Conext XW+ charging issue

ZimInSeattle

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Joined
Aug 26, 2019
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38
clyleadams said:
ZimInSeattle said:
clyleadams said:
ZIM, Have you solved this problem yet? I have a 6848pro AC coupled with a solar edge inverter. I sure would like it to charge the batteries when the AC OUTPUT side is positive (greater than the load). I've changed every setting that can be changed and it just hangs out at .5V over recharge volts. I have tripped the AC1 breaker but the solar edge inverter outputs too much much power for the Conext which goes into curtail mode which shuts the Solar Edge shuts off with a high freq fault. Also, the power seems to get abnormally flaky with flickering lights and lots of chattering in the Conext. It sure seems like the Conext should be able to automatically charge the batteries to the bulk voltage setting when there is excess power on AC OUT.
No, clyleadams, I have not resolved the issue. I still need to wire in the Batrium. In my situation with net metering, grid acts as battery so all excess PV goes to grid. Doesnt matter where the AC for charging battery comes from. Ive just been manually bulk charging every few days. Im pretty sure Batrium will be easy to integrate as theyve already done the code for CAN bus from Watchmon to the Conext Bridge. Conext Bridge has been superseded by Conext Gateway which also has CAN bus interface. Are you grid tied & do you have net metering? So you have 8KW AC coupled into critical load panel? My understanding is you shouldnt have more than the 6.8KW output rating of the XW Pro coupled into the load panel. I have 2KW into load panel & 8KW into main panel. It doesnt really matter where the AC is coupled though except in the case of grid outage which never happens here.
Today my system started charging all on its own! I turned off all of the advanced features on the conext except grid support, put a charge block on until 8:30AM, and I set grid support volts and recharge volts at the same value.... 47.50 volts. apparently, we had a nice 120A battery draw at the perfect time and it lowered the battery volts below recharge volts long enough for a charge cycle to begin. If this works consistently, I will be completely satisfied with it operating in this manner. I will be able to use the battery at night and get a charge started after the battery is depleted in the AM.
Yup. Mines done that once or twice. It seems theres always a 50 or 60 watt draw from battery to XW when in AC Pass Through. Think mine takes about 8 hours to burn that last half volt and begin charging. I have my grid support & recharge voltageset same as yours. I like to dochargingduring the day as I want inverted power available at night & morning when its dark.
 

ZimInSeattle

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Joined
Aug 26, 2019
Messages
38
Noted this morning XW+ was in the AC Pass Through 1/2 volt void above Recharge Voltage and only drawing about 15 watts. It went into AC Pass Through at 10pm last night at 47 volts and at 6:30am it was at 46.89 volts. Still 0.39 volts above 46.5v recharge setting. So all things being equal, I figure it would take about another 30 hours before recharge would occur on its own. Why oh why Schneider doesnt have a setting to eliminate the half volt offset is beyond me. It would only make sense since in my case, and Im sure in many others that are AC coupled, were only charging from what the XW would see as grid power.
 

400bird

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Apr 27, 2020
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88
noworries2095 said:
Did it help? I'm having the same problem in 2020

I'm guessing no, not yet.

But you asked the same day while the thread was still active, no need to include the year you're having the issue.
 

ZimInSeattle

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Joined
Aug 26, 2019
Messages
38
So after about 4 months of having to invoke Bulk charging manually on my XW+, a couple weeks ago it started charging on it's own as it discharged down to 47 volts. I have recharge set at 46.5V & Grid Support set to 47V. Don't know why, but I'll take it. It's as if it 'learned' when to recharge. :D
 

400bird

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Apr 27, 2020
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88
Wait, really?!

Was there a software update or anything?
That's good news. Glad it is working for you.
 

not2bme

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Oct 16, 2017
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485
I have been spending time testing with my XW (but not in ac coupled mode though) and I'm starting to understand it. Have you considered talking to it via modbus to make that change? I know it's a little of a headache, but it's a possible solution. I just started to communicate with it on the raspberry pi last night, don't quite understand how modbus works yet but I've managed to get it to give me some parameters. Should be able to start sending to it by the end of the week.

On the menus, it takes a lot of reading just to make sense. Then it's trial and error. I almost burnt my shed down because I forgot to go into standby mode (the configuration doesn't get saved otherwise). Somehow they thought the max value of the parameters should be the default. I turned it off and back on again and suddenly I hear a big hum and I looked at the screen and it told me it was charging my batteries at 6000W. Stupid thing had it defaulted to 140A and I was only using a 12ga wire to test. Luckily all these happened in seconds and I flipped the breaker.
 
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