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inverter current draw

Why does AC Input Current Limit reduce when assisting?

I have 2 Quattro 48/5000/70 setup in parallel. No virtual switches and no ESS. Running v501. I am currently connected to 30A shore power. Everything functions normally and I'm receiving roughly 3300W incoming with 250W AC load. The Input Current Limit shows 28.2A in the VRM(I have it set to 30A). When I turn on a heater the AC load increases to 1750w and the shore power drops by the same amount. The input current limit stays 28.2A and it continues to charge the batteries with the spare power. After several hours I'll check back and see that the batteries have drained unexpectedly. At this point the shore power usually shows 500-700W, the Input Current Limit is down to 14.6A, and the battery is being drained while in Assisting mode. For some reason it is limiting the AC Input Current even though it should stay at 28.2A because the batteries need charging and the power consumption is high. The weird part is that If I turn off the heater for 10 seconds and then turn it back on the Input Current Limit jumps back up to 28.2A, the shore power returns to normal, and the batteries begin charging again, Assisting mode turns off.

I determined that it triggers Power Assist mode when I have other loads that push it over the shore power current limit, which makes sense. However, once the loads are gone it stays in Assisting mode and eventually will drain the batteries. Only after shutting down ALL AC loads including my 1500 watt heater does it reset from Assisting back to normal. It's possible that when the Input Current Limit drops to 14.6 it needs the power consumption to drop below that before it releases Power Assist but even if that is true WHY does the Input Current Limit drop in the first place? Shouldn't it use all AC-in power regardless of Power Assist? Why doesn't the Input Current Limit return to 28.2A once Power Assist stops?

For clarification I have a 50A RV and have wired L1 shore power to Quattro #1 AC-In-2 and L2 shore power to Quattro #2 AC-In-2. I then feed Quattro #1 AC-Out-1 and Quattro #2 AC-Out-1 back to the RV transfer switch for 50A. Since I am currently connected to 30A shore power I run in parallel mode but would run in split phase when on 50A. I assume that it is assisting from Quattro #2 from battery when on heavy loads.

jasonsele asked
mvader (Victron Energy) answered ·

1 Answer

UK newbie 'store at night, use in the day' query

Help please,

Given energy costs, in the UK lots of retailers are now selling domestic 'on-grid storage and self-consumption' kits "for storing cheap night-time energy (off-peak tariffs e.g. Octopus) for use during the day", e.g. a kit with Multiplus II 48/5000/70-50 and 14kWh of batteries, "more battery modules can be added at any time", and PV at later date -

With 14kWh of 6000 cycle, 95% DOD batteries I'm expecting to be able to store all my elec need at night (@ 7p/kWh) and not use any grid elec in the day (@ 47p/kWh). When we add solar PV, 5kWp will mean we are mostly self-sufficient for 5 months of the year (according to ). But, with a 4kw inverter the above Multiplus seems underrated for 14kWh of batteries. We typically use 7Kwh night and 7kWh day but with occasional peak demand of 8kW (cooking, kettle etc). The expectation was to have all loads via the inverter - 'critical' on AC out 1 - otherwise the system doesn't pay for itself. Also we're rural and have frequent, short duration power outages and thus need the UPS functionality. Am I misunderstanding something here? I'm assuming that, in the day, all power needs can be supplied by the batteries and thus via the inverter and thus the 4kW inverter seems wrongly matched with the 14kWh batteries?


johnone asked
semlohnhoj commented ·

5 Answers

Can I use Multiplus(first version) 12/3000/120-50 with 200Ah Lifepo4 battery

So I bought components for a camper year ago, but because of multiple reasons get to installing components only now. And in manual for Multiplus(first version) I discovered that minimum recommended capacity is 400Ah.


Initially the plan was to buy two such batteries but now this is not an option.

1. So is it possible to use it with such battery, or it will damage it or wouldn't be function properly? I think currently loads should be not more then 1000 watts

2. Should I set up inverter settings so it wouldn't be allowing to discharge battery more then recommended amount of Amps(not really sure if such thing exist).

kostya asked
kevgermany commented ·

1 Answer

Spec needed, MultiPlus Compact 24/2000/50-50

Hello! I'm considering a MultiPlus Compact 24V, 2000VA, 120V inverter-charger. In the datasheet and/or manual, it is said that the PowerControl function can be adjusted and that the default setting is 30A. I would need to know the actual range of adjustment, especially the lowest possible setting. I could not find the answer anywhere. Thanks!

deromax asked
deromax answered ·

5 Answers

Is there any way i can run a 1.5 Hp motor from my MultiPlus-II 12/3000/120-32 230V?

Hi All,

I'm just trying to size up a Cat pump for my watermaker and want to know what I can effectively run from my inverter.

I have 4 x 12v 200AH lifepo4 batteries with maximum 2540W output (according to the manufacturer).

The majority of motors I'm looking at have a start-up load of around 50A at 1750RPM, Before settling in at about 7A. I'm wondering if I can put a soft start in-line somewhere to bring the start-up load down to a workable range. If not, Is it possible to have a 2.2kva Suitcase generator hooked up to the inverter, allowing the inverter to pull power from the generator and battery bank for the start-up, then turn the generator off to allow my batteries to continue feeding the motor for a few hours to fill my tanks?

Any other suggestions would be much appreciated!

Thank you, Tom

tommyb asked
Kevin Windrem commented ·

2 Answers

Three phase Multiplus-II current transformer shows negative AC-IN


I just installed my Multiplus-II's current transformers for each phase and now it shows for L1 and L2 a negative AC-IN. I have ESS and grid feed in is disabled and I dont have solar power coming. How can I have those numbers be positive?



Also Remote Console shows different AC-OUT.


What can I do? Do I need to buy grid meter?


crimu asked
00schweizi answered ·

1 Answer

MultiPlus-II 48/3000/35-32 Max Output current on ACout1

Can somebody explain to me what is the max current for MultiPlus-II 48/3000/35-32 on AC-out-1 (230V) when only DC battery is connected - no ACin from Generator ?

As for my understanding goes the AC-out-1 current draw should not exceed (2400W / 230V) 10 amps ?

If a 10kW generator (limited to max 32A) is connected and running, is then the max current on AC-out-1 10 Amps + 32 Amps = 42Amps, or am I missunderstanding the logic and the max current on AC-out-1 is still 10 Amps and 32 Amps on AC-out-2 ?

I understand that the DC max current is 35 Amps (35A x 48V = 1680W to charging the battery).

What happens when i connect two Multi's in parallel ? What max Amps can I then have on AC-out-1 and with what max Amps can I then charge my battery bank ?

I have a SimpBMS connected to Venus GX and two Tesle 6S modules in series (12S) with Smart Solar 150/70 TR for solar.


tomskk asked

0 Answers

Transient current cause Seplos BMS to shutdown

Hi Victron community, I have one question regarding a couple Victron / DIY LFP pack with Seplos BMS.

If it is just to say that Seplos is not in Victron's compatibility list for BMS, you can save your time and are not forced to participate to this thread ;)

I use this BMS (I have 4 of them) and it is working fine, but, as there is a "but", a big one, I discovered that using only 1 battery pack (14kWh / 200A BMS) with a 5kVA Multiplus 2 doen't allow it to start as the transient current is too high for the BMS (fixed values in the BMS are 250A for 30mS, not changeable if you don't want to damage your hardware and loose the warranty).

Is there a known solution to limit the starting current on the Victron side?

Else anyone intending using those BMS in a Victron environement must pay attention to this "detail" and better find another model if they don't intend to have 2 or more battery pack.

jeanmarie asked
klim8skeptic commented ·

0 Answers

Power used bt the inverter

I had installed a solar system using the Victron inverter a couple of months ago, whilst I appreciate it's early days and we are into the autumn it is currently generating about 8.5 kWh per day, of which 2 kwh is used to power the inverter and/or "lost" in the conversion from DC to AC – is it about right?

cmh asked
morgen edited ·

2 Answers

how to 12v 1200w Phoenix inverter wire and fuse sizing ?

The manual says maximum gauge wire is 35mm2 or 2awg ? Send a little small for peak power 2400w ? The manual also doesn't have any info on wire fuse size? Do I fuse the wire with 200A (for 2400w) or 100A (for continuous 1200w) ? I emailed Victron North America distributor but did not get any response.

ls13 asked
electrokid edited ·

3 Answers

Multiplus 12/3000 Excessive No Load Current

My new multiplus inverter/charger draws up to 9 amps (110 watts) under NO LOAD condition. When the inverter is first activated, it draws 2.2 amps. Then after two or three minutes, the unit begins to buzz and the current gradually ramps up to 7-9 amps (depending on how long I let it run.) I've measured this with my boats battery monitor and with a clamp-on meter directly at the I/C. I've removed all external wiring except the I/C and the battery, connected by short, new cables. The result is the same. Some other posts describe no-load currents of up to 0.9 amps, but this is an order of magnitude larger. Certainly seems like a defective unit to me, but is there any way it could be mis-configured to produce this result? (Configured by the dealer.)

toddster asked

0 Answers

Inverter efficiency curves

I'm curious to see specific efficiency curves for various Victron inverters I'm looking at, but my searching has been fruitless. I have a 24v system and am looking for an inverter that needs to run only two loads at 220v: one is 30w constant, the other is intermittent and will peak somewhere around 776w. My concern is that the constant 30w load may fall in the abysmal range of the efficiency curve for many inverters. I don't see any way to avoid this, but I would like a rough number of what efficiency I might expect in this scenario.

ppppp asked
sergiuhlihor commented ·

5 Answers

Victron Phoenix 24/500 230V 400W VE.Direct - below specs or broken?

I have bought a Victron Phoenix 24/500 and during testing stage, I found that its performance is lower than specified. So far I have observed the following:

1) Idle load 10-11W > 6.5W from specs.

2) Measured efficiency is peaking at 87% using loads with power factor of 0.85-0.9, instead of 90% as specified.

3) Inverter entered what appears to be overload protection when connected a hairdryer with a measured power of 335W (<400 specified) and a power factor of 0.9, however it was able to sustain a 400W load composed of 100W electronics and a 300W lamp, having a power factor that was again ~0.9.

4) Not able to power the starting phase of a refrigerator compressor which has a continuous power requirements of 60 to 80W and a peak during startup of ~500-700W.

I understand that first 2 points could have their root in incorrect datasheets, case in which a correct one would be appreciated. Honestly, if a producer writes 6.5W idle power and I measure 10, I am wondering what else is not true in the datasheet. However points 3 & 4 look to be some issues, specially 3 . Any advice? or there are some overly aggressive protections built in?

sergiuhlihor asked

0 Answers

MultiPlus drops offline 10 seconds when AC kicks on..

Looking for suggestions-

We have a Kohler 8k marine genset and while running our 16k dometic AC pack, (when at anchor,) i notice that each time the compressor kicks on, our Victron touch screen GUI indicates that our shorepower/Genset feed drops out for about 10 seconds and then comes back online.

The shorepower and/or generator feeds go thought the Victron Multuplus 3k Inverter/Charger as it normally is designed..

This "trip" seems to follow when the compressor cycles from off to on.

Is this an indication that the capacitors on out genset are going out?

Not really sure if these capacitors are used in a way to buffer a spike or not.

I'm not really to sure of I'm close on my thought pattern here but just wanted to ask for suggestions.

Would be glad to hear ideas but I do have the Dynamic Current LImiter set to On and it makes no difference.

Maybe its the water pump cycling on that doing this?

PS, Our Air Conditioning system is 240vac

Appreciate your ideas...

jefndeb asked
klim8skeptic commented ·

1 Answer

RV Inverter Upgrade: 12v vs 24 Inverter

RV Upgrade; The coach has on onboard 4kw generator that will be used to charge the batteries in addition to the 950w solar panel array.

I am going to be running 4x 12.8v 200ah lithium batteries and deciding whether to run as 24v paired with a 24/5000 Quattro or run as 12v paired with 12/3000 Multiplus.

If I go the 24/5000 route I am having the panel upgraded from 30amp to 50amp. The quatrro has a much beefier charger in it and will almost cut charging time in half compared to the Multi-plus so I am leaning that direction.

Other than faster charging and additional power headroom, what else am I not considering as potential downsides or upsides to the 24/5000 setup vs the 12/3000 setup?

duffer41 asked
Kevin Windrem answered ·

3 Answers

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