Recently installed a Multiplus 3000 at a RV of a customer. He had a (small) petrol generator already available. (2800W). However, since this is a rather old unit, it struggles with sudden high loads.
From idle (no load) to a load takes some time to stabilize. The MP however detects it as a instable grid, and shuts down and the process repeats.
(Customer has an auto transfer switch so the AC input of the MP is either grid OR generator)
I have to reduce the DC charger to 20A in order for the MP not to shutdown.
By adding a base load of 300W (Halogen bulb) I was able to get 40A (common trick to stabilize small generators). However, I think it would be able to provide more charging if the charger ramp-up was slower (so the generator has more time to adjust for the load).
On some of our bigger UPSses we have an adjustable ramp-up time: The time which it takes to slowly switchover the load (and not a big drop of the load on the generator).
Is it possible to configure this setting? (Either a configurable timer, of just a toggle box 'enable slow ramp-up' which is like 60sec or so (so smaller generators have sufficient time to stabilize)
Trouble is, the Multi doesn't know of the external ATS. So if it were already running on highish grid power and the genset was switched in then the genset would still gag and likely cause the Multi to reject. Once anyway, when it attempts a reconnection the DCL should bring it back on ok. (Providing the grid hasn't switched back in too at the ATS). 
