Lux ac battery controller

cm4ever

Thanks for the suggestions.

I've done a little bit of digging and it looks like the batteries may have already have been registered/part configured, but not fully configured for my wifi network as there's no extra wifi clients showing up in my access point logs i.e. the four batteries.

Just currently waiting for a technical response to my queries from the installation company as I'd like to ensure they're aware of the comms issues I think I currently have with the batteries - I know that the batteries don't require the wifi to work etc, but if the functionality is there, don't see why it shouldn't of been fully configured in the 1st place....

devondumpling1961

I have an issue with battery capacity.

I have 10 x uHome 2.4kWh LFP2400.  Every night they get charged up to 99% from 10%, taking a suitable amount of power to do so (around 22kWh).

Yet every day I only get 15kWh out of them before they're down to 10% SOC.  That's a discharge efficiency of 72% when it should be nearer 99%.

Does anyone else have this problem, and if so, do you know what's happening?

They're in two stacks of 5 batteries each connected to 2 lux "squirrel" inverters.

Alnat1

Are they in a cold place? Loft/garage temperatures have been very low recently and we have noticed our Pylontech batteries are affected by this.

devondumpling1961

Alnat1 said:

Are they in a cold place? Loft/garage temperatures have been very low recently and we have noticed our Pylontech batteries are affected by this.

No.  Also, this happens irrespective of the outside temperature.

Solarchaser

How are you monitoring charge vs discharge?
I ask because it used to be on the app, but there is only charge now.

I think I previously worked out my round trip with pylons at 82% using charge vs discharge figures

cm4ever

devondumpling1961 said:

I have an issue with battery capacity.

I have 10 x uHome 2.4kWh LFP2400.  Every night they get charged up to 99% from 10%, taking a suitable amount of power to do so (around 22kWh).

Yet every day I only get 15kWh out of them before they're down to 10% SOC.  That's a discharge efficiency of 72% when it should be nearer 99%.

Does anyone else have this problem, and if so, do you know what's happening?

They're in two stacks of 5 batteries each connected to 2 lux "squirrel" inverters.

Hi, from my limited experience with a stack of 4x uHome-LFP 2400, connected to a Lux-3.6K hybrid, at times I don't think the reported SOC levels are particulary accurate.

I've seen sudden drops from a reported 26% SOC to 10% under periods of prolonged low load i.e. between 200-350w with no spikes in demand..... I've also seen the battery protection system kick in and start a 300w trickle change with a reported SOC of 21%.

At the moment, this system seems to be a lot of smoke and mirrors, looking forward to longer days of sunshine to get an understanding of what the system is really capable of.

1961Nick

Solarchaser said:

How are you monitoring charge vs discharge?
I ask because it used to be on the app, but there is only charge now.

I think I previously worked out my round trip with pylons at 82% using charge vs discharge figures

The metered efficiency of my pylons on the AC>DC>AC round trip is 79.9% so that's the same ball park as your system. The Solarman app understates the charge by 4.3% & overstates the discharge by 6.6%.

A 22kWh charge would therefore be expected to yield around 17.5kWh.

Solarchaser

This is you using your smart meter Nick or something else?

I think your figure will be closer to reality for me also, as I've noticed recently the lux software lies in relation to how much it takes in and puts out.
For instance last night on charge it was saying in the app both were charging at 3400w and earlier in the day outputting at 3300w.
However with the myenergi app updating every 10 seconds it's much easier to sync up with my in house display for smart meter, and because the batteries are on a separate ct clamp on myenergi it reportes that charge was happening at 7200, so 3600 each, and discharge was at 6200 so only 3100 each.

Could this be temperature as they are in a cold loft? Maybe, but either way, I'm not happy with the inaccuracy. 

Could it be the myenergi ct clamp is inaccurate,  maybe, but its total values were tying up with the smart meter values on ihd.
You could argue that it was fudging figures based on a calculation, yeah maybe that is true, not sure, butbit certainly raised questions for me.

EVandPV

I find the myenergi ct readings the most inaccurate. 
I also have an optismart sensor on the pv meter which reads the blinking led but the Lux seems to be the most accurate of the lot.

Our Octopus account shows consumption of 10.94kwh yesterday, the Lux shows 10.7kwh and myenergi shows 11.9kwh.

1961Nick

EVandPV said:

I find the myenergi ct readings the most inaccurate. 
I also have an optismart sensor on the pv meter which reads the blinking led but the Lux seems to be the most accurate of the lot.

Our Octopus account shows consumption of 10.94kwh yesterday, the Lux shows 10.7kwh and myenergi shows 11.9kwh.

Likewise - I have LED sensors (Geo) on both the generation & import meters & the MyEnergy app is consistent with those readings. Very impressive for a CT clamp.