question

Thank you very much for your response.

Judging from the logic that you have shown, as I understand it, you propose to set a limit of 16A for the input, and then use PowerAssist with a coefficient of 2.0 (I did not understand how much).

Will this allow "mixing" the energy of the battery into the public electricity network?

Where can I read more about this? What does boost factor - 2.0 mean - how much will this% add to the battery?

As for charging by time, it’s clear that many people have this function, and here it looks normal.

Well, about the correct determination of the battery capacity, and not by voltage - probably you need to put a shunt?

PowerAssist - As far as I understand it does not suit me? After all, it is only for the auxiliary, i.e. generator, and if I set a small input current to the entire utility network, then it will be charged with a slow current.

https://www.victronenergy.com/upload/documents/Technical-Information-Achieving-the-impossible-EN.pdf (I would like to use the input limit, and by time, that is, during the day, the limit is 10A, and at night when the batteries are charging 25A = Can this be done programmatically? = During the day 10A, and at night 25A)

I want to "mix" in, say, a set % ratio, without limiting the input current parameters.

Thank you very much for your replies.

https://logicpower.ua/product/19346 - LiFePo4 24v 150A (I have 2 of these.)

8*3.65v=29.2v and 8*3.2v=25.6v ;)

Sorry, I'm from Ukraine (link to the manufacturer), and in connection with the war, there was a need for a backup power source with the most flexible configuration system.

I ran the tests and charging turns off at 29.2v - or if 2 in series then 58.4v. (This is how it is charged with a proprietary charger)

Full discharge i.e. when the BMS is turned off, about 51v i.e. about 25.5v and at the same time the battery gives off all its power. (BMS protection works and turns off the load to save the batteries)

There are a few more questions:

1) Please tell me, is there a "mixing" of battery energy on both load terminals in the city power supply network? Those. and AC1 and AC2? or only on AC1, which works when there is a city power outage?

2) The ESS algorithm is the same and configured, as I understand it, the same, regardless of whether there is a solar field or not? Even if there is no proprietary solar controller, there will be an "admixture" of battery energy - right? So, if everything goes well, then I can then buy solar panels and a solar controller even from another manufacturer (as I understand it, it’s better to take a branded one, a theoretical question)?

3) Please tell me, if the power of consumers is greater than the power of the inverter, but at the same time there is a city power supply network - is overload permissible? Or does the circuit breaker trip and everything turns off?

The fact is that I want to take the 3000 model (powerful backup consumption is usually 500W-2kW, but there are starting currents of 2 large refrigerators and a pair of air conditioners, and now a 2kW UPS is used for these needs) - I rarely turn on the 2kW electric grill in the kitchen and therefore it must be connected to AC2 - it is not used without city power supply - all consumers would like to be able to be saturated with solar energy (this is an electric grill and a microwave oven and others)

Or will I have to take 5000?

You shouldn't charge your battery until it disconnects. The fact that it disconnects indicates that it's trying to protect itself, you are crossing the limit. Even Victron LiFePo4 batteries charge to 3.55V.

Also, at 3.2V there is still lots of energy left in a LiFePo4. I looked at the battery specifications with Google Translate and it says "Minimum Voltage 20V" ... that makes more sense.

MultiPlus-II 3Kva can transfer up to 32A (7.4 kW) from AC IN to AC OUT 1 + AC OUT 2.

When the grid is available, the inverter injects up to 2.4 kW of power into the network so that loads connected at AC OUT 1 and AC OUT 2 use this power instead of the grid. If the loads exceed 2.4 kW, the inverter runs at max power and the rest comes from the grid.

When the grid is not available, then AC OUT 1 receives power from the batteries, up to 2.4 kW
AC OUT 2 is without power.

So you should split your loads into two categories

• Critical Loads - up to 2 kW - connect at AC OUT 1
• Non-Critical Loads - connect at AC OUT 2
• Critical + Non-Critical loads should be max. 32A (7.4 kW)

It would work with other solar chargers, but if you get a Victron SmartSolar, then you will also get integrated control and monitoring into the GX device.

Please see here for more information:
https://www.victronenergy.com/media/pg/Energy_Storage_System/en/index-en.html

Hi, I would go to an old school solution, use a standard relay as grid supply to the multiplus, turn the relais on over a clockwork in the night , with an override on low soc.

First of all, thank you very much for your replies.

I can switch the wifi relay, but this type of automation can also be on cheaper equipment, when buying Victron I want a fully automated and correctly working complex.

1) Please tell me what voltage range can be specified for the transition from batteries to the city network?

Interested not in SoC namely in voltage.

Is it possible to specify the transition to 51-53v? and a gradation of 0.1v?

(Many inverters do not allow you to set the transition to work from the city network when the battery voltage is above 48 or the maximum that I have seen with Voltronic 51v-and a multiple of 1 volt i.e. 51 and then immediately 50)

2) In what range can a floating charge be set? those. maintenance voltage?

1) Please tell me MK3-USB is not included in the package?

If I buy a MultiPlus-II 48/3000/35-32 GX, do I still need to buy the MK3-USB separately, or do I no longer need a USB adapter thanks to the GX?

2) A 24 volt inverter is more expensive than a 48 volt one. Please tell me if there are any advantages in buying 24 volts?

I understand that the current when working at 24 volts is 2 times more and, accordingly, the load on the inverter, but I also want to understand if there are any advantages in the future? Maybe a 24 volt solar controller will cost less or is it easier to implement something on it?

Hi @Vladymyr M.

24V inverter is more expensive because of the higher currents involved. Most people (me included) would go for a 48V system at the power level you are using, I can't think of any obvious reason to prefer 24V

If you cannot achieve exactly what you want with ESS then it is possible to install the Large operating system on a GX inverter and then program Node Red to do the more complicated things you mention.

The MK3-USB is not strictly necessary as you can load all the settings using Remote Access over the internet.

I have done this with Node-Red. Works a treat.