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Self-consumption Hub-2 v3 Assistant – a major update

Important update to this blog post: 15th August 2014

Issues discovered with this release

We have underestimated the differing number of combinations and interactions with the Assistant release for the Self-consumption Hub-2 v3, as originally detailed below. It has been released too soon, which has caused several issues and I wish to personally apologize for that. A number of the problems are already fixed. Further fixes are being implemented and a lot of testing is being done as we speak.

What we will do now

The Assistant has been updated just now (late Friday), and it is now clearly marked as a Beta release. Please use this beta to improve systems that have already been configured with the hub-2 v3 Assistant. I recommend to wait a bit if using it on new installations, as it is quite certain that you will need to update anyhow in the coming weeks.
We will inform you here, just as soon as we can, when all issues are solved.

Problems solved in the updated release today

– VE.Bus BMS problem: balancing started at the wrong conditions
– Sustain mode could (falsely) be triggered when a large load switches off
– VE.Bus State of charge would drop because Sustain mode was falsely triggered
– Absorption was always skipped, except during a maintenance charge of course. Now it is only skipped when connected to the grid, and when feeding back to the grid is allowed. In other words: it will always use the available solar energy for absorption, when in inverter mode.
– In some situations the system would keep inverting, instead of switching to the grid, and the other way around.

Problems which are not yet solved

– If the battery voltage drops below the pre-alarm level, because of a high load in combination with grid assist, the state of charge is falsely set to a minimum, which activates the ‘low SOC recovery’ mechanism: loads will temporarily be powered from the grid, the battery will be charged from PV only, low battery alarm LED is blinking. The low SOC recovery mechanism stops when the state of charge reaches the release condition. The default release percentage varies per battery type, and is between 30 and 60%.

How to install the updated Assistant

Follow these instructions: https://www.victronenergy.com/documentation/assistants:how_to_update_an_assistant

Yours sincerely,

Matthijs Vader


Original post: 29th July 2014

A major overhaul of our self-consumption Hub-2 assistant is now complete. It is available for download using VEConfigure3, as of last night.

For those new to Hub-2 and AC-coupled systems, find more reading material here:

The two wiki pages above are new and still being improved every day. There will be more information about this in a future blog post.

Now, back to the updated Hub-2 assistant. The new welcome screen is shown below. Read it, and the policy selection screen below, carefully to learn about all the options and features.

hub2-v3-welcome

New: policy based selection

After selecting the battery type, the Assistant will ask which policy you prefer:

hub2-v3-policy

With these new policies, the old PV Inverter support assistant has become almost obsolete.

New features and changes

Hardware and firmware requirements

Note: Besides these new developments, much time and energy has also been invested in the texts and explanations in the assistant pages. Covering all the possibilities in easy to read text is not easy! Nonetheless, if you have suggestions for improvements, please let us know via the comments below.

Have a good day! Matthijs.

Avatar of Matthijs Vader
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