OK, I was PMed the link and will post it here:
Franks Voltage Booster, my 2-cents worth - iRV2 Forums
There is a BIG warning sticker on his units not to use them with the AC AND the water heater.
My camper has an ammeter I installed (you can see the install in my review link) that shows the current draw incoming to the camper - before the Franks so I can monitor it to avoid exceeding the FRANKS 30 amp peak current). If you are boosting you are converting amperage to voltage. Your camper can draw 30 amps before the camper's breaker trips, but the Franks "sees" more than 30 amps in that case if the power is low and you are boosting. This results in an over amperage condition and it shuts down until it cools off and resets its internal breaker.
My 15K AC draws 28 amps momentarily when the fan and compressor kick on at the same time - even when NOT boosting! (then drops within 2-3 seconds to 14 amps) If the water heater is running when the AC kicks on, it will trip mine off line too.
He was running TWO air conditions AND the water heater according to his rant.
He says he called Frank (a VERY sharp electrical engineer) and complained about it shutting down under these conditions. Frank most likely told him it was normal under those conditions and not to run the water heater. Frank probably did his best to explain it to him, but if he was as obnoxious as his rant implies; just gave up on him.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW