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Andrew avatar image
Andrew asked

ESS keeps cycling batteries during daytime

Multiplus II 48/3000/35-32

Bluesolar Charger MPPT 150/35 rev2

Vinus GX Controller

150Ah Gel Navada


I am having issues where ESS with Optimised with Batterylife or Without Battery Life. It will discharge the batteries to my SOC of 80%, start charging the batteries to 100% again but in the time that it charges the batteries the MPPT will only charge the Batteries and not feed any excess solar to loads.

Also how do I set ESS up that it will only use Battery power at times of low solar, ie. at night and then only recharge batteries when solar is available again

ESS
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3 Answers
Andrew avatar image
Andrew answered ·

2kWp installed, 2x 4 250Wp Panels

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Rob Fijn avatar image
Rob Fijn answered ·

Hello @Energyvest, by default it should do what you expect from it.. You only set if you Feet-In excess solarpower and you need to set Minimum SOC (Unless Grid Fails).

The question is: You say it discharge the battery during the day. I would assume your load is too big in compare to your harvested solar energy. Your Mulit will use the battery as long as this is above the SOC set point... Your Solar can not keep up, as the mulit 'takes' more..

What do you think?

Regards, Rob


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Andrew avatar image Andrew commented ·

Hi Rob


I would have expected it to use PV and supplement the shortfall then from the Grid.


Also what my problem is that when recharging the batteries from PV after reaching the 80% SOC it does not feed the excess Solar to the loads and drops the the solar only to what the batteries require.

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Rob Fijn avatar image Rob Fijn commented ·

Hello @Energyvest, You say that the MPPT output drops.. This should not be. First of all when you login to the MPPT via VictronConnect (via Bluethooth) you must read ESS at "State". What do you read here? (VictronConnected>STATUS > then look down at Battery when you see Voltage, Current and then "STATE")
This should read ESS, as you must have the ESS assistant in your multi.

You do have the latest firmware in your MPPT, Multi and Venus?

Regards, Rob

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denzel avatar image
denzel answered ·

HI,

I have a very similar setup. I also noticed when using ESS for me it was not efficient, I wanted to use solar first then batteries then grid. ESS never did this on any occasion high or low load demand. I moved to HUB-1 PV. My system now users Solar to keep batteries charged and feed the loads.

In the Event the load demand is greater than the solar it users the Grid.


Regards

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