In case it helps anyone with a 115VAC wired boat
, I'll follow up with my experience. All said, my 8KW Fischer Panda
generator outputting 115V didn't skip a beat with the inrush current powering a 115V 2HP Bauer Junior II portable compressor. It's advisable to open condensate drains on manual drain systems like mine to ensure the motor starts without load.
I initially bought the Hyper Eng Sure Start to reduce inrush, given the great recommendation here and the US distributor support convincing me the HP rating had some "fudge" and would work
...but it would not start the motor due to its start capacitor being unable to handle the high inertia required. The Aussie engineering group later confirmed this for me. This is the 115V single phase version I'm referencing (there is a 230V 1-phase unit that can handle higher HP). Incidentally, I've decided to reuse it for one of my air conditioning units and see if the inrush is low enough to run aircon off the inverter
. Speaking of the inverter, the manufacturer tech support (Mastervolt) highly recommended against trying to power share the dive compressor load with generator and inverter, even in the case of paralleling two inverters. I decided to heed that advice
for the dive compressor and not wire it through the inverter. Ultimately, my original grand plan of reducing startup loads and power sharing resulted in simple wiring
to the AC panel with no soft start or VFD. I'm definitely guilty of overthinking things at times.
FWIW- in my research
I found a single phase 120V input, 1ph/3ph 220V output VFD by a company called ATO. General wisdom would be to opt for a 3-phase motor compressor going this route
as also recommended here, but it would be an option either way with a 1ph or 3ph motor. Model# GK3000-SP1S1-004 (5HP). It's not a recommended practice to take single phase VFD output, but their engineering support advised it would work
well to effectively eliminate inrush at either 1-phase or 3-phase output. No firsthand experience with the product, just passing info along. I could be wrong, but I didn't see any 120VAC input drive options rated at 2HP+ from the reputable players like Eaton, Schneider Electric
, Fuji, etc or products from Grainger and McMaster Carr. 220V boats have a lot more options.