I have a 24/500 and use the remote switch plus Victron Connect app via Bluetooth. I often get a low voltage alarm and the inverter doesn’t start.
Voltage is over 27v. Cables to inverter are 10mm2.
I’ve now set both low battery restart and alarm and charge detect to 20v and it seems fixed. CD was at a default 28v. I’m assuming the inverter won’t start until that voltage is present. If so it seems too high for a default setting??
The point there is to make sure that the battery bank reaches a moderately high SOC before allowing the inverter to start back up; a common 24vNom battery bank will bulk charge to 28.8v before switching to Absorption, so the default setting of 28v as CD in the inverter ensures that the battery has had some time to get charged (but is still not out of bulk) before the inverter, with its own inrush as well as whatever load may be connected, tries to restart.
Setting that too low will result in rapid cycling, where the inverter tries to turn on, the inrush current / loads of the inverter cause vBat to drop, the inverter turns off, vBat recovers, the inverter tries to turn on, the inrush current / loads of the inverter cause vBat to drop, the inverter turns off… and so forth.
Since 20v is a dangerously low voltage for a 24vNom battery bank, I’d personally recommend that the setting be raised again, but that’s between you and your electrician at the end of the day!
Thanks. SOC is in the high 90s of a 1000Ah 24v battery. Stacks of juice for a 500VA inverter.
And despite not being in Eco mode, the unit often switches on - searching?? - when the other supply is available and being used. I installed the 24/500 when my 24v DC fridge packed up and couldn’t economically be repaired. So the 24/500 just runs the fridge - I’ve found it can run other low W devices as well eg ceiling fan.
When I use higher power kit off a Multiplus 24/70/3000 unit, a relay switches off the 24/500 using the remote contacts. I wonder if the H and L terminals and which way the remote is wired has anything to do with the issue I am experiencing?
Seems the 24/500 is trying to be too clever by half.
The inverter has no way to know how big your battery bank is, so the default settings are there to protect the battery; that’s why it’s all adjustable though, so that you can configure for your particular system.
Very possibly - that would be a question for your systems installer.
That’s certainly one way to look at it I suppose.