Solar cell off grid installation problems

[Peterphuket]

A dilemma,

In May 2021 I bought a solar installation with 2x 260Ah lithium batteries, 2 Must 5.5 kW hybrid inverters and 12 solar panels with an average output of 500W each.
From one moment to the next, the 2 inverters refuse to work, it looks like a software error, but that is irrelevant when considering what to do.
The supplier gives me the option of having them repaired for 4000 Thb each, the purchase price at the time was 24000 Thb each.
My average consumption before was 2500 Thb/month in monetary terms.
Today I can buy a new inverter with a capacity of 11 kW for 22000 Thb.
Now I ask myself, what is the best solution, have both inverters repaired, 2x4000 Thb + shipping, so more than 10000 Thb, then I will have the same ones back, but the question remains, how long they will work, 2. buy the new inverter at a price of 22000 Thb, or 3. Just go back on the public grid for 2500 thb/month.

I know that there are some good solar cell users out there, and that is what I like to know, what you will do in my situation.

[BritManToo]

It's never a good idea linking them together.

Have you tried disconnecting one and the link between them?

What makes you think they are both broken?

 

Turn them both off

Switch off the breakers (panels/battery/grid in/inverter out) for one

Disconnect the link cable

 

Then turn the connected one back on.

[CharlieH]

MOVED to Alternative Energy forum

[atpeace]

11 hours ago, Peterphuket said:

A dilemma,

In May 2021 I bought a solar installation with 2x 260Ah lithium batteries, 2 Must 5.5 kW hybrid inverters and 12 solar panels with an average output of 500W each.
From one moment to the next, the 2 inverters refuse to work, it looks like a software error, but that is irrelevant when considering what to do.
The supplier gives me the option of having them repaired for 4000 Thb each, the purchase price at the time was 24000 Thb each.
My average consumption before was 2500 Thb/month in monetary terms.
Today I can buy a new inverter with a capacity of 11 kW for 22000 Thb.
Now I ask myself, what is the best solution, have both inverters repaired, 2x4000 Thb + shipping, so more than 10000 Thb, then I will have the same ones back, but the question remains, how long they will work, 2. buy the new inverter at a price of 22000 Thb, or 3. Just go back on the public grid for 2500 thb/month.

I know that there are some good solar cell users out there, and that is what I like to know, what you will do in my situation.

Buy the new inverter and have someone local install it.  I assume the batteries are LifePo4 and if 48v, you have already sunk quite alot into your solar setup.  Our electric consumption is about the same( my electric bill would be about 3-4k).  I use th same Anern inverter brand  as BritmanToo and have had no issues.  It produces 6.5kw and can handle 8.5 kw of solar.  It cost 13k.  

 

Recomendation and I'm far from an expert 🙂

* Run your hot water heaters from the grid.  Only cost about 100 baht a month and eliminates the need to have a huge inverter.  Togther my hot water heaters can draw 7,000 watts!

 

[Peterphuket]

11 hours ago, BritManToo said:

It's never a good idea linking them together.

Have you tried disconnecting one and the link between them?

What makes you think they are both broken?

 

Turn them both off

Switch off the breakers (panels/battery/grid in/inverter out) for one

Disconnect the link cable

 

Then turn the connected one back on.

Thank's for your advice, yes

all those things you mention I have already tried, had one after the other on the workbench, with connecting and booting they both immediately come into a pulsing mode, it tries to boot at one-second intervals time after time, separated from each other they both do exactly the same thing, that is why I am thinking of a software error.
It happened when I switched off the batteries in the evening, due to the fact that otherwise they would go below 20%. at night, normally I switch them back on after 10 seconds, but then it went wrong.
The inverters have the disadvantageous habit of not automatically switching back to the grid after that 20%, so I sometimes have to do that myself, it was just after 2 rainy days

 

[Peterphuket]

7 hours ago, CharlieH said:

MOVED to Alternative Energy forum

I tried to find that, and it's not the first time I can't find the right topic, if I go to ‘Create-Topic’ the desired forum is not there.

[Peterphuket]

11 hours ago, BritManToo said:

It's never a good idea linking them together.

Have you tried disconnecting one and the link between them?

What makes you think they are both broken?

 

Turn them both off

Switch off the breakers (panels/battery/grid in/inverter out) for one

Disconnect the link cable

 

Then turn the connected one back on.

By the way, these 2 Must inverters have the option of connecting them in parallel through a separate module, which is what I have done.

[BritManToo]

37 minutes ago, Peterphuket said:

It happened when I switched off the batteries in the evening, due to the fact that otherwise they would go below 20%. at night, normally I switch them back on after 10 seconds, but then it went wrong.

I have my battery on all the time and just set the lower cutoff voltage in the battery BMS.

 

My very cheap PowMr hybrid inverter has been running 3+ years now.