicht hart parallel geschaltet, sondern über einen Victron Combiner zusammengeführt, so dass ich Querströme ausschließen kann.

Die Solaranlage liefert 850 Wp, so dass immer genug Nachladung zur Verfügung stand. Der Wohnwagen wird ganzjährig bewohnt. Solange der fest steht (98% des Jahres), hängt der am Landstrom, so dass auch die Victron Ladegeräte die Batterien stets voll gehalten haben. Es hat bei einigen wenigen Fahrten im Winter mal eine Entladetiefe auf ca 70% gegeben, also weit entfernt von den 50% entnehmbarer Kapazität. Gemessen wurde dies über zwei Victron BMV.

Jetzt hat mir der Händler mitgeteilt, dass jeder Kalendertag einen Zyklus darstellt, und die Victron GEL Batterien nur eine Zyklen-Lebensdauer von 600 - 700 Zyklen haben. Das würde ja bedeuten, dass Victron GEL Batterien ganz generell nicht in Solaranlagen tauglich sind, wo sie jeden Tag mit Sonnenaufgang einen neuen Zyklus beginnen.

Wer kann mir was dazu sagen? Alle 2 Jahre zwei neue GEL-Batterien von Victron zu kaufen ist mir zu teuer. Wenn die auch nicht länger halten, als billige Batterien vom Discounter, warum dann Victron?

Nette Grüße


gode-re asked

0 Answers

Are my batteries past their best

I have obtained, at a sale 4 x Victron Gel 12-220 batteries connected to a Quattro 24 volt 5000 va inverter charger. I know for a fact that the batteries have not had a charge since August 2017. I tested the voltage before connecting them up and they were all showing 12 plus volts

I have connected it up and set it up correctly and left it charging from the grid for 24 hrs at max 10 amps AC, connected via a 13amp plug

I'm looking to sell the equipment so obviously want to know that its all working. The Quattro is working fine and I connected the output via a kWh meter to a 13amp socket and pluged in a 1kw fire. The meter registered 1.8 kWhs before the inverter shut down which I think sounds very low ?

Because the batteries haven't been charged for so long are they essentially only good for scrap ?

If the batteries are, as I suspect past it is there anyway that they can be refurbished ?

Thank you for any advice.

stuart-houghton asked
stuart-houghton answered ·

2 Answers

Victron SmartShunt - Calculating battery degradation

I just ordered the SmartShunt from Victron and will be installing it in a few days. The system I'm installing it on is one I inherited when I moved into my off-grid house. The Flooded Lead-Acid batteries are about 6-years old.

One thing I'm curious about is being able to understand the degradation of these batteries. In the Victron app I will enter the Ah (1020@c20) of my system. Once fully charged and sync'd with the BMV I'll be able to see projected Ah available, battery percent...etc.

The batteries are rated at 1020ah @ c20, but because they're 6+ years old they most likely don't have the same capacity. Is the monitoring app going to give me some kind of way to see that, or does it "learn" how much capacity is actually in the batteries by correlating Ah drawn and comparing it to current voltage?

Any insight appreciated. Thanks!

hummingbear asked
ben answered ·

1 Answer

How to upgrade my Ah if there is no 90Ah LifePo available anymore?

Hey Guys,

I am just wondering if somebody has an Idea, how to upgrade my System to have more Ah available.

Currently I am using 1x 90Ah LifePo. As there is no 90Ah from Victron available anymore and as it is not possible to mix it with an 100Ah, I am wondering what to do?

Any Idea? Or is the only way to buy 2x new 100Ah‘s

Thanks in Advance,


caeike81 asked
Matthias Lange - DE answered ·

1 Answer

C10 or C20 setting in Victron connect

Hi, what battery settings are needed for the Victron connect (Multiplus 800). Should I put a C10 or C20 value?

jess asked
JohnC commented ·

2 Answers

BMV 700 Issue with battery status

Made a mistake yesterday. Pushed the sync buttons when the batteries were only 82% full. This has changed the battery capacity to 100%. Now I can't undo it. How do I get the charge to return so I know the batteries are full.

System is:

4 x 6vDeep Cycle batteries in series and parallel giving 12v and 500Ah capacity

Charge voltage set at 13. 6v

Tail current set at 4%

Everything else set at factory default.

Any suggestions how to get batteries back to their true 100% capacity?



kiwibev asked
kiwibev answered ·

2 Answers

What Battery Capacity to use when connecting different sized batteries in parallel?

Hello. I installed a BMV712 (Bluetooth) and 75/10 SC (for 100w mono panel) on my s/v, connected to two West Marine AGM 6v GC2 (190AMH) - this is my house bank, series-connected and to shunt. I also have one West Marine AGM Grp 24 (79 AMH) starter battery connected to negative bussbar that has primary neg wire led to shunt.

Not sure which battery setting for both apps and due to two different AMH batteries; no info came with batteries. Help?

Also, what battery bank capacity do I show? 190 or 190+79?

thank you.

maukamakai asked
maukamakai commented ·

1 Answer

victron 250/100 lädt batterien nicht vollständig - welche einstellung ist korrekt


wir haben 3 250/100 im parrallelbetrieb und laden damit 24 batterien 2V - 12 OPzS 1500. Problem - die Laderegler schalten bei angezeigter Batterie- Spannung 60 V vom Bulk in den Absorption Modus und laden nicht weiter. Die mit Spindel gemessene Batteriespannung beträgt zu diesem Zeitpunkt aber lediglich 1,22 und müsste weiter laden bis 1,26 um die maximale Kapazität auszuschöpfen. woran kann das liegen bzw. was müssen wir anders einstellen ?

Lieben Dank

weinlandmallorca asked

0 Answers

Battery capacity settings

In VE Configure 3, when you enable battery monitor, you need to supply your "Battery capacity" in Ah. If you have a 48V system and 4 x 200Ah batteries do you set it as 200Ah or the sum of all the batteries (800Ah) ? I have checked the manual and posts and cannot find absolute clarity on this.

Many thanks.

Enrico Zanolin asked
wkirby answered ·

1 Answer

How low should I set my low Battery voltage cutoff?

Hi folks, so I got a 840ah Trojan battery bank, about 2yrs old. I have a battery extra desulphating unit connected all the time. My Victron energy meter is set up correctly I believe. I have an auto start generator set to come on at 11.05volts. However, my %SOC usually states this is just 84% of my capacity. I know voltage is a tricky way to judge the discharge, as if I take a high draw,say 800w coffee machine, the capacity has to be over 95% for the voltage not to drop below 11v. We leave our inverter on 24/7 to run a germicidal lamp for our water system. So my question is: if I set the generator to come on at say 10.5v is that going to damage my batteries if it is still saying I’m above 50%capacity? Today the Generator came on at 84% or -156ah. I don’t seem to be making full use of the capacity of the batteries. I find looking after the batteries a minefield of difficult judgements!
Any help much appreciated!

solarricht asked
solarricht commented ·

1 Answer

Difference between Battery Monitor VS BMV 712

I am trying to understand the difference Battery Monitor vs BMV 712 ? Couldnt get it. Why someone should buy Battery monitor over BMV 712 ?

heraktitus asked
heraktitus commented ·

1 Answer

Battery capacity not in AH on data sheet


I have a set of CSB HRL12330W form a decommissioned UPS

The battery capacity is listed as follows on the data sheet anyone know how to calculate the what is the AH capacity to program into my inverter

350W @15 minute-rate to 1.67V per cell @25℃ (77°F)

byrons asked
Riaan Barkhuizen commented ·

2 Answers

Cell balancing problem 5x90Ah LioFePO4

Hi everyone,

I´ve been using 5x90Ah 12v LioFePO4 in my boat for five seasons now.

This summer I experienced some problems for the first time. When SOC goes down to 50-60% voltage drops to approx 12,5 volts and the BMS shuts down the system.

I´m convinced i have a cell balancing problem here and that the battery with with the worst unbalance is the one making the BMS shutting down the system.

I have the NON smart batteries and looking for a solution to be able to measure cell voltage on my batteries?

Otherwise it´s a "needle in a haystack" trying to find which of the five batteries suffering from cell unbalance..

question nr 2 is how to restore cell balance?

Charging every battery stand alone connected via bms 12/200 or just straight on the battery with a suitable lithium charger (4-5A)?

anders-h asked
anders-h answered ·

2 Answers

BVM-712 VictronConnect Setup - Battery Capacity Unknown

Maybe a dumb question. I have a lot to learn. I bought a BVM-712 to install in a new to me truck camper this weekend (2013 Lance 825). I will use the VictronConnect Android App to monitor. I note that the setup wizard will ask me to input the battery capacity. Unfortunately, I don't have a clue what my battery's AH rating is, and would appreciate advice on how best to proceed. The battery is a single 12 volt flooded lead acid. The label on top reads "MARINE-RV" ;"EXTREME CYCLE DUTY"; "Distributed by ABSS, Everett, WA." That, along with a yellow "8/18", is the only information provided. (I have reached out to the named distributer, but haven’t received a reply yet.)

My question is, how important is it for me to ascertain the battery’s capacity rating and input that into the app? Is it required for State of Charge and Time to Go? If I just guess, will the monitor self calibrate over time? If I should instead manually determine the capacity, any suggestions for how best to do that either using the BVM itself, or a DVM?


scoloc asked
scoloc answered ·

2 Answers

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