Inverter/Charger Grid Backup design

[Tecnodave]

Bcroe,

they are gasoline powered, are low rpm, 1800, and do vary the throttle with loading, and do not vary the advance as far as I know, these are the older flat head generators. They are very reliable, not cost effective vs big box store generators. They will run welder so big that big box generators have a hard time with. One of my customers burned out a brand new Lincoln multifunction welder, mig, tig & stick with a Honda EM 4500 watt generator that Lincoln stated would run that welder. Normally use a Generac 13.5 kW unit but it was out of commission. Lincoln repaired or replaced the welder. It is of the inverter type that can be run on 120 or 240 with only a plug adapter change. Another customer has a Champion 7500 watt unit that struggles with that same model of welder. They run fine on the Emerald 4 at 4 kW 120 volts only. The welding work easily pays for the fuel used. I'm retired, pretired and just plain tired so I will not be replacing rne generator for that use. I'm making a portable setup for them that will use a NE-3 Onan 6.6 kW. 120/240 volt unit to power the welder for field use. The generators are cheap as dead Motorhomes are a dime a dozen here in California , Auto dismantlers don't want them due to the large amount of plastics and non recyclable components. These welder so are about $2400 ea. and are more valuable than the extra fuel used.
david

[bcroe]

Thanks for the info. Since my experiments on (crank trigger) programmable ignition
timing, I tend to look askance at any small engine that may run a lot. Bruce Roe

[Mike90250]

In the pic below, I have a eu2000 connected to a 6KVA transformer (gray box behind the red generator). The transformer is 115lbs ! The eu2000 is about 45 lbs. The eu had no trouble with the transformer and that generator was connected to an extended runtime tank outside the generator shed. i ran it nightly for about 8 or 9 days, and had no issues.
Look into the aftermarket oil filler and drain kit and extended run time fuel cap. (the eu has a suction pump and can draw fuel from another tank into the integral tank)
20180801_065800c.png

[xthread]

Nice setup Mike!
Yes I read a lot about the EU2000 before I bought mine. Those kits and the flexibilty this unit provided was one of the reason I got it.
There is also a kit to run propane out of it.

So I'll buy my transfo next because I'll need it anyway no matter which inverter I choose.

I've shop around last week and I could get an Outback Radian 8048 (8000W) for the price of a Conext XW+6848 (6800W).
Which one would you guys recommend and why?

[Mike90250]

Did you mean to type Conext XW ? or HW ? never heard of the HW

https://solar.schneider-electric.com/product/conext-xw-na-solar-inverter/

I'm biased toward the XW, having owned for for 9 years and worked the heck out of it. My opinion is the XW has a better real life surge capacity than the Radian. Often the deciding factor is the control gear, and features you need or integrating it with other bits and pieces.

[xthread]

Oups I meant XW+.
For interface/control, it basically comes down to the Combox vs OpticsRE for remote monitoring and Conext SCP vs Mate3 for Control Panel.
I'll try to find videos of them in use to make my own ideas.

Features are looking pretty much the same looking with my NeverOwnedAnInverterBefore eyes.

[neweclipse]

If autotransformer is needed strictly to operate a 240 volt deep well pump then autotransformer can be left out of circuit and be only brought into circuit by the water pump's pressure switch for duration of pump run cycle...then when done pumping dropped out of circuit again...zero standby losses that way, besides being sized much smaller to match the one pump load, or even cares of any neutral.

[Tecnodave]

neweclipse,

Yes that can be done , I would switch both legs of the Autotransformer input, most pressure switchs have two sets of contacts.
David