powerassist Image


Dynamically adjusting ac grid point in ess.

Hallo Ladies and Gents,

I will keep this short because I lost the form while submitting, unfortunately.

When turning on ESS you will also be turning of powerassist, though this is a function I still would like to use on certain times.

I noticed when changing the AC Gridpoint to a negative you will send back power however when it is in the positive it will charge the battery; if there is a need for that. When keeping it at 0 it will stay as idle.

I would like to use node-red to change the AC Gridpoint depending on the current load of the house; with an external sensor so this can happen each second, or even more often or less often.

But is there any concerns when changing this often? Like wear of the flash storage memory, can cause issues with the inverter (because a lot of changes in a short time)?

Are there better ways to handle such situations, in short I want to:

1. Be able to charge the battery when it's cheap.

2. Being able to assist my current load when the power prices are high (so using 100 watt I want the gridpoint to be -100w).

3. Being able to discharge the battery back to the grid company when I want.

Is this the way to go? Any suggestions I would love to hear them even if it differs from my current way of doing things, would love to hear feedback! Thanks!

Laurens D asked
tom w commented ·

3 Answers

Power Assist

I am at the very end of a marina dock where the single 30amp plug is dropping to 105volts when running heavy loads, i.e. water heater. I have VRM configured and downloaded the .rsvc file from my Cerbo GX, firmware v2.92. Multiplus 3000/12/120 with 960amp-hr LiFePo batteries. I'd like to know the effects of Power Assist, will this get my voltage back up to 115v to make running ice-maker viable, concerned about effects of brownouts. Consider me just above a newbie and away from any type of installation support, i.e. Bahamas.

Graeme Walker asked
Kevin Windrem answered ·

5 Answers

powerassist questions and am i crazy?

so still very much a novice here [and note i'm using these items for USA so either 120VAC 60hz or 230-240VAC 60 hz] but i want to make sure i understand how powerassist works. both the MultiPlus-II 3kVA 120V and easysolar-II GX [230VAC] 48/3000/35-32 manuals say "the Multi can add up to its rated power (e.g 3000 / 230 = 13A) to the output during periods of peak power requirement. Together with a maximum input current of 32A this means that the output can supply up to 32 + 13 = 45 A" even the easysolar says 'multi' i guess they just copy/paste.

since it does not have an explicit example for the MultiPlus-II 3kVA 120V we might assume it would be 3000/120 = 25A? however, skipping the possible 3000VA and only using the rated 2400W would it be feasible to output 2400W of 120VAC from the MultiPlus-II 3kVA 120V into a step up transformer to 230VAC and put the output transformer into the easysolar-II GX 48/3000/35-32 so that, ignoring losses, the easysolar can have an out put of 4800W [2400 from mutli and 2400 from easysolar]?

furthermore, if the MultiPlus-II 3kVA 120V is plugged into a 15A 120VAC grid outlet [eg shore power] then the multi could deliver, again ignoring losses, 4200 watts through the transformer to the easysolar? and then the easysolar could output 6600 watts?

back to kVA vs kW how close can either the multi or easysolar's 3000VA get to 3000W? and for how long? i ask because it is my hope to power a 7.2kW charger for my EV. granted the charger is rated at 240VAC so running it at 230VAC would lower it to 6.9kW. from above just using the rated watt power the combo of 15A 120VAC shore power + multi 3KVA and easysolar 3kVA can put out 6.6Kw [1800+2400+2400], how close to and under what conditions could i get to the theoretical maximum of 7.8kW [1800+3000+3000]?

assuming all of the above is fine, anyone have any experiences with step up transformers? if i want to transform 4200 watts at 120VAC to 230/240VAC would a 5000 watt unit be enough and what kind of efficiencies should be expecting/looking for?

rustythorn asked

0 Answers

Avoid Grid injection as Battery is not full and could accept more power to charge faster.



Here is the issue, as you can see on the picture, battery is not full, and more solar power could be injected in the battery, instead of being wasted in the Grid.

If I cut the grid, then all the available power goes to the Battery, how can I change the max power?

frantzphilippe asked
Thierry Cortassa (Victron Energy Staff) answered ·

3 Answers

Power Assist Settings for Multiplus 3000

My understanding of the Power Assist setting for a Multiplus inverter/charger is that you're supposed to set a factor (between 0.3 and 2.0) that, if multiplied with the input current limit, gives you the extra amperage "boost" taken from the batteries. So, for example, assume you set 16A input limit and a factor of 0.5 your system delivers a maximum of 16A * 230V + 0.5 * 16A * 230V = 5.52 kWh of energy. So far so good. Is there a way to set a maximum amperage in absolute terms instead of a factor that then gets multiplied by whatever input limit you set?

For boaters like myself this would be a welcome feature as depending on the max. amperage supplied by the marinas' power pedestals or by the onboard generator, the input limit constantly changes.

romeobravo asked

0 Answers

Is it possible for the 5KVA MultiPlus -II to draw maximum power (9KW) without PowerAssist?


Reason being, when the 2 loads are connected, 2 machines (LO5 Screw Air Compressor & Oven) and the grid is off the MCB for L1 is tripping, This happens so quick that it's not displayed on the AC consumption graph on the portal, however before tripping i can see it's drawing a power of +15KA also L2&L3 MCBs don't trip.

In the Victron Energy Blue Power manual page 10 it says for a 5KVA a 50A rated MCB must be used, can I up the MCB rating? (I think not but it's just for a few seconds for the initial intake draw) or I can still use a 50A rated MCB but with a higher breaking capacity (from a 10KA to a 15KA) will that help?

Here's the connection:

It's a three phase system with 5KVA| 70-50 MultiPlus-II Victron Inverters using a Freedom Won Battery LifePO4 Lite Home 52V 20KWH. From the battery it goes to the busbar from busbar to the 50A MCB (for each line) from the MCB to the inverter.

Thank you

Lindsay asked
Lindsay commented ·

3 Answers

Power Assist Boost Factor and overloading MutiPlus

I have a 12/3000/120 MultiPlus and I'm trying to understand some Overload issues that I'm experiencing and wondering if the Boost Factor is potentially causing the issue.

Setup is as follows:
Input Limit: 30A
Power Assist: Enabled
Boost Factor: 2.0
UPS: Disabled
Input Power: 4500W Inverter Generator (3800W running)

I've noticed when a large load comes online that the MP will overload and disconnect. I also get an error from my EMS that the voltage has gone "out of spec" (sadly it doesn't tell me which way). What is interesting is that the load is under the 30A input limit and can easily be handled by the generator alone. I'm wondering if the MultiPlus is "preparing" to power assist approximately 7200W (Boost Factor * Input Limit) and causing the overload itself?

If I set the MP to "Charger Only" the Generator can handle these loads just fine. So it seems to be something specific to Power Assist causing the issue. I do plan on turning down the Input Current and running this same test to see if Power Assist successfully assists without disconnecting but I haven't ran this test yet.

Should I lower the Boost Factor down to 1 (or maybe even lower) to stay within the 3000W that the MP can provide? Is there anyway to configure this so that it is not reliant on the input limit? For instance if I'm connected to 15A power I would want a higher boost factor.

Thank you!

Jared Wellman asked
JohnC commented ·

3 Answers

Multiplus goes into Passthru when AC-IN overloads


I've a system containing 2 Multiplus II 5000, a couple of MPPT, Cerbo GX and Pylontech batteries.

The system is configured as Single Phase parallel System and all load is connected to AC1 out of the Multiplusses.

PowerAssist is active and also a AC Input Limit of 30A is configured through VictronConnect (with MK3 Adapter).

ESS Assistant is loaded onto both Multiplus.

ESS Mode is configured without battery life with a minimum SoC of 20% in the Cerbo.

Every device updated to the newest Firmware.

When the SoC goes down to 20% the Multiplusses start using energy from Grid. They are in Bulk mode.

That's what I expected.


When the AC Load is higher than 30A the Multiplusses go into Passthru mode.

This is what I don't expect.

What I would like instead:

When the AC load is higher than 30A the Multiplusses should use 30A from AC-in and use the rest from the Battery. When the load is going back under 30A the Multiplusses should fill up the batteries back to 20%.

klandos asked
tnt369 commented ·

6 Answers

The 30a RV Power Control/Assist Dilemma

I have been researching and mulling this over for quite some time. Most van installations use a 30 amp service and don't have a ton of big appliances. Due to the limited space, a combo panel like the PD5000 is a great option, and it is meant for a 30 amp RV.

Now if i build out a van and use a Multiplus 3kva inverter, I want to set it up to take full advantage of power control and power assist, which in a van would generally mean plugging in to a 15 amp outlet and dialing back the power control setting to 15 amps or less. Most van owners are using an adapter to plug in there 30 amp inlet to a 15 amp outlet. Plus, many installs don't even have an ac unit and therefore the demand for 120v current is not huge, rarely exceeding 15 amps total at once. But it can happen.

Now the power control and power assist feature are probably much more straightforward on a boat in a marina or a 50 amp rv, but for a 30 amp van that goes from plug in to plug in, as an installer I am trying to configure the best setup with the Multi.

Via power assist, the inverter can add up to 25 amps total to the shore supply. If plugged in to a 30 amp service, then a 50 amp (55 really) breaker would be required on the multiplus output/main panel. If using power control down to 20 amps, a 45 amp breaker is required, and if dialed back to 15 amp service, a 40 amp breaker is required to give the multiplus the required headroom.

The dilemma is that on 15 amp service you want the power assist boost factor at 2.0, but on 30 amp service you want it at 1.0.

I haven't found a solution other than to use a bigger distribution panel, for example the WFCO8930/50, but it's overkill for example where you only have 2 120v circuits + main breaker, and 4-5 DC circuits.

Not to mention a retrofit on an existing 30 amp RV, where it's really tempting to just swap out that 30amp main for a 50 amp breaker. But the question is, is it safe?

In a van, the answer is almost always yes, since the loads will never actually draw 30 amps of power, let alone 50 amps even, and the power assist exists simply to satisfy the need on 15 amp service.

But I really am looking for deeper discourse on this topic than I have been able to find so far.

joeccv asked

0 Answers

PowerAssist not working after FW upgrade

The central component of my system is a Quattro 48/10000 (2653) and after upgrading to the latest FW version (500) the PowerAssist function is not working anymore. In the scenario below, I've set the Input Current Limit to 6A, and still the Quattro is taking 7.8A from the grid. I've double checked all the settings (see also attached screens) and I cannot find any other root cause than a buggy FW. Anyone else is having the same issue?






cristimv asked
Warwick Bruce Chapman commented ·

1 Answer

PowerAssist how does it work? Boosting starts well below Current Limit! Batteries cant charge! help!

Theres a foot of snow and its freezing out. I need to heat multiple buildings to keep pipes from bursting. And though my hydro (shore) power is producing ~30amps the "power assist" keeps turning on at about 50% of my current limit rather than as the description says, to supplement power demand after the 30amps! (Quattro: 2x10Kw (240V SplitPhase)

State A: Load near Limit - battery discharges at 2Kw! (1000Watt available load)

Battery State: 45% SOC and Discharging

Input Current/Limit: 16/29Amps (3800W / 6960W)

Output Load: 6000Watt

State B: Load around 50% - battery doesn't charge! (2500Watt available load)

Battery State: 45% SOC and Float

Input Current/Limit: 18/29Amps (4500W / 6960W)

Output Load: 4500Watt

I've tried changing the power assist boost factor value from 2 to the minimum of 0.3 which I would assume is 9amps. Isn't it supposed to give me an additional 9amps? so I can boost up to 39amps but have a load of up to 30amps?

Well I have a consistent load above 15 amps and the quattros keep draining from the battery rather than using the available load!

Now that my batteries are below 50% the occasional load spike will shut off the quattro system! And the batteries are continuining to discharge. By the end of the weekend the system isn't going to work anymore! I would be better off without the quattros! (and this has been pretty much my entire experience w/ the product).

Florian Mettetal asked
snoobler answered ·

1 Answer

Power Assist Limit on a Quattro 10kVA

Does anyone know, if is possible to take from a three phase sytem of 3 Quattros of 10 KVA each, over than 270A for 5 sec with the power assist Function?

The idea is not trip the grid protection by using the battery bank, and starting an emerson compressor of 15 HP.

I'll like to know if i can drawn 2 times the power of the quattros for this short time.

Harold Lopez asked

0 Answers

Comment parrametrer MultiPlus-II pour implémenter les fonctions PowerControl et PowerAssist et optimiser l'autoconsommation grâce à une sonde de courant externe 100 A : 50 mA.

Bonjour ,je souhaite optimiser la production sur l’autoconsommation en journée en me servant des batteries qui compléteraient le manque de puissance sur de courte utilisation. Ex sèche cheveux, Grille pain, lave vaisselle .....

Par la suite le surplus serais renvoyé dans les batteries qui sont déjà programmer pour être rechargé en journée et déchargé le soir SOC 70% à partir du moment ou il y a plus de production suffisante pour couvrir le besoin.

Actuellement la production est consommée et le surplus renvoyée sur le réseau une fois les batteries chargée à 100%. Le réseau compense, le manque quand il y a une demande plus forte que la production solaire.

J'ai le Transformateur de courant de 100 A : 50 mA pour MultiPlus-II qui permet d'implémenter les fonctions PowerControl et PowerAssist et d'optimiser l'autoconsommation grâce à une sonde de courant externe mais je ne sais pas comment faire la programmation.

Je suis sur un multi-plus II ,venus GX, sur cette configuration réseau.


Merci pour votre aide.

florian17000 asked
rvtx commented ·

5 Answers

Power assist with 80a shore 3 phase

Is it possible to increase the power assist only from 80A on a 15kw quattro or would you need to install 2 inverters in Serie?

Combined loads between AC1out and AC2 out can reach up to 100amp for short bursts and I would like to use power assist above 80a

mcwidowmaker asked
mcwidowmaker answered ·

5 Answers

Multi RS Solar 48/6000 Power Control

I have been looking at the Multi RS Solar 48/6000 Power Control setting in the manual and cannot fine the minimum 230 volt input current limit lowest setting. In the Technical Specifications of the manual I cannot see it . I have seen the input current limit in the manual for my MultiPlus-II 48/5000/70-50 which has a current limit settings of 6 A – 50 A

Does anyone know what the lowest "maximum current" setting for the Multi RS Solar 48/6000?

bolie asked
wkirby answered ·

2 Answers


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