charge current limit Image

charge current limit

Increased current when simultaneous charging and discharging

Can I increase charging current when the li-ion battery is being used (allows charging simultaneously) or does that harm the battery

Corvalan asked

0 Answers

How to Limit DC-DC Charger Current on Orion-Tr Smart?

Hey Victron community!


First time posting here, so forgive me if I'm missing any formalities.


I recently bought a Victron Orion-Tr Smart DC-DC Charger Non-Isolated 12/12-30. We are planning to use the charger in a travel trailer with a custom 300ah battery bank. The problem is that we want to wait to upgrade the OEM positive wire from the tow vehicle's battery (it is currently a 10awg wire) to a much larger wire until after we start using the trailer. Per my research, we will need closer to a 2awg wire, which is much bigger and a pain to re-route from the tow vehicle, so hoping to kick the can down the road a little.


With that said, is there a way to limit either max current or max power output on these units? Or is the only way to limit it via limiting the voltage? Are there any tricks to artificially limit the current?


Thanks in advance!

dirtjackson asked
ronhanson01 answered ·

3 Answers

Orion dc dc charger

I have just installed the Orion-tr dc dc charger 360W , I thought the alternator could handle the load but apparently it can't, the charger killed my starter battery in 5-10 min whist the engine was running, it cycled on and off as the voltage quickly went up and down. The starter battery is just a box standard lead acid battery and the battery bank im trying to charge is a lithium bank, changing the alternator is no small job to replace as it's pretty well integrated into the engine, so my question is ... is there custom firmware available to allow you to choose the charge rate ? I thought this option would have been there as standard but maybe it can be added in a future firmware release ?

Update * the alternator is rated at 60A

Taz10002@hotmail.com asked
Taz10002@hotmail.com edited ·

0 Answers

Multiplus 24/5000/120 settings: search mode, max charge current, input current limit

Hi,

I have the above Multiplus, BlueSolar MPPT 100/30, 2x200W/12V serial PVs, 2x200Ah/12V serial AGM batteries, Honda EU2200i generator and have the following questions about three settings:

1. If I have both the search mode and AES switched on, which is over-riding the other or can they work together?

1. For the 400Ah/24V battery set it doesn’t seem possible to set the maximum charge current as low as the generators continuous output 1800W/230V=7,8A. The lowest setting is 25% of something (percentage of what is still unclear? Maybe 100A x 25% = 25A?).

3. The input current limit can only be set to the following values:6,3A (1.4kVA at 230V),10A (2.3kVA at 230V),12A (2.8kVA at 230V),16A (3.7kVA at 230V),20A (4.6kVA at 230V), 25A (5.7kVA at 230V),30A (6.9kVA at 230V), 50A (11.5kVA at 230V). The question is how this setting affects the charging on different loads. It is clear that I should not have this setting to more than the generator’s continuous output power. But is it so, that 1) at no load the genset is charging with current of the setting (e.g. 6,3A), 2) when there is load up until the setting (6,3A), the load will be supplied 100% by the genset and the rest is used for charging and 3) when the limit setting (6,3A) is passed then the load will be covered by the genset AND the batteries and no charging will happen?


Thx.

Dosse asked

0 Answers

Multiplus 24/5000/120 settings: search mode, max charge current, input current limit

Hi,

I have the above Multiplus, BlueSolar MPPT 100/30, 2x200W/12V serial PVs, 2x200Ah/12V serial AGM batteries, Honda EU2200i generator and have the following questions about three settings:

1. If I have both the search mode and AES switched on, which is over-riding the other or can they work together?

1. For the 400Ah/24V battery set it doesn’t seem possible to set the maximum charge current as low as the generators continuous output 1800W/230V=7,8A. The lowest setting is 25% of something (percentage of what is still unclear? Maybe 100A x 25% = 25A?).

3. The input current limit can only be set to the following values:6,3A (1.4kVA at 230V),10A (2.3kVA at 230V),12A (2.8kVA at 230V),16A (3.7kVA at 230V),20A (4.6kVA at 230V), 25A (5.7kVA at 230V),30A (6.9kVA at 230V), 50A (11.5kVA at 230V). The question is how this setting affects the charging on different loads. It is clear that I should not have this setting to more than the generator’s continuous output power. But is it so, that 1) at no load the genset is charging with current of the setting (e.g. 6,3A), 2) when there is load up until the setting (6,3A), the load will be supplied 100% by the genset and the rest is used for charging and 3) when the limit setting (6,3A) is passed then the load will be covered by the genset AND the batteries and no charging will happen?


Thx.

Dosse asked

0 Answers

How to limit charge current in the system with old MPPTs (VE.Can), ESS?

Hello,

Does someone have an idea how to limit a battery charging current in a system with old version MPPTs VE.Can (with a built in screen)? The system is running in ESS mode. DVCC (limiting charge current) doesn’t work with this type of MPPTs.

Thanks in advance,

Vyacheslav

Vyacheslav Denysenko asked

0 Answers

Cooling MPPT 75/15

I have a motor home fitted with 2x 100w solar panels charging a 12v LiFePo battery through a smart solar 75/15. Because the panels are horizontal on the roof and sometimes in the shade then never reach their full potential. Best ever is 140w.

I am thinking of adding 2 more 100w panels and making a 2 parallel 2 series config. This will keep me within the range of the MPPT @24v but it will likely mean that there could be several occasions when the battery charging current at 12v will be limited to the 15A max.

I read in another post that this may cause heating of the MPPT and that a small pc fan would be a good idea to move the air around.

Could I connect a suitable fan to the pv input terminals so that the fan is only running whilst pv is present? Of course I would use a fan rated for such variation in voltage. This would eliminate the need for some kind of switch, either temp or time.

KevP asked
Scubadoo edited ·

5 Answers

Solar charger sizing query.

The voc of my 3 x 245w panels is 159v, would I be right in thinking i can connect my panels in parallel and use a 150/70 charge controller? I'm running a 12v system.

Thanks in advance.

Frosty asked
bigboy529 commented ·

5 Answers

Sustain current too high?

Hello Victron fellows,


I have set some Li ion with Victron inverters, always for self consumption with PV inverters, but this one is cracking me up. This system consists in three 48V Multiplus II 3000/35 as a three phasic system, and an ESS assistant is set. The sustain voltage is 43V and cuttoff around 42V. The modules have a low SOH, but the system should work anyway. It charges and discharges correctly, up to the point where my BMS disables allow to discharge at around 48V, because there are low cells (it should discharge to less than 42V if it was good).

Then, Sustain mode is active and the current goes UP TO 90A. Of course when this happens the voltage raises quickly, the allow to discharge comes on again and it goes to Discharging mode. Repeating the process endlessly - Even without PV POWER, that means it consumes a lot of power.

My question is, why does it go up to 90A, since sustain mode should be 5A per unit and how can I solve this?

Thank you very much!

Jorge Folgado asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

450 watts with SmartSolar MPPT 100/30?
450 watt solar on 12v system with the VICTRON SmartSolar MPPT 100/30 or 100/50?

I would save $130 with the 30 over the 50 and considering I have no income in the foreseeable future thats appealing haha.

The manual says up to 440 watts with the 30 but I have seen places selling it list up to 450 watts. I have 3 x 150 watt panels for my new system and right now just a Renogy 30 that does 400 watt so need something but can't spend a lot.


400Ah (2 x Renogy 12v Deep Cycle Batteries)

450 Watt Solar (3x150) - the most I can fit mounted on my van roof, I will NOT be expanding to more panels. https://www.amazon.com/gp/product/B07WV6P4BT/ref=ox_sc_act_title_3?smid=AV16HZDTPF1LD&psc=1

W/ Wirthco Battery Isolator adding power also


endy asked
endy edited ·

1 Answer

Control Charge Current OffGrid System

Is it possible to use the register address 2705, DVCC system max charge current, or any other modbus register to control the charge current on a offgrid system? Do I need to add any further assistant?

Thanks

Tony Towers asked

0 Answers

Charging my LifePo4 with an alternator

Hi,

I am designing my setup but the only thing that is not clear to me is how to safely have my batteries charge through my alternator.

The battery will be a LiFePo4 battery, 12V 600Ah.
Inverter/charger Victron Phoenix 12/2500/120
700W of Solar through SmartSolar 100/50

I am still deciding on the BMS. My van is a 2006 Renault Master, so I'm pretty sure it's not one of the newer "smart alternators".

From what I can find online it looks like there might be a way to use either a BMS or a VE.Bus BMS to do this? I would like the alternator to be connected to my starter battery at all times, and connect a system to that that
A) Doesn't destroy my alternator
B) Doesn't drain my starter
C) Shuts off charging when battery is full

Has anyone already made a setup like this?

Thank you!!!

shivadas asked
shivadas commented ·

3 Answers

How to set charge limit on a MultiPlus?

The charging current in the multiplus compact is 80 amp. The information on my Renogy 170ah lithium battery says 50amp for maximum charging current. Can I adjust the charging current in the multiplus compact?

Inhabor asked
Grog answered ·

4 Answers

controller clipping threshold under load

If I have an array that is producing 1kW connected to a Victron charge controller that can handle 600 watts charging a 24 volt LiFePO4 battery and is also a 800 watt load, will the charge controller be clipping because 1kw is going thru it, or do you subtract the 800 watt load from the total meaning that the charge controller only has to handle 200 watts? In other words, can I set a priority in the charge controller to pass current to the load first and then use whatever is left (if any) to charge the battery. And in such a system, does the charge controller clip only when the total charging current is greater than 600 watts, or when the total is greater than 600 watts.

Scott Harris asked
Matthias Lange - DE edited ·

1 Answer

CCL and DCL always changing between 35A and 70A

Hi


I have 2 BYD 2,5kWh modules, that each have a 35A Charge Current Limit (CCL) and Discharge Current Limit (DCL), therefore, I would expect to see a continuous 70A CCL/DCL for my system.

However, according to VRM, my CCL/DCL are always fluctuating between 35A and 70A:

[image]


It's like this since I installed the system (a few months) and has no noticeable impact in performance (I seem to be able to pull ~50A from the battery, even when the DCL drops to 35A):

[image]


Any idea on what's going on?



BYD B-Box Pro firmware 4.17

Multiplus II 3000VA firmware 459

CCGX firmware 2.42

RuiP asked
RuiP commented ·

1 Answer

400 Watt Panels only Charging 260W on MPPT 100/30

[image]

I was just testing a second suitcase I put together last week. I turned on the inverter and a small space heater on low to provide a load. I ran this test at 12:15 pm in full sun at 7500 ft altitude with no haze. I thought I would produce more watts, but something must be limiting it since I only got 260W running both 200W suitcases. I did note that the battery temperature was at 21 degrees F (using SmartSense), so maybe that is limiting the wattage the solar charger letting through. I let it run for a while and my SOC was 88%.

davidpheteplace asked
Justin Cook - Bay Marine Supply USA commented ·

4 Answers

Limit charge current in ESS system

The system in question has an Octo GX, 15kVA Quattro, 8x Pylon US3000 and 3x 250/100 MPPT's.


Para 4.3.9 (Limit Charge Power) in the ESS Design and Installation Manual states, inter-alia, that: "

  • This setting does not reduce the charge power coming from MPPT Solar Chargers."


I assume the exact setting referred to is this one:


[image]



My observation, however, is that this setting certainly affects the MPPT power if switched on.

For example, see below the severely throttled yield until the moment I switched this setting off again:


[image]


My batteries' SOC at the time was 31% so I expected all "spare" PV power to be directed to charging the batteries.


My goal is simply to limit or even entirely prevent using grid power to recharge batteries.


Am I misunderstanding something about this setting?


Thank you.

jgrimm77 asked
jgrimm77 answered ·

2 Answers

24V Multiplus 3000 auxiliary DC max Amps?

If I read correctly, the 24V 3000 has a 12V dc aux output. What is amps continuous and max amp burst on this?

rvsolartech asked
rvsolartech commented ·

4 Answers

Charge rate limited by Victron charge algorithm on flow / high impedance batteries?

Hi folks,

Does anyone out there know the voodoo behind the charging algorithm or what, other than temperature, could be causing Quattros and MultiPlus's to not reach their maximum charging currents?


Problem

The inverter/chargers are not reaching their maximum charge rate. A cluster of 6 x Quattro 15000 can theoretically push 1200A. There are 45 flow batteries which can each accept up to 50A during charge.

However, test results on this system showed a maximum of 1050A reached which after 5 minutes reduces to 900A which is then sustained. This is only 150A per Quattro. This results in 9 hours to charge rather than 6 hours which should be possible. This impacts the business case for some clients. This was the same on both a 35 degree day and an 18 degree day (Celcius).

The system is running the ESS module. The tester commented that charging fewer batteries and/or with ESS not running he has observed the 200A charging on other systems, but for some reason, it has not been able to be reached in this system.


Ideas

The comparatively high internal impedance of the flow battery being 80 to 100 milliohms (all connected in parallel) may be causing the algorithm to not adjust the voltage high enough to push enough current into the batteries.

What does the "lithium batteries" checkbox in the charger page actually do/change? Again, I imagine this would change some characteristics of the charging algorithm, even if lithium battery is not chosen from the list of battery defaults. Li


Questions

How does the charging algorithm work for the charger in Multiplus II and Quattros?

Is it possible that the charging algorithm would not raise voltage enough either due to high impedance?

or the ESS module somehow altering behaviour?

Lothar Ledgerd asked
MrT answered ·

2 Answers

DVCC Maximum charge current problem

My system: 12V Victron smart lithium 200AH, MPPT 150/60, MP 12V/3000/120, CCGX, BMV702

This is on a mobile unit and therefore is NOT on ESS

I have used VE configure to increase the charger to 60A on the MP and when using the limit charge current under the DVCC settings on the CCGX, it doesn't seem to recognise the MP charger at all. For instance, I can set the limit current to 3A and although it will reduce the MPPT to about 40W and works fine in that regard, when I increase the setting to 80A I only get the max that the PV is producing and no input whatsoever from the charger on the MT. I assume that both the MPPT and MT should provide current to the battery in that scenario with priority for the MPPT. This is not happening.

I suspect the charger may have stopped working as it only seems to be working on ‘Passthrough’

Markblox asked
nbezanson commented ·

4 Answers

Quattro limit charge from grid

Hi folks,


I have a migro-grid system with a 1000VA quattro and 8kw Fronius.

The fronius is fed with 8kwp solar array (over-compensating for cloudy days as I will rarely use all of that power and connected to the mains in the house.

The quattro is connected to a 20kw lead battery bank and also has a genny connected for those really bad days.

During the summer, i only had 1 string of panels connected (4kw) and was rarely charging with more than 3.5kw the battery bank, but today, since connecting the second string, i got at least 6 at some point.


I tried to limit the quattro, but it seems the limit is for AC In only, while my set-up should limit charging from AC-Out.


Any ideas how should enable this limitation?


Thanks!

Romeo



iRomeo asked
iRomeo commented ·

3 Answers

Force a Quattro into Float?

Is there a way (switch, assistant, setting) that allows me to force a Quattro into Float -regardless of state of charge on the batteries?

I hope this hasn't been asked before, but search is not working at the moment (internal server error) so,

Here is my scenario, this deployment is in an RV.

I have a Quattro 24/5000/120 connected to a pair of 12V lithium batteries in series, with a BMV 712 monitoring them.

For half the year, this vehicle is spent "off grid", meaning no constant source of shore power (a generator is used to recharge the batteries).
In that scenario I manually manage the charge of the batteries to ~90% SOC (because evidence is showing it increases their lifespan over a constant 100% SOC). I do that by turning off the generator, and the batteries are allowed to discharge with regular day-usage. Then the recharge cycle is repeated.

That works great, however,

For the remaining half of the year, this vehicle is spent on-grid and has a constant AC input. That, of course, triggers the Quattro's charger functionality and it happily tries to recharge the batteries to 100% (with a *mandatory* and unnecessary 1 hour absorption as a bonus). And it repeats this cycle, anytime powerassist is triggered and the batteries are used temporarily (however little), thus discharging them enough to restart the whole cycle over and again.

I don't want it to do that :)

I believe that to be deleteriously burdensome on my batteries (or any lithiums for that matter), who would be much happier at ~50-60% SOC when operating in this "storage" mode.

And that's my issue.

I want to discharge the batteries to 50% and leave them there, while keeping the Quattro happily plugging along doing its other functions like passing power and power-assisting from the batteries as needed.

Is there a way to accomplish this with my Victron equipment?


I've tried a series of hacks to simulate this behavior. Primarily by using the charge rate assistant with an aux1 trigger switch. But even that, even though the assistant is set to 0 amps, when active, still isn't really 0 amps. It keeps a creeping 1.5 to 2 amps going, regardless - which eventually charges the batteries up anyway. Just slower.

Thoughts?

Thanks in advance for your help.

Geomz asked
Mark edited ·

2 Answers

Control maximal Charge Current from SmartSolar MPPT 150/85 with BMV 712

Dear Victron,

I have installed an oversize PV System in relation to the battery in my car (Old VW T2), which I use to demonstrate PV opportunities in Indonesian rural areas. (https://www.instagram.com/pVwKombiWanderer_t2/). All installation is private financed by us and we try to promote renewable energy to rural places in Indonesia without any payback. But step by step the local media ask us for interviews and talks in the television and we start our blog in Indonesian on YouTube :D

1. The Panels can produce 1,16 kWp under STC. Size was chosen based on the maximal allowed space on the roof.

2. SmartSolar MPPT 150/85 charge my battery with an additional SmartBatterySense and BatteryProtect BP-100.

3. Just one Luminious SMF 12V 200h is installed due to weight and lack of space (I know this is not ideal, but it is an old car and 69 kg for each battery is just really heavy)

4. SUOER FPC D1000A Pure Sinus Wave Inverter (1000W continuous power/2000W peak power)

To increase the maximal life-cycle of the battery under tropical high temperature I reduce the maximal charge current to C10, which means 20A. When I demonstrate it to the people I put some big load to my Pure Sinus Wave Inverter. Since my PV System can easily produce more than 80 A on the 12V site at daylight, I need a device which can change the maximal charge current depends from the load.

The BMV 712 can easily read the current and direction of the current which going in and out of the battery and it can be easily connected via Bluetooth to the other devices.

Is there a possibility to drive the MPPT from the SmartSolar MPPT 150/85 with the measured current from BMV 712 so that the net current to the battery is limited to 20 A?


Or is there another device which can do this which is available in Indonesia, because Victron parts I bring directly from Germany? I didn't buy the BMV on those time due to lack of money, but now because of the response and the interest I need a solution.

It is so great to see the people step by step understanding renewable energy and with my background as a physicist i can explain them a lot :D

I am really happy for any advices or helps.

Thank very much.

Best regards,

Pelangi

pvwkombiwanderer asked
pvwkombiwanderer edited ·

2 Answers

Multiplus II BYD Box Chargelimit

Hello

I have a system with 3 Multiplus II and a BYD L box, offgrid.

My question is :
The standard charging algorithm of the Multiplus for this battery type has a final charging voltage of 56.8V, but the BYD box has only 56.5V. If SOC 100% is displayed in the Colorcontrol, the BYD box switches off although the charge limit of the BYD box is still 40 A. This shows me that the box could still do a cell balancing with little ampere. I think I could continue charging with 56.4 V and a few amps until the charge limit in amps drops to near zero. Can I reduce the final charging voltage of the Multiplus to 56.4 without leaving the charging algorithm of the Multiplus for this battery type? The BYD box could then interrupt charging when the permissible charge limit in amperes has been reached.

Many thanks for the answer

Translated with www.DeepL.com/Translator

wolfgang asked
Guy Stewart (Victron Community Manager) edited ·

1 Answer

Blue Solar DUO Chargers 12/20

2 Chargers were connected to 4 Lead Acid 225Ah Truck-Starterbatteries.
After 4 years of service all 4 batteries are broken.
Discharging was never ever below 12V

I assume that the problem is with trickle charging as lead acid's shall be charged with 14,8V with a bulk(trickle) charging of 13,4V to avoid sulfating.

In fact the Blue Solar Duo chargers can only be set to 14,8/13,7V which is, to my opinion, to much and results in continous charging and by the years continous sulfating with the a.m. breakdown.

OK Truck-Starter batteries were the wrong decision but I think this is not the real problem and obviously I want to avoid the same problem with my new Trojan T125 which are said to need 13,5V bulk-charging.

Though I am very glad for every input that helps me out of this mess.

willi

Wilhelm MOSER asked
Wilhelm MOSER answered ·

3 Answers

Charge control on MPPT / Venus GX; 0A not possible

In my boat I have a Venus GX, an MPPT 75/15, a Multiplus 1600/70/16, a BMV 712 hooked up to a 600Ah Winston LFP bank controlled by a REC BMS (not the Victron compatible version). To the MPPT I have connected 2x100 W solar panels.

I would like to be able to limit/stop charging by solar when I leave the boat for longer periods, (as I prefer to keep the batteries at a SOC below 70%), and have thus turned on DVCC, Limit Charging and set Max charging current to 0 A. The MPPT reports that it is Networked, Slave and ESS mode, but nevertheless produces 1A of current (BMS Controlled is turned off). If I increase the charge limit it works correctly (1A also yields, 1A, 2A yields to 2A, and so on, up to what the PVs produce). The fact that I can't stop charging completely (i.e. 0A) is a bit annoying, as it would be nice to have full control (which I don't have now). The Multiplus is, BTW, turned off (via the Venus), and is usually not hooked up to shore power. Any views, or intended fixes in a future firmware version?

Eirik asked
Eirik answered ·

2 Answers

Victron Easy Solar 5000 and Pylontech US3000 Battery

I have installed a Victron Easy Solar 5000 with two Pylontech US3000 batteries and 12x330 canadian solar panels.

In the beginning the system produced up to 3800 w of power but is seems the installer limited the PV to first 1600 w and then to 2600W.

What would be the reason be for this , since I need more PV for my house at midday.

When I asked the installer his reply was that I need to install more batteries then he can "open up" the system. This seems to me not right.




George asked
Paul B commented ·

2 Answers

Aquion charging at different charge current limits in ESS

I seem to be the only poster with Aquion batteries. I am realising the very best way to deal with charging parameters as I experiment. I am on ESS so grid connected.

I have now changed over to a night /day tariff so all my grid power is night time rate. This is working very well as no grid import in day time even in winter.

My Aquions need a slow charge rate so I limit the charge amps to give me say 2kw and they are charged up each night (8 hours max.) using scheduled charging. This means they can be charged to 100% in only 3 hours if SOC is high but easily fully charged if starting SOC is lower.

Now I want to have a higher charge limit (or no limit) for solar charging via inverter to maximise solar input as this can be intermittant in winter but is there a way to have 2kw charge limit in scheduled charging at night and a higher charge limit (or no limit) in daytime outside scheduled window? I have no DC system of course.

Thanks

freddyuk asked
Guy Stewart (Victron Community Manager) commented ·

2 Answers

Does the recommended charge current of a battery increase if combined in parallel?

Hello all.


I am currently in the process of designing a battery system for a camper van conversion and am looking at using 3 x 90Ah Lithium batteries connected in parallel. This may be a bit of a newbie question but im struggling to find an answer anywhere on the old interweb...


Does the recommended charge current of a battery increase if combined in parallel?


For example for a standard Victron Lithium 90Ah battery the recommended charge current is equal to or less than 45A, if i were to use the three batteries as suggested above could i increase this recommended charge current to 135A (3 x 45A)?


Thanks all for the help.


Tom

rallyestyle asked
rallyestyle answered ·

4 Answers

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