Kia ora all, I have an off grid EasySolar II GX set up with AGM batteries and a PV inverter on ACout 1 of the EasySolar. The EasySolar has about 3 kW of panels facing morning sun and the PV Inverter has 3 kW facing the afternoon sun.
The EasySolar uses Frequency Shift Power Control to choke off the PV Inverter when the batteries are full.
This works rather well in that it provides a long period during the day with enough production to charge my EV (10 A, 230 V).
What could be better is that the EasySolar seems to favour powering the AC circuit by inverting from the battery, generating heat in itself while choking back the more efficient PV inverter.
Is there a way I can tell the EasySolar to prefer using the PV Inverter to power AC circuits?
Thanks
Graham
The trouble is the system also has to protect the batteries, so it is safer to have the PV inverter ramp down.
You can do a more clever control using node red so it runs more, but we had to add an energy meter to make that happen more smoothly.
Thanks Alexandra.
We have a BMV700 monitoring the battery. Does that qualify as an energy meter?
No, mine also has a BMV but we needed something for the bigger loads specifically.
So you need an AC meter for this idea. We are currently using a shelley to monitor the loads then a calculation done in node red with modbus control to ramp up or down. (Frequency shifting still works).
That’s great, I love Shellies, all my lighting and a few power outlets are Shelly-controlled. Are you able to share your code to do that please?
No, it is an SMA SunnyBoy HF3000- quite an old model. It has RS485 ports and it can be controlled over them by YASDI, but I haven’t probed far into that.