Recently I purchased a small Honda generator with Bluetooth (this allows one to monitor output) to support use of an air conditioner. The generator feeds into the multiplus which then feeds the circuit panel with one breaker dedicated to the air conditioner. The generator is rated to a steady state value of 15A*.
When the batteries are at 100% this works as expected and the generator consistently produces ~1600 VA. This appears to be close to what the air conditioner needs with both the fan and compressor on.
However, when the batteries are as some lower level, say 50%, this doesn't happen in steady state! Initially, yes, the generator produces ~1600 VA. but that doesn't not last too long. In one case it maintained ~1600VA for an initial 10 min or so but then it suddenly reduced to some lower level (~1400 VA) even though the air conditioner was running fully! With insufficient generator output the Multi pulled from the battery to meet the air conditioner demand which I learned after the fact. A very undesirable situation, particularly when the battery is already at a low SOC!!!
In the case where I caught this happening I used the Digital Multi Control Panel to turn the multi to "charge only" for a few seconds and then back to fully on. I found doing so caused the situation to somehow reset and the generator went back to producing ~1600VA temporarily.
Obviously, what is desired (and what the manual suggests) is that the multi itself keeps the generator at maximum output and any extra energy above the current usage is used to recharge the batteries (i.e. when the compressor cycles off).
What is going on here? How do I prevent this behavior going forward? I'd like to be able to trust that the generator is utilized to it's maximum and no power is unnecessarily taken from the battery.
* Note: I am using a Digital Multi Control Panel which is set to a current limit of 16A. After some experimenting I found this value prevents the generator from overloading and shutting off.
** To get around this issue I did consider using the Multi Auxiliary AC output. However, I hesitate to wire this directly to the air conditioner as that would bypass the distribution panel and the 20A breaker protecting the wire to the AC. I don't have space for another box to house a separate breaker.