rosie grid support and ac charging setpoints/priority

[karlsolar]

Hi, I am working on a rosie (neighbors) and we want to be able to run the rosie on grid support (no grid sell) while keeping the AC charger on so we can protect the batteries.  the batteries are SOK server rack LIFEPO4 batteries, so sitting at lower SOC isn't an issue. 

theory of operation of this system:  run all loads on critical loads panel whenever batteries are above about 20% SOC.  when batteries drop below that state, transfer loads to grid until the battery voltage/soc recover to about 50%.  we'd like to keep the AC input breaker on, so we have as much redundancy as possible.

we are using the grid support function based on on battery voltage (51.5 V at this point) and will run it on SOC once the WBJR can calculate SOC accurately (I assume that once it sees the batteries hit full voltages a few times it will start doing so accurately)

I want to keep the AC charger function operational, should we just set it to charge to 51 volts float or something like that?  we had it set to 56 v and left the breaker off.  we want the additional backup of having the charger functional.  the Classic 200 is set to charge to the proper battery float voltage of 56.7V

also, this won't grid sell without some additional setting changes right? 

also i don't know what to do with the AC input control screen and Load Xfer.  I can't find anything about that in the manual.

[rs50pilot]

I do not think there is a way to do what you want.  Rosie only seems to charge once a day and that seems to be midnite.  You cannot have her set to charge any other way that I have found.

I use mine as backup power and to load shift during ON PEAK times. I want Rosie to run during my set times and then when out of those time ranges to automatically recharge my bank if grid is present, instantly.

Say the grid goes down in the middle of the day for 8 hours. Batteries drain to 50% in that time.  Grid comes back up and you want to charge as much as you can before it goes down again. Well it doesn't work that way.  She will only charge once a day and sometimes not, for some reason.

She is not setup to sell back.  At least not that I've seen yet.

Load Xfer I can't remember exactly what this does.  Mine is disabled.  I believe it transfer X amount of power from battery to support the grid....  but don't quote me.

Time Xfer will allows you set set a period of time that Rosie will not use the grid power.  It turns off the AC in from grid and runs off of battery until the timer is up.

I use this for load shifting during ON PEAK times. However it seems that if you have Rosie set to Time Xfer from 5pm to 7am Rosie doesn't always want to charge the pack that day.  Some weird charging strategy in her brain.

[karlsolar]

huh.  well that's frustrating.  I'd hope there would be more options as to when to charge/not charge. 

[FNG]

Hi, I am working on a rosie (neighbors) and we want to be able to run the rosie on grid support (no grid sell) while keeping the AC charger on so we can protect the batteries.  the batteries are SOK server rack LIFEPO4 batteries, so sitting at lower SOC isn't an issue. 

theory of operation of this system:  run all loads on critical loads panel whenever batteries are above about 20% SOC.  when batteries drop below that state, transfer loads to grid until the battery voltage/soc recover to about 50%.  we'd like to keep the AC input breaker on, so we have as much redundancy as possible.

we are using the grid support function based on on battery voltage (51.5 V at this point) and will run it on SOC once the WBJR can calculate SOC accurately (I assume that once it sees the batteries hit full voltages a few times it will start doing so accurately)

I want to keep the AC charger function operational, should we just set it to charge to 51 volts float or something like that?  we had it set to 56 v and left the breaker off.  we want the additional backup of having the charger functional.  the Classic 200 is set to charge to the proper battery float voltage of 56.7V

also, this won't grid sell without some additional setting changes right? 

also i don't know what to do with the AC input control screen and Load Xfer.  I can't find anything about that in the manual.

What you are talking about is exactly what I do here. Here is what I would set and how
Grid support set to say 51.6V
Rebulk set to say 48.5 (May take some playing)
Charger on
Float time set to 15 minutes

Now what happens is the Rosie will run the loads and ignore the grid anytime the battery is above 51.6, If the weather turns to crap and the battery sages lower it hits rebulk at 48.5 and initiates a charge. After 15 minutes in float the charger goes silent and grid support kicks in again