Solar inverter on generator or on battery inverter?

[phil59]

For example, putting another inverter, pc type, to simulate a phase is not possible, you will burn out the phase "simulator"....

[Christophe]

Are you 100% sure?

Is this your last word?

[phil59]

[Remundo]

the gentleman explains the danger that I raised.

In the absence of a consumer, the injection inverters push blindly into the device simulating the phase, the latter may burn out.

It also exposes "the solution"; an inverter hybrid can act as a master and manage other injection inverters as slaves.

[Christophe]

Yes ok it's risky so... Note that they talk about micro inverter and not a centralized inverter...

Micro inverters are necessarily less sophisticated in terms of management than a centralized inverter like mine, worse they necessarily have slightly different voltages and powers (shading...)...

I'm ready to take the risk of burning out the simulator inverter but I wouldn't like to burn out my solar inverter or my battery charger...or the house!

I prepare the diagram.

Now I've seen used hybrid inverters under $500!

The problem is that I have a 72V battery to plug into it and it's either too high or too low for the hybrid inverters I've seen (they work at 24, 48V or more than 100V battery. ..)...to be continued !

[Forhorse]

Try it, tell us...

Anyway, it's not the solar inverter that risks much, since it is explicitly designed to be connected in parallel to a current source. (and that it is armored with protections of all kinds)

On the other hand, for the simulator inverter...
Like that quickly I would say that it is not especially the "inverter" part in itself which risks the most.
On the other hand, if all of the power supplied by the PV is not consumed and the voltage of the "network" begins to rise, the voltage of the DC bus of the pilot inverter will also rise, there is a risk of smoking.

It's still an interesting experience.
If I had to, I would do the following:
- Do this at the end or the beginning of the day when the PV field produces little (so as not to play with too high powers to start with)
- Do not connect the pilot inverter directly to the PV inverter, but go through one or a group of incandescent lamps in series in the circuit (a few good old 100W bulbs in parallel for example) which will act as "ballast" if something should go wrong.
- Place a few measuring devices at different strategic locations (AC network, DC bus of the pilot inverter, etc.) in order to monitor what is happening and possibly understand why it smoked.
- Provide several loads to vary the consumption in order to observe what happens in the different scenarios.

[phil59]

Now I've seen used hybrid inverters under $500!

The problem is that I have a 72V battery to plug into it and it's either too high or too low for the hybrid inverters I've seen (they work at 24, 48V or more than 100V battery. ..)...to be continued !

Hybrid inverters, you can find them on ali for less than €500 new, there were even 3-4 months ago at around €250, for a 3kW, and half in prod on battery ..... ....

Well, they are not terrible, I had asked a specialist, who has been installing panels for X years, and had not advised me to take this at all, he is a purist, but my micro inverters come from ali , and no worries, just a breakdown when unpacking, which I got reimbursed ...
And besides I bought the components to change, 4-5 €, not done yet.

A little over a year ago, micro inverters cost me about €35, with delivery ...

[phil59]

Often, on LBC, what I see, in hybrid, are those that you find on Ali... So beware, take a real known brand, to get your money's worth...

The lifespan is about 10 years, 15 at the most, in general ....
A 500€ thing, with 10 years, is not a good plan, in my opinion, and you will probably have to flash it to update the internal software, if possible ....

[Christophe]

Now I've seen used hybrid inverters under $500!

The problem is that I have a 72V battery to plug into it and it's either too high or too low for the hybrid inverters I've seen (they work at 24, 48V or more than 100V battery. ..)...to be continued !

Hybrid inverters, you can find them on ali for less than €500 new, there were even 3-4 months ago at around €250, for a 3kW, and half in prod on battery ..... ....

Well, they are not terrible, I had asked a specialist, who has been installing panels for X years, and had not advised me to take this at all, he is a purist, but my micro inverters come from ali , and no worries, just a breakdown when unpacking, which I got reimbursed ...
And besides I bought the components to change, 4-5 €, not done yet.

A little over a year ago, micro inverters cost me about €35, with delivery ...

I just found this on lbc:

Screenshot 2022-08-31 at 10-27-22 Hybrid Solar Inverter 3000 VA tromperie.png (335.23 KiB) Viewed 1843 times

Swinging it sticks to LBC's T&Cs, do you think?

[Christophe]

Try it, tell us...

Anyway, it's not the solar inverter that risks much, since it is explicitly designed to be connected in parallel to a current source. (and that it is armored with protections of all kinds)

On the other hand, for the simulator inverter...
Like that quickly I would say that it is not especially the "inverter" part in itself which risks the most.
On the other hand, if all of the power supplied by the PV is not consumed and the voltage of the "network" begins to rise, the voltage of the DC bus of the pilot inverter will also rise, there is a risk of smoking.

It's still an interesting experience.
If I had to, I would do the following:
- Do this at the end or the beginning of the day when the PV field produces little (so as not to play with too high powers to start with)
- Do not connect the pilot inverter directly to the PV inverter, but go through one or a group of incandescent lamps in series in the circuit (a few good old 100W bulbs in parallel for example) which will act as "ballast" if something should go wrong.
- Place a few measuring devices at different strategic locations (AC network, DC bus of the pilot inverter, etc.) in order to monitor what is happening and possibly understand why it smoked.
- Provide several loads to vary the consumption in order to observe what happens in the different scenarios.

Yes I quite agree with all that...the question is whether the high safety voltage of the solar inverter will be tolerated by the simulator inverter...

The first wiring I would do at night simply with 0 PV production! Just to see how the inverter reacts... Well I'll do the diagram so that you understand my idea better...

I took a 4000W pure sine simulator inverter (4000 Chinese so 2000W in real life... )...I may be going to take a less powerful one because if it's to grill it (the 4000W was also for the trailer...)

ps: not understood the history of the bulbs...??