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AGM Battery

Shore Charge Current Dropping


I have this small campervan in which I have built some electrical equipment, but lately after some (I thought) improvement I am having some issues.

I have built a Phoenix Multiplus Compact 12A 1600VA together with a Victron Energy 220AH AGM Deep cycle battery into my van. I have connected both a VE.Bus Control panel and a BMV 602s to the system. It looks something like this in a schematic:


Where the ground === the chassis of the van and the leisure battery and the service battery (engine) of the van are separated by a separator/relay.

A few days ago I notices the leisure battery was not charged after a full day connected to shore, and the BMV showed only a voltage of 12V when disconnecting the system from shore... When connected to shore it shows a (expected?) voltage of around 14.5V, but only a charging current of 1A. It often starts out around 5A, but quickly drops to 1A, no wonder the battery is not charging.

After a few days of searching and trouble shooting I still havent figured out the problem, so my hope is on you! The gear is definitely not to newest anymore. But the battery was not heavily used since it was only used on the occasional trip.

Thanks a lot!

Bas Peter

bas-peter-dijkema asked
bas-peter-dijkema commented ·

1 Answer

Normal and High preset charging modifications?

Can I change the normal and high preset charging defaults? Alternatively, can I re assign user defined settings to the mode switch. I would like to customize the settings and use the mode swith to toggle between two (much simpler than bluetooth). One "normal" for slow charging under shore power and one "high" for fast charging with a generator. I'm using Renergy AGM batteries which have slightly different charging specs than the normal and high defaults.

craighealy asked
craighealy commented ·

1 Answer

Using SmartSolar 75/15 with float voltage only


Is it possible to set bulk voltage = float voltage @ 13.6V ? I use my caravan's AGM-battery more as a usv or for peak loads than as a cycle battery. So for extending livetime of the battery I want to prevent the charger to use that battery cooking high bulk voltage.

What will the charger do if I set both voltage equal?

Best Regrads,


jevil asked
Paul B answered ·

1 Answer

Blue Smart IP22 Charger 12v 30A UK Plug Fuse

Hi - I have a Blue Smart IP22 Charger 12v 30A charger hooked up to 3 95aH AGM batteries in parallel. This has been used on shore power without issue to charge batteries from around 95% to 100% without issue, however when I've used this at home to charge from 85% it seems to have blown the 5amp fuse in the UK plug, has anyone else had issues with this, or can suggest any reasons why it would be blowing this fuse? To me it seems like 5amp for this fuse is small on a 30amp charger but I'm trusting it's right as that's what came from the supplier? Thanks!

kylec-03 asked
kylec-03 commented ·

1 Answer

SmartSolar MPPT 75/15 with AGM strange battery behaviour


Yesterday, on a sunny day, I plugged the stuff for my caravan together: 100W solar panel, SmartSolar 75/15 and a 120Ah AGM. Made all the settings as stated on the battery (U_Absorption 14.7V, U_float 13.7) and it works fine - at first. It started bulk with all the current the panel was able to deliver at that time (~ 5A). The load output was at 0.1A. Some hours later it arrives at Absorption at 14.7 - okay so far.

Now the strange thing: When I was back also some hours later, the charger was at bulk loading again with ~5A and the battery voltage was slowly decreasing (~ 0.25V / hr) - I stopped the process as the terminal voltage reached 14V. Battery was cold. Does anybody have an idea what is happening here?

Best regards, Jens

jevil asked
jevil answered ·

3 Answers

Voltage / stage of charge percentage of a Victron Super Cycle AGM battery

I want to know what voltage relates to what state of charge for a Victron Super Cycle AGM battery, as I think it differs from a standard AGM battery. If anyone knows the voltage for state of charge in 10% increments from 0% to 100% it would be greatly appreciated, thanks!

charlielow asked
charlielow commented ·

1 Answer

Victron AGM super cycle on Phoenix Multi 24-3000

Hi all,

Someone has an "old" Victron Phoenix Multi 24-3000-70. His batteries died. He likes to buy the AGM super cycle batteries because of my good experience with it.

The charger settings in the multi need to be done by button presets and leds.

The charge settings i can make closest to the agm charge settings by my understanding are highlighted in yellow. Correct me if i am wrong. See pic below.

Can this settings be used?

Adaptive charging and battery safe is selected.

Thanks in advance!


heinzie asked
heinzie commented ·

2 Answers

Correct Charge Voltage? 14,4 or 14,7


I´m using a Victron Blue smart IP 22 12v/15Ah (3) charger and I would like to set the correct charge voltage for my new battery Victron AGM Deep cycle 110Ah.

14,4v or 14,7v ?

Best regards

Picture from Victron website


perwe asked
Stefanie answered ·

1 Answer

AGM Spiral Preset for Rolls VRLA AGM

I have 8x 12V Rolls S12 230AGM-RE in two 48V strings charged by 6x300W PV panels via EasySolar 48/5000.

The Victron factory Preset 2 seems fine except for the Absorb Voltage 14.4/57.6 whereas the Rolls user guide gives 14.7/58.8. (Float is same as the Victron Preset 2)

Should I edit the Preset 2 Absorb Voltage to 58.8 or use the Spiral AGM preset?

Is the higher Absorb setting necessary?

Is the Rolls S12 series a spiral AGM?

The Rolls manual also gives 40A for the Charge Current. Should I change the default Preset 2 Charge Current of 100A to 8x40(320)A?


hastings asked
hastings edited ·

0 Answers

Absorption times

Hi was wondering if anyone can offer some advice.

I am not sure what absorption times to set on my system. Installed in caravan with daily consumption. System includes 2000va multiplus compact and 100/50 mppt, 3 X 120ah AGM Total 360ah. Need both mppt max absorption time and multiplus absorption times not sure what to set. Will use adaptive absorption for mppt but it there is still max time to set. Thanks in advance Niall.

niallp asked
Alexandra edited ·

1 Answer

Victron Orion-Tr 48/48-6 AGM and LiFe4Po


I want to use the Orion-TR to charge a LiFePo4 battery. An AGM battery serves as the source. Both are 48V systems. The output voltage of the Orion was set to 53V without load. If it is switched on, its not charging. If the output voltage manually is turned up, it starts to whine. The charging power is about 6A, but the BMV-700 at the AGM shows me about 20A of discharge. If the voltage is reduced, the whining stops. If the contact for charging is then opened and closed again, it will not charge again.

Does somebody any idea what kind of fault it could be? The manual is not helping.



-maverick asked

0 Answers

MPPT 100/30 showing hauting behaviour when being in absorption mode


I have installed in my campervan a 315W solar panel + victron MPPT 100/30 + AGM battery 190Ah C10. Everything worked properly during nearly a year. It's been a few days that my MPPT is showing a very strange behaviour when being in Absorption mode.

First of all, the voltage is not kept constant during absorption as it should. The received power keep oscillating between 0W and the maximum power that the PV cell can provide. It looks to me that the MPPT cannot find the maximum power point anymore. Eventually the battery started to make a slight bubbling noise.

I lowered the absorption votlage such that the system could go into float mode and still this strange oscillating behaviour shows up.

Below the configurations and some sceenshots of the status;





Could someone help me with this issue? Might it be an MPPT issue, ... ?

Any help woul be very appreciated.


sacha asked
ripper commented ·

4 Answers

12v AGM leisure battery charging from van alternator

Hello, i have a Ford Tansit van converted into a camper and i would like to charge my leisure battery from the alternator. I was thinking of using the Orion-Tr dc to dc charger. Would this be enough, or is this even a good ideea? Or is there another way of doing it.

Thanks alot :)

buryck asked
southsideph answered ·

3 Answers

Is it possible to use shore power as input for a SmartSolar MPPT charge controller to charge 12V AGM battery?

Hi All,

I am designing my electrics for my van. There is already a 230V AC, shore power, network in my van. I would like to add a 12V circuit for off-grid circumstances, for charging laptop, running lights and a fridge. I would like to mainly charge this battery with 200/300W solar power via the SmartSolar MPPT XX/XX charge controller. But I think it would be beneficial to also be able to charge it via shore power if solar power is no option. Would it be possible and safe to charge the 12V battery (AGM Deep Cycle 250Ah) using a laptop charger plugged in my 230V AC network connected to the SmartSolar MPPT XX/XX charge controller? I would add a breaker between my solar panel and SmartSolar controller and solder a plug on my old laptop charger to easily connect it. This way I don't have to buy a separate 230/12V charger.

Thank you for your help and advice!

laurent444 asked
laurent444 answered ·

2 Answers

Mppt charger settings

I’ve got 3 Victron super cycle 12-230 batteries, connected to a victron solar charger (150/60). I use a victron battery monitor, and even when the batteries are at 75%, it’s still in float. I’ve looked, but couldn’t find the right answer for this. What settings should I input for this battery / charger combo? Funny thing, I’ve got the multiplus as well, it works fine right out of the box as a charger ... no setup needed. Anyway - didn’t want to make a setting error, so thought I’d ask. They should have a default for these batteries:)

dylanhale asked
JohnC answered ·

1 Answer

Full charging of AGMs

Hello. I'm asked to use this facility by posting a q.

In a complete 'lecky refit on a 40 y.o. modest sailboat, I'm fitting 3 groups of AGM batteries - start, port domestics, and s'board domestics. These can be linked. All Optima BlueTops, with a RedTop for starting. The new Beta 14 engine has a 75A 'nominal' alternator with fixed, internally-regulated output voltage. This is nominally 14.4V and the AGMs need 14.7V for full recharge.

I've fitted a Victron ArgoFET 100/3, believing that will do the charging biz. for each battery group... but only so far. I plan to fit some PV panels, for use in 'topping up' when the boat is unattended, and I understand I should fit PV controllers which can/will provide the additional higher Float voltage.

Is this right, and what controller(s) should I fit for this purpose?

oldbilbo asked
neoneddy commented ·

2 Answers

AGM charging current selection on Dolphin charger

Hello everybody,

I have 3 x 12V 95Ah AGM's in parallel and plan is to charge the bank with Dolphin charger when connected to shore power.

Which of below modes you'd choose for setup? If I got it right, "Calcium lead" mode would have the right voltages? I'm planning to use one of the posts of charger to connect the starter battery which is a traditional 12v battery so it would need the "Wet & flooded" option but which one you see would be a best option for this combo with 3 AGM and one wet battery?

Cheers, Mikko



mikko-juuti asked
wkirby answered ·

1 Answer

Agm victron 110ah solar charging absorption time

The article say:

"" "full charge is reached when the current decreases to 3–5 percent of the Ah rating. A battery with high

My new victron 110ah, is daily discharged with 15/ 20% DOD(12.6 open circuit voltage).

After various charging tests with different absorption times, these are the results :

absorb 2A at the ond of 1hr of absorbtion at 14.4v. After, the current drop to 0.8/ 1A at the beginning of floating at 13.8v. And after 4hr of floating decrease at 0.4 A.

If I try to extend the absorption time to 3hr (maximum allowed by my mppt controller), the current does not decrease less than 1.5 / 2 A.
In my opinion it means that it is fully charged with 1 hr of absorption, and with 3 hr I am overcharging it by generating only gas.
Other than that, I measured the open circuit voltage after 24 hours of recharging, and it is 13.14v.
Both with 1 hour of absorption, both With 2 hours of absorption, and with 3 hours of absorption.
What should I do?

francesco asked
francesco commented ·

1 Answer

New victron agm battery accurate solar charging parameters
Hello I just bought a victron deep cycle 110 ah agm to replace the old battery after 3 years.
I would like to ask a Victron technician for the correct parameters.
I only use a solar charge with a fully configurable 30A mppt regulator.
Every day the solar energy is more than enuff to charge completely the battery. 
I discharge the battery every night on average about 20 ah.
I would like to know the correct absorption voltage and the correct duration of the absorption for my use (daily discharge of 20 ah).
Currently I have set 14.5v and absorption duration of 120 minutes with temperature compensation of - 4mV / C / cell. Floating 13.7v.
Today for example after the end of the absorption, the battery absorbed 0.8A in floating at 13.7V.
But trying to increase the floating to 14.5v, I saw that it went up to 2.6A. These is strange for me... 
Does that mean it wasn't fully charged? Or is it due to gas generation?
Then disconnecting the solar panel, after an hour the battery was at 13.5v, so it would appear to be fully charged.

The old agm, at the end of absorption, absorbed 0.8a for both 13.7v and 14.5v.
Why these difference on new battery? 
I can see all these parameters on the victronenergy smartshuunt.

francesco asked
francesco commented ·

2 Answers

Victron SmartSolar(150/35) + SmartShunt(500) for FullRiver DC400-6(AGM)


I am reaching out because I really need help configuring the Victron SmartSolar 150/35 and the SmartShunt 500A for my 48V AGM-battery (8 x Fullriver DC400-6).

Since I live in Norway and charging is very limited in the period from November - February this is tricky!

I have a potential for (theoretical) 33,6A solar charge with my six 325W panels (3s2p), but in the mentioned period I rarely see much current (aprox. 4-6A). So if I follow recommendations with 3-4% of C20 (415Ah) for my batteries I will have a problem with SOC calculations in the shunt. As I have understood the shunt will estimate a 100% SOC when 3 conditions are met: Charged voltage, tail current and charged detection time.

In my case the voltage for charging will be high enough to achieve "charged voltage" every day (because of my 6 panels), but the current will in periods be as low or even lower than the tail current setting if 3-4% (C20) is used. I'm afraid this will result in a very inaccurate SOC calculation..

For the Smartshunt I need help configuring the following settings:
- Charged voltage? Here I have seen that 0,8V below float is recommended, while others recommend 0,8V below absorption for Solar - what is correct?

- Discharge floor? For AGM I believe this value should be no lower than 50% based on what I have read - correct?

- Tail current? In my head I would have to set tail to 0,8% - 1% or even lower and adjust this to about 2% or slightly higher as charging gets better from mid February - sounds resonable?

- Charged detection time? For the charged detection time I have read that 8-10 min would give a better calculation than the default 3 min for solar charging with low current - correct?

- Peukert exponent? Here I have no idea what to configure, all my reading suggests different options so please help me.

- Charge efficiency factor? The only thing that is certain is that the standard 95% must be way too high for my system, and maybe 70-80% would be more correct?

- Current threshold? I have no clue what this means and need help

- Time-to-go averaging period? I have no clue what this means and need help

For the Smartsolar I need help with these settings:
- Temperature compensation? my batteries says -4mV per cell, and eight
6V batteries in series would then be -96mV according to my calculations - correct?

- Re-bulk voltage offset? Here I have no idea what to set and need help

- Maximum absorption time? My batteries should not be in absorption for
more than 8 hours, so maybe the default 6 hours is ok?

- Tail current? Here again I have no idea what to set because of the
varying charging conditions. My Fullriver batteries only have info of
the state when absorption changes to float: I = 0.012 - 0.02 x C20.

If I understand this correct the tail current will taper down from 8,3A
(0,02x415) to 4,98A (0,012x415). My main concern for this is that I
rarely see 8A charging in the darkest period of the year.. The default
value set on the SmartSolar is 1,0A, will it be OK to leave it at
default and max the absorption out to the battery max rating at 8 hours?
I will let the SmartSolar use "Adaptive mode" for Absorption.

I am really sorry to bother you guys with all my questions, but I know the knowledge is in this community and I haven't been able to get any reasonable answers from the "experts".

I would highly appreciate it if anyone could help me.

Thanks in advance!

kennethknashaug asked
kennethknashaug commented ·

1 Answer

10Ah AGM equalization MPPT75/15

Hey everyone

For a small off grid project (IR movement sensor and a connected 10W led light) I bought a 120W PV Panel and the MPPT 75/15 Controller. Those are connected with a 4Ah WET Lead Acid or a 10Ah AGM Battery.

Seems overkill I assume :-) But the thing is, the place for the PV panel is far from optimal. Direct sunlight for only 3 hours max.

I did some Tests today and I observe things I do not fully understand.

The Battery (yt12b-bs) I took from my motocycle was not charged since October 2020 and was quite low (11.78V). The Battery says normal charging at 1A, fast charging at 5A. I therefore kept the basic settings of 5A on the controller and started the process.

After a short time the controller switched from Bulk to Absorbtion later to float. After I disconnected the battery and gave it some time I could watch the voltage drop way below 12.7V.

I played with the settings and first of all set a max current of 1A. Now it spent way more time in Bulk state, eventually changed to Absorbtion and later to Float.

Once again disconnecting the Battery I still saw it fall back lower than 12.7V.

I read a bit about the equalisation mode and thought I'd give it a try. The settings on the controller are still at default (16.2V EQ Voltage) I put everything together and watched the controller.

I'm confused as the Voltage sent to the Battery never reached 16.2V It was stuck at the Absorbtion Voltage of 14.4V I then set the Absorption Voltage to 14.6V and saw the Voltage rise to exactly 14.6V (low amperage of 100mA in Eq mode)

My first question is: Am I wrong expecting to see a equalization Voltage to reach the configured 16.2V? Did I get the Idea wrong?

Secondly: The Voltage on Battery was constantly falling until it hit 12.35V where it stays right now.
Do you think this block is still usable? Oder might it be over with this one?

Thanks in advance

Best Regards

mauam asked
mauam answered ·

3 Answers

Which battery preset to use


I just purchased a 75/15 mppt for my solar panels. I am just wondering what the best preset of settings i should use with my twin century C12-105DA agm batteries.



Edwin Petersen asked
Fahad Khan answered ·

2 Answers

Super Cycle Smart Shunt Settings Advice

Hello there,

I have recently purchased a Victron 230Ah Super Cycle AGM battery and hooked it up to a Victron Smart Shunt. I am wondering what settings are best in the app for the shunt. Any advice would be helpful.

From what I have learnt from the Victron advice video:

Battery capacity: This is set correctly to 230Ah

Charged voltage: This should be set to the "float charge" voltage as per the Super Cycle data sheet which is 13.5-13.8V minus 0.2V (for all 12V batteries). So, it should be set to 13.3V - correct?

Discharge floor: 50% is correct for a AGM

Tail current: Is okay to remain at 4%

Charge efficiency factor: Since, I will be discharging this battery mostly to about 80% or so most of the time. As per the mentioned above video should be changed to between 80-85%.

Any other settings seem to be fine to keep as they are.

What do you think? (current settings in pic below)


nightryder7 asked
nightryder7 edited ·

0 Answers

Battery preconfiguration choice


I'm using a 75/15 Smart in VW California 2020 which has 2 Varta AGM batteries (see pic below).

What battery preconfiguration should I select? The default one is "gel Victron deep discharge 2" but I see a "AGM spiral" option. Should I change it?? Many thanks!



cebonvieuxmaxou asked
Stefanie answered ·

1 Answer

Mid-point voltage deviations occasionally when discharging, but not always?

I have 4 12v AGMs wired in parallel/series for 24v bank with their midpoint monitored from my BMV-712. In the past month or so, once or twice a week I get a midpoint voltage alarm when I discharge below 74%.


The batteries are less than a year old and I think I've taken care of them pretty well, never getting them below 60%. It's very weird that the midpoint voltage doesn't deviate /every/ time my bank is discharged, only some times. For example, in that graph the midpoint voltage was totally fine on the deepest discharge on february 12. In addition, I am sampling from one of the two series midpoints, and it is not linked to the other one because I read here that it could be bad if one of the batteries totally fails. Should I try connecting the two midpoints? Or is there anything else that might be causing his behavior? The batteries never get below 45-degrees.

vulture asked
neoneddy answered ·

2 Answers

Best settings - getting confused

I have completed my install of

  • MPPT 100/30 controlling 2 -170 watt panels wired in series
  • BMV-712
  • And 4 Victron 6V/240Ah AGM Deep Cycle BAT406225084

My problem is figuring out the best settings on the MPPT and BVM. In all my reading I am more confused, much less the fact on the MPPT there are two options for the Victron deep discharge and an AMG. Not to mention on the BVM things like Peukert, charge efficiency, ect.

I just spent a lot of money on all of this and want to get the most out of it and the best battery life.

timdoring asked
timdoring answered ·

2 Answers

AGM with Orion Smart TR 12/12 18 charge current and temp compensation

According to the datasheet of the AGM batteries the charging current without temperature compensation must be limited to 0.2C. When charging a 60Ah AGM with the smallest Orion Smart Tr 12/12-18 the chare current will be 18A or even higher at normal temperature. This corresponds with at least 0.3C. The system will be put in a relative small compartment so I expect that during charging the temperature will rise to 30-40 degrees. Because the Orion Smart does not support temperature compensation and adjustable charge current this seems a less optimal combination. Is there a better solution?

My current thougts are to use a MPPT charger and connect a 12-24V DC/DC converter to the PV input. The Smart MPPT has options for temperature compensation with an external sensor and adjustable charge current setting.

campervan asked
yann-berry commented ·

0 Answers

Field Test on PV Romania: Problem ?


This month there is too much problem on the PV field test. As seen on the image Mono, Split, Poly production is reasonable but Perc is total failure.

Because of this problems it is hard to believe Total Solar Yield field is correct or not ?

I think there is a data integration problem .

Maybe resetting it for this time period and starting over can be more helpful.

Monthly Periods can be more sensible

Also if you supply monthly total stats for past months.

This is a good real life study one of a kind hope it continues.

In my opinion. Thnks. Victron.

heraktitus asked

0 Answers

AGM Supercycle temperature compensation settings


I have 2 brand new AGM supercycle controlled by a Tristar TS-60 in diversion mode (Windmill + solar).

I want to set the temperature compensation in the controller, but I didn't find any data in the one page datasheet of the supercycle batteries.

Could you tell me the median temp for no temp modulation (I used usually for flooded or gel 20°C or 25°C) and the Temperature Compensation (default in controller -0.030 volts)

The batteries does not seems to charge easily (very often in bulk, need very strong power to get in absorption and float), but with the same charging power I successfully used for 8 years 2x victron Gel...and I suspect temperature comp. to be badly set for theses new batteries.

Thank you


oliv56 asked
oliv56 edited ·

3 Answers

Battery Protect 12/24 220A - No Settings to support AGM typical low voltage cut-off recommendations?

We need to protect an off-grid solar system that is primarily used to power an 240VAC 80W sewerage system aerobic pump that is supposed to operate 24/7 and at least 4 hours per day in unattended use (private camp-ground). The battery is a Eclipse Power 280AH Deep Cycle AGM. We have purchased a Battery Protect BP220 to provide a low voltage cut-off to inverter however I notice that the highest low voltage cut-off on the BP220 is only 12.0V [Setting 8]. This is way too low in my research which should be 12.5 to 12.8V. When there is poor light or after use at night, we need the battery protect to kill the load until the batteries are charged sufficiently. Am I using the right product? Are there alternate settings?

Cycle Use Initial Charging Current less than 75A.
Voltage 14.4V~15.0V at 25oC (77o F)
Temp. Coefficient -30mV/oC
Standby Use No limit on Initial Charging Current
Voltage 13.5V~13.8V at 25oC (77o F)
Temp. Coefficient -20mV/oC

andrew-heath asked
andrew-heath edited ·

0 Answers


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