The only things MG about the car are a: the badge. And b: the indicator clicker has been made to sound like an ancient Lucas electromechanical flasher of yesteryear.
Our new MG4 can output around 7kW using the V2L mode, really handy feature. Only bummer is that it's a vehicle stationary only feature. No running the coffee machine while driving.
I'd also suggest doing the same hot day load test with the generator at or near full load: Diesels get a lot of cooling from excess combustion air when running lightly loaded.
Electrical engineer here: I've built a couple of RPCs too, including one that converts 230V single phase into 400V three phase as all our network distribution is 230/400V
Happy to answer questions on either RPCs or using VFDs and provide engineering perspective on either.
I'd guess a lot will condense in the underground line, a drop leg as it comes into the barn will catch a lot of it. Maybe a big valve for making noise on the 4th of July to remove water that's sitting in the pipe underground.
The HDPE piping system I use for compressed air at work and home says the product is suitable for underground use. Recommendations are to surround the pipe in sand, and to sleeve the pipe where it goes through foundations. I too am a fan of installing multiple ducts to allow for future changes.
It will help somewhat, I'd wager that a 3 phase motor and some capacitors would probably be even better: The compromises made when constructing single phase alternators and motors are reason for some of the harmonics. 3 phase motors are more efficient, have less mechanical vibration etc.
A 3...
Rusty, Given that your outage is probably the longest and hottest your generator has run in its life, I'd seriously consider replacing the oil filter and maybe do an oil change too. Cheap insurance for a very valuable asset (I'd argue that to you, it's worth a lot more than you paid for it)
My go to cheap LV DC load is 8 gauge steel fence wire. If my hurried maths is correct one metre on 28V is about 22kw... Probably a little spicy.
Wind a "spring" around some say 2" water pipe, try to get 20m or so on there. Stretch it out on the concrete so that turns don't short and then tap it...
Re: Power quality, I found this PQ1 Power Quality Sensor | Powerside
Unsure on price.
Otherwise I'd get an undervoltage relay from a manufacturer such as Phoenix Contact and set it to trigger at say 0.9x nominal voltage. Make sure to fit a squeaker so you know the fridge power needs resetting.
So the cheaper generators (at least in my experience) run essentially an induction motor style alternator. The capacitor supplies the leading reactive power (the VArs) which magnetises the stator allowing the rotor to be magnetised.
In this case the voltage regulation is (entirely?) achieved by...
I may have posted this one before, they powered a family of four house for 24hrs with a bunch of people on bikes
No batteries in the system, only a modest sized ultra capacitor stack to buffer the DC between the bikes and the inverters.
25kW is definitely in the realm of what's "affordable" in home solar and battery tech nowadays. Especially remembering that you don't use 25kW 100% of the time, and comparing costs with brands like Cummins, CAT, or Kubota.
Due to grid reliability, I'm about to splurge on a 12kW/15kVA 230/400V 3...
Is the bathroom heater a PTC unit? If it is then it could be drawing more than rated on startup in the cold.
I'd also check your battery connections and health, unexpected voltage drop can lead to inverters sucking scary input currents for a time.