ScottishBadger
New Member
- Joined
- Nov 19, 2022
- Messages
- 30
Hi folks.
My UK domestic single-phase system is fairly complex (to me!) and I am working through various issues with it, one problem at a time. I've attached a schematic which may help...
Basically, the two solar inverters and the Puredrive 10kWh storage system work perfectly, all my problems revolve around the Solis RAI charger unit.
When the Solis RAI system is in-use, it is programmed to charge from the grid using cheap-rate power at a certain time (00:30 to 04:30), the Puredrive is set up exactly the same and both systems do indeed charge from the grid at the set times. The problem is that the Solis does not fully charge its battery due to low temperature, so for some reason the Solis continues to charge outwith the scheduled charging time even though there is no solar production for it to sense and no load placed on the grid supply as the Puredrive is now supplying the house. As a result, it draws power from the Puredrive, which I do not want it to do.
I think this is happening because the ACREL meter is much quicker reacting to minute changes in power flow to and from the grid (we're talking around 50W) than the Puredrive's CT clamp sensing, and as a result the Solis is seeing power going out to the grid and starting charging before the Puredrive is actually adjusting its output in response to its own Grid CT clamp. The Puredrive now picks up on the demand from the Solis and increases its own output to meet demand, resulting in the Solis using power from the Puredrive to complete the charging of the second storage battery.
I am sure I can "fix" this by offsetting the "grid set-point" of the Solis, but I can't find a way to do it - either in the badly translated ACREL paperwork or the Solis manual. (I can do it easily with the Puredrive, but I want to leave it set at 0W set-point as the primary power source and only have the Solis kick-in when demand reaches say 75W from the grid). Can anyone help with how I can adjust either the ACREL meter or the SOLIS RAI to give me this 75W offset, please?
My UK domestic single-phase system is fairly complex (to me!) and I am working through various issues with it, one problem at a time. I've attached a schematic which may help...
Basically, the two solar inverters and the Puredrive 10kWh storage system work perfectly, all my problems revolve around the Solis RAI charger unit.
When the Solis RAI system is in-use, it is programmed to charge from the grid using cheap-rate power at a certain time (00:30 to 04:30), the Puredrive is set up exactly the same and both systems do indeed charge from the grid at the set times. The problem is that the Solis does not fully charge its battery due to low temperature, so for some reason the Solis continues to charge outwith the scheduled charging time even though there is no solar production for it to sense and no load placed on the grid supply as the Puredrive is now supplying the house. As a result, it draws power from the Puredrive, which I do not want it to do.
I think this is happening because the ACREL meter is much quicker reacting to minute changes in power flow to and from the grid (we're talking around 50W) than the Puredrive's CT clamp sensing, and as a result the Solis is seeing power going out to the grid and starting charging before the Puredrive is actually adjusting its output in response to its own Grid CT clamp. The Puredrive now picks up on the demand from the Solis and increases its own output to meet demand, resulting in the Solis using power from the Puredrive to complete the charging of the second storage battery.
I am sure I can "fix" this by offsetting the "grid set-point" of the Solis, but I can't find a way to do it - either in the badly translated ACREL paperwork or the Solis manual. (I can do it easily with the Puredrive, but I want to leave it set at 0W set-point as the primary power source and only have the Solis kick-in when demand reaches say 75W from the grid). Can anyone help with how I can adjust either the ACREL meter or the SOLIS RAI to give me this 75W offset, please?