Uhome battery soc

propnut

My biggest regret was not doing more research before buying into the Uhome ACS 3600 combination. There are two long threads here pertaining to the ACS3600 sucking power from the batteries. I shut my system down each night to prevent this. What is the point of buying a solar system to give you free energy for the thing that is meant to be part of this saving to flatten that power and then suck in power from the grid to charge the battery ????????????

Mine used to cut off at 10% however in Jan I asked Infinity to "upgrade" the firmware. Since then it has been cutting off at 15%, still draining power overnight, but stopping discharging to the home. On Tuesday I reached out to Lux to ask why the change from 10-15%. They came back and said it wasn't them that it was the BMS on the battery that decides. HOWEVER, bizarrely that same night the battery, like yours it flattened right down to 9% and alarms triggered big time on the uHome battery app for low SOC. I can only guess that some change was made remotely. Last night it delivered 3.2KW right down to 50.5V and then immediately started pulling power from the grid. I mean !!!!!!, this is just a whole lot of feces. Previously it used to throttle back the current delivery as it reached cut off. Now bang, down like a rock and then immediate grid charge ?????????



and here's the night before (or that morning depending on how you look at it), the Inverter doesn't seem to know how to calculate the SoC % or perhaps interpret what the BMS is telling it. Either way once again you can see it sucking in power.

Bobjl

propnut said:

My biggest regret was not doing more research before buying into the Uhome ACS 3600 combination. There are two long threads here pertaining to the ACS3600 sucking power from the batteries. I shut my system down each night to prevent this. What is the point of buying a solar system to give you free energy for the thing that is meant to be part of this saving to flatten that power and then suck in power from the grid to charge the battery ????????????

Mine used to cut off at 10% however in Jan I asked Infinity to "upgrade" the firmware. Since then it has been cutting off at 15%, still draining power overnight, but stopping discharging to the home. On Tuesday I reached out to Lux to ask why the change from 10-15%. They came back and said it wasn't them that it was the BMS on the battery that decides. HOWEVER, bizarrely that same night the battery, like yours it flattened right down to 9% and alarms triggered big time on the uHome battery app for low SOC. I can only guess that some change was made remotely. Last night it delivered 3.2KW right down to 50.5V and then immediately started pulling power from the grid. I mean !!!!!!, this is just a whole lot of feces. Previously it used to throttle back the current delivery as it reached cut off. Now bang, down like a rock and then immediate grid charge ?????????

propnut said:

My biggest regret was not doing more research before buying into the Uhome ACS 3600 combination. There are two long threads here pertaining to the ACS3600 sucking power from the batteries. I shut my system down each night to prevent this. What is the point of buying a solar system to give you free energy for the thing that is meant to be part of this saving to flatten that power and then suck in power from the grid to charge the battery ????????????

Mine used to cut off at 10% however in Jan I asked Infinity to "upgrade" the firmware. Since then it has been cutting off at 15%, still draining power overnight, but stopping discharging to the home. On Tuesday I reached out to Lux to ask why the change from 10-15%. They came back and said it wasn't them that it was the BMS on the battery that decides. HOWEVER, bizarrely that same night the battery, like yours it flattened right down to 9% and alarms triggered big time on the uHome battery app for low SOC. I can only guess that some change was made remotely. Last night it delivered 3.2KW right down to 50.5V and then immediately started pulling power from the grid. I mean !!!!!!, this is just a whole lot of feces. Previously it used to throttle back the current delivery as it reached cut off. Now bang, down like a rock and then immediate grid charge ?????????

It's amazing, no matter how much research you do, you only seem to find the negative after you make the decision. my installer has asked ( I  Presume infinity)  to upgrade the firmware, they have also tweaked something . It is really dull here so the pv is only trickling a few watts. my battery has been stuck on 7% all day and is charging at 57W. whether that is coming from the grid or pv is anyone's guess. I am really disappointed, we were really exited about getting solar power, but now I feel like it has been a waste of money.

propnut

Bobjl said:

It's amazing, no matter how much research you do, you only seem to find the negative after you make the decision. my installer has asked ( I  Presume infinity)  to upgrade the firmware, they have also tweaked something . It is really dull here so the pv is only trickling a few watts. my battery has been stuck on 7% all day and is charging at 57W. whether that is coming from the grid or pv is anyone's guess. I am really disappointed, we were really exited about getting solar power, but now I feel like it has been a waste of money.

You can tell where the power is coming from my looking at the portal. Just follow the arrows.

Bobjl

propnut said:

Bobjl said:

It's amazing, no matter how much research you do, you only seem to find the negative after you make the decision. my installer has asked ( I  Presume infinity)  to upgrade the firmware, they have also tweaked something . It is really dull here so the pv is only trickling a few watts. my battery has been stuck on 7% all day and is charging at 57W. whether that is coming from the grid or pv is anyone's guess. I am really disappointed, we were really exited about getting solar power, but now I feel like it has been a waste of money.

You can tell where the power is coming from my looking at the portal. Just follow the arrows.

Yes but this is the situation at the moment .

propnut

Bobjl said:

It's doing what I outlined above. Pulling in grid power to charge the battery because it thinks the battery is in distress. House is consuming 234w, subtract the 197 from the grid should leave you 37W to be pulled in from the grid however you are pulling in 113w. So 76W is going to the battery BUT the inverter has internal losses which LUX claim to be  around 5% so 57/76 x 100 = 25% loss, however we must also factor in the losses of the PV to AC conversion which are probably half of that so you are losing about 12.5% in either direction. Whenever converting from AC to DC or vice versa there will always be losses irrespective of who the manufacturer is. By the way it won't be as liner as I have outlined as some of the power from the grid is going to the house and some from the PV's is going to the battery. It was just to illustrate what is going on.

Bobjl

So this is the situation now. The battery doesn't slowly discharge from 10% over 5 or 6 hours, dropping a % at a time until it reaches 1%, before it starts charging from the grid. Now if the battery drops to 10% if will stay that way for a few hours, but not contributing to the household consumption as it shouldn't. it then may drop another % . but then within five minuets drop to 1% and start charging from the grid straight away . 
I have a feeling that this is probably how it is meant to perform. maybe the battery has to be at 1% before the BMS tells it to start charging from the grid, and the only way it can do this is dump power.
I was in a dialogue with infinity innovations, but they seem to have lost interest. my installer is coming around tomorrow to check that the batteries are online. so I can show him the data and see what he thinks. 

     

Reed_Richards

Bobjl said:

... it then may drop another % . but then within five minuets drop to 1% and start charging from the grid straight away . 
I have a feeling that this is probably how it is meant to perform. maybe the battery has to be at 1% before the BMS tells it to start charging from the grid, and the only way it can do this is dump power.
     

It doesn't sound at all right to me.  My battery discharges down to whatever minimum SOC I set in software, which is 10% in spring, summer and autumn (as per the installed value).  It then slowly loses a bit more charge, it got down to 9% this morning.  Should it ever get down to 5% it will recharge itself from the grid.  My battery never "dumps power", which would be a stupid and wasteful thing to do.  You have a fault. 

propnut

There could be an issue with the BMS on your primary battery. Try changing to one of the others. You need to change the dial and the switch setting and move the canbus cable but you can leave the power cables alone. e.g.

If you have 3 batteries the master dial will be set to 3 the next battery to 1 and the last one on 2. Also the dip switches on SW2 on the master will be 1 on, 2 off, 3 on and the rest off. The second battery they will be all off and the third will have 1 on. So to make the 2nd battery the master, power everything off then.

Change the dial on what was the master to be 1 and what will not be the master to 3, then set all the dip switches on SW2 on the former master to off and on the new master set 1=on 2= off 3=on and the rest off. Move the inverter cable to the new master and power everything back on.

Bobjl

propnut said:

There could be an issue with the BMS on your primary battery. Try changing to one of the others. You need to change the dial and the switch setting and move the canbus cable but you can leave the power cables alone. e.g.

If you have 3 batteries the master dial will be set to 3 the next battery to 1 and the last one on 2. Also the dip switches on SW2 on the master will be 1 on, 2 off, 3 on and the rest off. The second battery they will be all off and the third will have 1 on. So to make the 2nd battery the master, power everything off then.

Change the dial on what was the master to be 1 and what will not be the master to 3, then set all the dip switches on SW2 on the former master to off and on the new master set 1=on 2= off 3=on and the rest off. Move the inverter cable to the new master and power everything back on.

I wont be doing any of that. The system is less then two weeks old. Its the installers and infinity innovations job to put it right.

propnut

Bobjl said:

I wont be doing any of that. The system is less then two weeks old. Its the installers and infinity innovations job to put it right.

   don't blame you, sorry I thought it was older than that.