Hi everyone! I'm having a hassle with my Sumry 6kW RS series inverter. I set the minimum battery voltage to 49V so it should use grid power instead of draining from my batteries. However, I've noticed it's still pulling about 30W from the batteries, which I'm assuming is due to some internal consumption of the inverter. This issue becomes particularly problematic in winter when there's little sunlight, causing my battery voltage to drop to 46V after a week, ultimately leading to the BMS shutting down. Is there any way to prevent the inverter from using any battery power while in bypass mode?
3 Answers
What you're experiencing is often referred to as "parasitic consumption." Unfortunately, unless you turn off the inverter completely when you don't need it, there isn’t a lot you can do to stop this drain. It's just how these devices operate.
Yeah, pretty much. The inverter needs some power to run itself, and there's not much that can be done about it. You might want to consider adding more solar panels or another battery if that's an option for you.
If it's any comfort, you're not alone in this! It's frustrating when the manufacturer doesn't respond either. You could think about setting your minimum voltage higher, but that will require manual adjustments. I totally get wanting a hands-off system! It'd be great if there were alerts for when solar input drops or if fuses blow - I wish my setup had that too!