Tnaik

Yes it made thing how many ppl that dont know to tinker in settings are still using utility power when they shouldnt.

The thing is when i switch to SBU it takes zero power from batteries or utility if there is enough solar power, only in SUB it still draw around 1kw from utility regardless. But like i said above, setting timers for each is a good workaround, but wouldve been better if SUB just worked like it should.

Indeed, i have my batteries saved for power outage during the night time. What I did to solve my issue is to just set a timer on my inverter to have SBU on the whole daytime and SUB on at night, glad i had this setting available, the only thing is i have to change it in the summer time since day time will become longer. Now if SUB functions as advertised it wouldve been better but thats still a pretty good solution.

My whole system is two weeks old, i m using 8 250ah 12v batteries, acid batteries if i m not mistaken

Thats the issue i m talking about, i dont want utility to provide power when solar is delivering enough, thats how the system is acting and i m trying to find a solution for that...

And here are some pics while in SBU. In first picture u can see how even in SBU it was using utility still without even using the batteries, usually when I switch from SUB to SBU i can hear a clique, i didnt this time and couple other time and i can clearly see third priority arrow is displayed on utility now, i think though that is happening when i have a big load, once its lowered it function properly but it needs more testing. Thank you

I did some quick testing while we had like 30min of good weather, I took some pictures of the inverter screen along the way. When i m using SUB and even when there is enough power from solar i m always drawing around 1100-1200w from utility ( the overall power draw was around 5000w) So majority is from Solar i just dont know why i keep drawing 1100-1200w from utility, keep in mind utlity isnt charging batteries. When i switch to SBU, utility power draw drops to 0 and full power is drawn from Solar, although i noticed sometimes when i m drawing alot of power, it takes some time to completely switch from SUB to SBU, it does switch but it keep using utilty even as third priority arrow is shown whilr bypassing batteries. I ll show some pics so u can see better what i m talking about. PS: i saw couple of quick times where voltage on PV1 and PV2 dropped below 100v. here are some pics in SUB.

I ll get one tomorrow to measure it myself and see what kind of power i m drawing fron utility and will let u know. Thank a lot for the much appreciated help.

I m going to get an electrician to measure the utility power since it doesnt show on the main screen, it only shows voltage ( around 230v ) and 50 hz. Yes mine is the new model with RGB LED ring around the touch screen. I ll attach a picture of the one i have. If its drawing insignificant amount than thats no problem at all, i m just worried that it might be drawing a lot more and it ll increase my electricity bill for no reason. As for the PV voltage, i dont recall ever seeing fluctuating massively wether there is utility or not, i have PV1 and PV2, each read on the screen between 220v and 280v when there is a pretty good amount of power (3000+w from each PV) and cold weather. one thing i can confirm is when i use for example 5000w load from my home in a good weather, i can see more then 5000w split between PV1 and PV2 on the inverter screen while still having enough to charge the batteries but utilty still show the 2nd priority arrow indicating its providing power, it might be like u said few hundred watts and thats totally fine, thats what confusing me at the moment.

Thank you for the reply. I m thinking of getting an electrician just to measure how much power the utility is drawing when there is enough solar power. My inverter the the max II so it should be the latest version, not familiar much where i can find the latest firmware for my model. But like u said, setting It to SBU and setting back to utility a little high would probably solve the whole thing, its just would be preferable with SUB if it works as it should. I ll take couple of pics of the inverter screen once we have a sunny day just so i can show how SUB is functioning on mine. Thank you.

What i really want is for SUB to work correctly, Solar to be 1st priority and utility to be 2nd priority to be used ONLY when there isnt enough solar. My whole issue is even when there is enough solar power to power the whole house and charge the batteries, the utility is still providing power to the house at the same time as the solar, SUB should achieve this on paper but its not. As for setting 16, its not a big issue for me but i have it set up as SNU, yet only Solar charges the battery. I have to set power output priority to USB for both to charge battery at same time. English isnt my main language so hope i m getting my message through clearly. Thank you

I have it set to solar+utility but utility never charges batteries unless there is zero power from solar, if i use USB than utility charges batteries at the same time as solar, why not with SUB though? The whole SUB mode isnt working as i was thinking it should work.

Thank you for the reply. In my country we have around 8-9 hours power outage a day although not straight, so i m trying to keep the batteries ready for that time. Ive been noticing that a lot of inverters struggle with correct SUB implementation, i ll try ur suggestion but probably set the back to ac a little higher to keep more juice in the batteries when power outage happens. But ideally if SUB just works it would be the best solution.

Hi all, I m new member here and just installed a solar system in my house, everything is functioning correctly except "SUB" where it draws electricity from utility at the same time as my panels even though i have enough power on panels to power the whole house and then some. My system is : Voltronic max 2 8kw inverter, 15 590w panels in 2 strings ( 7 + 8 ) , 8 250Ah 12v batteries ( 2 x 4 ) . If I use SBU it works correctly and only draw power from the battery when its cloudy and there i not enough power form solar, also in SUB the utility doesnt charge batteries unless there is zero solar power and i have solar and utility set to recharge batteries at the same time. I m not sure if thats how SUB should work or there are some settings i m not aware off. Ive been reading a lot and learning about all this, the only solution i found is to use SBU and put a timer on it where it switched to SUB when its night time, my goal is to not use utility power at all when i have enough from solar to power the house and charge the batteries, only use it in the night time or extreemly cloudy days. Thank you