Hi,
I am running out of options of things to try so hoping someone here is able to help. I am running a Victron Quattro Multiplus 24/5000 with 24V batteries, and the generator is an Onan Microlite 4000.
When plugging to the wall, the Multiplus charges the batteries without issues. I have a Kilowatt measuring device and when plugged into the wall it shows 60Hz, 118.4V. When running the generator I get roughly 118.2V and 59.7Hz with very minor changes, nothing below 116V or above 62Hz.
Every 2 minutes roughly, the Multiplus will disconnect from the generator and emit a click. It comes back on a little bit later, draws power, and disconnects again. The NS protection log will show “RoCoF too high” or “"Under Voltage”.
I’ve replaced the control board on the Onan, so that’s brand new. The power coming out of it seems clean and will run the motorhome without issues if I bypass the Victron setup.
I am fairly certain I’ve followed all the steps recommended such as connecting to L2, lowering the AC low disconnect, selecting Weak AC input and disabling PowerAssist. Nothing changes.
I really don’t know what else to try. I am attaching here (https://photos.app.goo.gl/6dqyhh9vf7aE2y9j7) every single screenshot of the VEConfig software in the hopes that someone catches something I missed. Please let me know if you would like additional information!
Thank you in advance.
A Multiplus has one ACinput, a Quattro has two. I guess the wall outlet is supplying 118V not 188V
RoCoF means Rate of Change of Frequency, so the AC inputs frequency changed too quickly. That can either be caused by the generator itself, from running rough, or by the load, for example something like an HVAC unit switching on.
PowerAssist should actually help the generator. If the AC input current limit is set to 10A for example, then a load of 12A will be supplied by generator with 10A and by the inverter with 2A. But you might want to try around with the Assist current boost factor. The standard of 2.0 might be too high or low. The boost factor essentially means that in the event of a sudden load change, the inverter will quickly assist with (ACinput current limit x boost factor) so in our example here 20A. Which would be too much for our example load of 12A
Have you tried with the UPS function disabled?
Sorry you are totally right. It’s a Quattro not a multiplus. And yes I meant 118V not 188V, that was a typo. Good catch and thank you. I am going to update my post.
Thanks for explaining the boost factor to me. I turned PowerAssist back on and disabled UPS and the same is happening. It’s worth noting that I am not running any load other than charging the batteries.
I am not seeing the RoCoF error today, only the Under Voltage one, which is weird because I can’t imagine the generator is dropping all the way down to 90V from what I am seeing on the Kilowatt tool.