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pun avatar image
pun asked

VE Config Assistants programming

MultiPlus-II configuration 48 | 5000 + MPPT charger + PYLONTECH5000 I want to use the grid in case of high demand and bad weather or low SOC to keep the batteries but not fully charged. Virtual switch cannot be used because the inverter does not have SOC data from the BMS. There is a problem with assistants because they overcharge each other. I've also tried NODE-RED, there so far I haven't been able to find how to control ignore AC input 1 My demands should look like this (test example):

do not ignore AC input1 if load is > 1700W or ignore AC input1 if load < 1000W

do not ignore AC input1 if AUX input1 closed or ignore AC input1 if AUX input1 open

charge limit 1A if AUX input1 < 1V

charge limit 50A if AUX input1 > 4V

Cerbo - turns on Charge current control if SOC < 20% set Cerbo relay1 on

if SOC > 25% set Cerbo relay1 off

How to solve it? I don't want to swallow ESS because of overflows.

Multiplus-IIPylontechAssistants
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2 Answers
Jons Collasius avatar image
Jons Collasius answered ·

Wrong way.

Update all devices and configure your MultiPlus 2 according to this manual.
https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

You also should use the ESS Assistant, no other Assistant needed.
"Multiplus 2, Cerbo, MPPT and Plylontech US5000" is exactly my setup and it worked out of the box. Just follow the manual.

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pun avatar image pun commented ·

As I wrote - I can not use ESS, because of there can be small feed back to grid - I am still not connected to grid.

Of cause, ESS everything solves.

Your link does not work

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Alexandra avatar image
Alexandra answered ·

@PUN

What do you mean you are not connected to Grid? What is the inverter connecting to?

The inverter will get SOC from the battery through the cerbo so that is not an issue. Just also program the internal monitor on the inverter.

Or you can use the generator assistant to ignore AC.

https://www.victronenergy.com/live/assistants:ignore_ac_input_using_the_generator_assistant

I also recently experimented with a daylight switch and a contactor for disconnecting mains during the day. And another with a timer (modified from this link). If you do that, then you can use ESS and then the system disconnects when the solar is good and you don't worry about feedback.

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pun avatar image pun commented ·

I am connected to grid, but I can not supply energy back to the grid - it is why I can not use ESS. In case of using BMS connected from battery to Cerbo is impossible use set of assistents for SOC conditioning. It is my main problem. That is why I ask forum. I am able to send my own software part to the Cerbo with Node-red - it can use SOC. But in this case I can not mannage ignore ACinput. This is vicious circle. I have tried many things, many assistents - but there is possible to process only one condition. The main problem is that something is controlled by the Cerbo and the rest by the inverter. Many things are hard-coded and cannot be easily changed.

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