Battery Only being used sometimes in grid connected system  

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(@tdastalfo)
New HOMER

I've created a system that uses PV, wind, SonnenBatterie 16 kW Li-ion batteries, a converted, and is grid tied. I would to create a system where as much renewable energy or battery storage is being used to meet the load as possible, before energy is sold to the grid. To restate, I'd only rather the system sell energy to the grid when the storage is full and the load is being entirely met. And likewise, I only want the system to buy energy from the grid when the batteries are empty and renewables aren't producing enough to meet the load. The problem I am having is overnight sometimes when renewable generation is lower than the load, the model will buy energy from the grid rather than using the nearly full batteries to meet the load. Does anyone know how to make the batteries discharge fully before electricity is purchased from the grid? I am using the load following control strategy, because generation order is not an option with a grid connection system. Also, I don't know where to start writing a matlab script to get better control over the system. Any suggestions would be most appreciated.

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Posted : November 30, 2017 7:38 pm
(@dhiwaakar)
Illustrious HOMER Admin

Hi Tom,

 

Under demand rates, try selecting discharge battery as much as possible option and see if it helps.

 

Best,

Dhiwaakar Purusothaman

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Posted : December 15, 2017 11:00 am
(@dawsonpatrick)
New HOMER

Hi, where is this capability? I am not seeing it under demand rates?

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Posted : January 22, 2019 8:53 am
(@dhiwaakar)
Illustrious HOMER Admin

Hello Dawson,

 

If you click on the Edit button on a demand rate in HOMER Pro, you can see the option to check 'Override dispatch strategy'.

 

Best,

Dhiwaakar Purusothaman

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Posted : March 26, 2019 11:42 am
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