I think it's against the law to self-power your house, without an approved change-0ver box installed.
Otherwise, some forgetful goof might go down and reset the main relays,
BEFORE taking the generator off line. Which could be shocking to the
NStar lineman working down the street..
I think most people just plug in a lot of extension cords and wouldn't even
know how to go off-grid any other way.
Up in NH, after the days turned into weeks of no power, the Lowes
and Home Depot stores ran out of 220 plugs & sockets for generators.
So, it seems that a bunch of folks were making Suicide-Cables.
(Cables with a male plug on both ends).
~~~
When I was a sailor, we would tape warning signs over the open breakers and the control
panels for the Radar, to keep from getting zapped with microwaves
while painting near the antennas.
But there were times when it didn't work.. We would be up there painting
and suddenly we would get radiated by some dimwit.. (Non-reader?).
~~~
"The problem will be where will the excess power goes, when you use less than the solar inverter output."
If the GTI is taking 800w off the batteries, after a short while, it's going to drop the bank voltage.
The charger is going to see that low voltage and start charging the bank back up.
It's going to increase the charge current (most likely in bulk mode), which is also going to be feeding the GTI.
I think the mail problem is going to be,
limiting the amount of load that I put on to the inverters.
Since I don't want to run my bank down too low.
I don't want to try to run my Chinese GTI at 1200w.. I think 1kw might be
it's max safe limit.
So, I'll need to measure each load's worse case, making sure the sum is less than 1kw..
I think the system should be able to handle some motor start surges, if they are short..
The little one looks like it's got some good specs..
Specification:
1)Model: NC-600-P
2)Output waveform: Pure sine wave
3)Continuous power: 360-400W
4)Surge power: 600W
5)Input volt: 12V DC
6)Output volt: 110V AC
7)Frequency: 50 / 60Hz
8)Efficiency: > 86%
9)No load current draw: < 0.45A
10)Automatic protection: Overload, Short circuit, Over thermal ,Fuse ,Under/Over Volt
11)Operating temperature: -10° ~ + 50° celsius
16) Battery chip cord length: 60cm
The Powerjack GTI guys tell you NOT to connect a battery.
It will get discharged VERY quickly into the gird..
Careful load management is the only way this scheme is going to work for me.
IF I'm lucky, it will work..
My theory is:
The GTI will supply the load, as it's syncing with the Sinewave inverter.
It follows the frequency and phase, one for one.
And it will increase it's voltage a bit, to dump more power
(that's it's getting from the panels and battery bank).
But, it's got an upper limit. It will not just keep on kicking up the voltage,
into a light load.
At higher voltages, the loads will consume more, and it will be fighting
the Pure sine wave, trying to boost it's fixed voltage higher.
But, it should self-limit somewheres under 130vac. Maybe lower.