battery capacity Image

battery capacity

Multi control battery level

3 days ago we had a Victron Energy multiplus 24v 3000va 70 amp, multi control, 6 360w panels and 12 lead acid installed. I asked the instaler 3 times how to check the battery level and he skirted around the question and ignored me 3 times. So now I have this system but have no idea what is going on with it. so now I ask you folks the same question. On the multi controller, what setting is the actual battery level. I have no idea how to view the amount of charge the batteries have. Thank you in advance!

purifiedlife asked
purifiedlife answered ·

2 Answers

Sporadic electricity from the grid

Every day I sporadically draw electricity from the grid, although the battery has sufficient capacity and there are no peak loads at this times.

Can I change this so that electricity is no longer drawn from the grid?

On average, 500 watts are drawn from the grid every day.


vici asked
sharpener rolled back ·

2 Answers

brand new Victron AGM battery capacity

Hi everyone,

I've just bought a Victron AGM 220 Ah 12V battery.

As it will be inserted in a 48V battery pack, I've measured the C20 capacity as well as for the three other existing batteries.

Before to check the C20 capacity, the battery was charged with a Victron charger.

4.7 Ah was added to fully charge the battery.

Then a 11A constant current was drawn from the battery during 17:42 hours, wich gives us a 195 Ah C20 capacity.

Ambiant temperature was found between 15 and 17 °C.

Then battery was fully charged again with 22 A bulk current :

so 183.8 Ah in Bulk, 55,1 Ah in absorption, so a total of 238.9 Ah loaded in the battery.

charge efficiency is 81.6 %.

Is it normal that C20 was found 11.3% lower than specified for a brand new battery and morover lower than 2 years old batteries?

Does this capacity increase after a few discharge/charge cycles ?

What are the manufacturer tolerances values about C20 ?

Thanks for your Help.

N.B.: the three other 2 years old batteries C20 capacity was measured with the same method:

B1 : 212 Ah

B3 : 211 Ah

B4 : 207 Ah


cargol66 asked
melbournepark commented ·

2 Answers

Diode Bridge like join 2 Argo diodes to combine 2 large battery strings


I wonder if VIctron , or other third part, has implemented a diode bridge, like a rectifier bridge used in every power supply from AC to DC, but used for other different purpose: to isolate two big battery banks?. Or they are thinking on it?

The question came up because some battery LiFePo4 makers, has a limitation of 4 units in parallel.

We have in a catamaran 2 banks ,one 1200ah , 4 cells, and the other 800ah, 4 cells. We can not put them all together because that limitation. So every bank has different and separate MPPTs, chargers etc, and we can not get it all for all the bank. And besides, the loads are divided between one and the other bank, so there is an asimetric discharge.

But If we put that diode bridge between then , both banks will act as they were two to the same load, and two for all the different sources. But finally , we will got all the capacity together , and not separate.

The bridge can be done with 2 argo fet, one input (all the sources) -to-two ouputs, and conected, to the two inputs-to-one output ( the loads). Each battery bank would be connected to the other 2 conectors, meanwhile the two outputs are connected to the two imputs


THe thing is Argos are limited to 180A, and we will need at least 250A. And besides, we want to get one integrated component, rather than 2 and wire between them.

With this bridge, both batteries are getting power when generated, but they are not galvanically connected. They will act to each other like they didnt stay there . If one is having more than the other, the former is not going to transfer power to the sooner and biceversa. Besides the bridge will ecualize the Voltage and the power to both. The same with the loads.

To have this working , we need a low forward voltage, as argo fet has, with very low, less than 0,1 v. If we use a common rectifier bridge, the voltage would be around 2v or more, so it is too much

Any idea?

thanks BR

combatdiver asked
combatdiver commented ·

1 Answer

Shunt size for 400V Electric vehicle pack

I am looking at the 500A Smartshunt for my electric truck with a lithium pack and total voltage of 344V (that will soon be upgraded to 400V).

I know 500A is more than enough since my truck can't make it over 200a even at full acceleration on a full charge, but I am confused about the: "supply voltage range 6.5-70vdc" listed in the specifications. Will this only work with battery packs up to 70vdc?

Will this shunt work for my 400vdc application?

Also, how much will pairing a VE.Direct Smart Dongle with this 500a Smartshunt extend the shunt's bluetooth capacity?

chuys10 asked
wkirby answered ·

1 Answer

EasySolar-II 24/3000/70-32 - Battery Capacity setup


I've installed a EasySolar-II 24/3000/70-32 with two AMG 260Ah 20HR 12V batteries.

The system is running, but I didn't find the setup for the battery capacity.

Can someone please tell me where to find the setting for the capacity and also for the SOC?

Thank you very much.

Philipp Sessler asked
Paul B edited ·

1 Answer

Dyness batteries discharge cutoff at 30-40% SOC

I am looking to find the root cause of the early cutoff of my Dyness batteries discharge every day.

My recent (Dec '22) installation has a system configuration that includes:-

- A Fronius with a string of solar panels

- A Victron (Multiplus + Cerbo + mppt) with a second string of solar panels

- 2 batteries (dyness A48100, 5 Kwh each)

Every morning, when batteries SOC is under 40% and home loads peaks reach 3-4 Kw (e.g. microwave, coffee machine and kettle or toaster) I get a low voltage alarm (< 46 V) and the battery gets idle for a while.

The installation shows a few things that I do not fully understand and might be related:

- The batteries seems not to discharge at the same speed. In fact, this morning just after the alarm showed up again, the main battery was under 20% and the second under 60% SOC.

- The BMS and Dyness on VRM dashboard shows completely different instant battery discharge values. BMS might be showing like - 2500 W while Dyness shows - 800 W.

VRM Dashboard Enrique.jpg

enfrafer asked
Bonhardt László answered ·

1 Answer

Doubt about battery tower connection
Hello, we have a question, we have recently installed 4 Pylontech US5000 battery  with a capacity of 100AH each (400AH in total). 

The four are in parallel and we have thought that the 35mm paylontech cables are scarce since they would only hold about 70 AH of discharge. 

Do we put the batteries two by two to a busbar where they join or do we put the first and the last with two cables each?

teatrodelasfuentes asked
nickdb answered ·

0 Answers

My batteries are not using their full capacity. Efficiency losses too great.

Hi Team,

We have 3x Multiplus 5000 inverters on a 3 phase system with 2x 450/100 Smartsolar MPPT and Cerbo controller. Smart shunt connected as well.

9.7kw of PV panels.

We have 8x 1.75kwh Zenaji batteries which totals 14kWh.

This system is technically wired as off-grid however we have the grid set up as the generator back-up. So grid comes in when batteries are depleted via generator settings. This is set as voltage and not SOC. But its basically 10% SOC cut out for the Zenaji' batteries.

We are only getting 8.5kWh out of the batteries according to the Victron Consumption data.
I would love to share the data if someone has time to look at, but I cant attach spreadsheet to this blog. I have attached some snap shots.





Basically, we are getting 60% of total capacity and I am sure even with the losses calculated, somethings dramatically wrong.

The whole system is new. Zenaji just changed all batteries after rigorous testing and no-one knowing if its the batteries or not. Looks like its not the batteries cos we have the same problem still.

One thing I have noticed is that the 3 phase load is unbalanced and 2 phases are only drawing 14w and 100w on average. Im thinking the inverter efficiency will take effect, but surely not that much?

We are getting to the hotter months now and the system is in a garage with no additional cooling. But atm we are only talking 30C days tops and average of 24C in the last month.

So. Where is my power going or is the consumption figure wrong?
Even average figures from the data, It only adds up to 6.5kWh.
Any help would be great. thanks.

shannon-lowke asked
shannon-lowke answered ·

5 Answers

Implausible capacity display with Smartshunt

I've installed a Bluetooth 500A Smartshunt in my RV along with a MPPT 100/20 solar controller. The battery used is a 280Ah LiFePO4 from Forster. After a night out and a morning coffee, the capacity went down to 82%, which is quite common. But within seconds the remaining capacity indicator jumped to 100% with no power connected (except 3W solar power). In this case, of course, the display is no longer correct. Any ideas whether this is a setting or a hardware issue?


willigoing asked
willigoing commented ·

0 Answers

Running a Quattro/Pylontec system over the Winter time and other toughts


Hello Community,

I'm running a Victron Quattro 10KW/Venus/several SolarChargers/ and step by step

5* US3000C than i added further 5* US 3000C and than i added further 4* US 3000C.

so i drive 14 us 3000C, this is a nice power storage (Connected in paralell in 2*7 Batteries) . Everything is running well, i'm very satisfied.

With the experience i get now, i have some questions to make a further development.

1. Running in Wintertime

In wintertime i keep the batteries on a SOC between 70-80%. The weatherconitions are so bad on some days i get 0,5 kWh, so that it makes in my oppinion no sense to drive the system.

So I run on Grid.

Now the Queston 1: Is it possible to run the System as an stand by system ? if the grid goes down ,

the system should switch to batterys. how does the settings look like in VE Config, if possible ?

2. Further Batteries

in the Victron manuals they write, you can add 15 Pylontec batteries without an hub solution..

Now Pylontec added a new US 5000C batterie ... is it possible to add one further batterie US 5000C to my 14 US 3000 batteries as an third battery string ? has this new US 5000C be the Master (the first Batterie in the line?

thank you for sharing your thougts an a hyppy new year

uli u. aus s.

uli-u-aus-s asked
uli-u-aus-s answered ·

3 Answers

Evaluate battery capacity

Hi everyone,

My lead battery (12 OPzS) is getting old (9 years). I am figuring out how to evaluate its actual capacity. The steps would be:

  1. Diminish the reporting frequence to VRM to limit error on times
  2. Equalize, measure the electrolite density
  3. In the evening, take note of time (h1) and SOC (S1) of the end of solar charging or at the very beginning of decreasing SOC;
  4. Cut off the feed from panels
  5. Next day follow SOC until 50% (s2)
  6. Note time (t2) and put back on the feed from panels
  7. From VRM note total load L between t1 and t2
  8. Cx=100*L/(s2-s1)
  9. x=(t2-t1)/(s2-s1)

I will not try to evaluate the voltage: not accurate. The electrolyte density should be enough

Any other method?



Lionel SEYDOUX asked
Lionel SEYDOUX answered ·

7 Answers

Expanding battery storage


I am approaching the stage where I will be adding more battery storage to my system as funds will soon be available

Currently, I have a Multiplus 2 48/3000 with 1 * Pylontech 5000 battery (100ah), the 48/3000 is more than sufficient for 99% of my daily peak load, I have 4kwh peak AC tied solar and also cheap rate electricity in the night (UK) which I can use to charge up the batteries on low solar output days

Am I now best to stick with Plyontech for expanding the storage or can I purchase 16 Evo LiPo4 cells, a BMS and a Victron smart shunt and add more storage this way. This method seems more cost effective / kwh than the Pylontech modules but would the MultiPlus operate correctly we the 2 types of storage?

Thanks in advance


simon-jukes asked
kevgermany commented ·

3 Answers

Battery Performance Monitoring

Hi there,

looking for some help to understand how to see if my batteries are performing to spec. If I look at the VRM dashboard, go to Historical Data, then the Consumption tag, I see that my battery has supplied much less energy than I see in the Solar tag That the solar system has put into it.

For example, yesterday my consumption tag showed 56kWh total consumption with 20kWh from the grid, 22kWh from the solar panels and 14kWh from my storage batteries. Then looking at the solar panel tag, it showed a total of 45kWh produced, 22kWh went direct to loads and 23kWh went to my batteries.

Can I compare the 23kWh put into the batteries with the 14kWh produced?

These are not isolated numbers, my system shows an average of a 75% recovery from the batteries.

I have 19kWh of storage using 10 Zenarji Aeon A48-40 cells. Zenaji suggest that the monitoring system within the VRM could be inaccurate or I may need a smart shunt installed.

I have a 3 phase system with 10kW of solar, 3 off MultiPlus 11 units and 2 MPPT 250/100 with enery meter and GX control

Any help would be appreciated

noel asked
Alexandra commented ·

2 Answers

Battery banks capacity

I have a battery bank made of 6 pcs. ETHERNITY 8PzS-ET 1000-LM C5 2V connected in series. The total capacity of that traction battery system is 12V/1000Ah/C5.

Some producers have informed the capacity of the cell measured with C10 or C20. Could somebody tell me what is the right value to write in my Victron MPPT 150-85 solar charger controller and in my Victron Multiplus 3000 KVA 12V 16A inverter charger? Battery capacity has to be put there in both.

What difference is there to using for example 1000Ah/C5 or 1200Ah/C20 with the same battery?

hanski asked
hanski commented ·

3 Answers

147 Posts
144 Users

Topic Experts

248 Points
111 Points