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8kw Deye invertor with generator


R Cerva
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Hi.  Hope you all well.

I've got 2 x Deye 8kw invertors in parallel.  I'm connecting generator on 1 invertor and tick the box to use the generator input as generator.  The generator voltage is 225V and 50.2Hz.

I've ticket the boxes to use generator to charge the batteries.  8 x US3000 pylontech.  System work mode I've selected all time period's to use generator.  The invertors don't want to charge the batteries when generator running.  

Any advise or someone I can contact in South Africa to get technical advise.

Thanks

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So... we had Shabir (local technical expert for Deye) out at my property in December fiddling with settings to do exactly this.

At first glance the generator needs to be able to power the ENTIRE system (load + charging). Even though we set the power to be drawn from the inverter well below the generator's rated output it still doesn't work. Shabir mentioned that the problem is likely that the Automatic Voltage Regulator on the genny causes the frequency to shift too rapidly for the inverter's liking... so the inverter puts load on the genny, the genny responds by accelerating the throttle which shifts the frequency outside of bounds and the inverter drops the load. This is at my office.

At my house I have a site genny (no AVR) connected. By fiddling with the throttle adjustment I can pin the frequency so that the genny stays connected to the inverter under load.

I don't know if this is the total answer.

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  • 9 months later...

I ran into the same problem: my 8kW Deye inverter became very unhappy with the generator on the input. So, inspired by PaulinNorthcliff's remark above about 'fiddling with the throttle' I set about finding my generator's speed control, and soon found it, by pushing and tugging on springs and levers (with the generator running) until I found something that affected the speed, and tracing that to a set screw. Then, with a heater drawing a few kW to load it down (directly plugged into the generator, not connected to the inverter yet), I monitored the frequency - it was about 53Hz under load - and adjusted it down to 50Hz. After this I unplugged the heater and flipped the switch to connect the generator to the inverter input. And as PaulinNorthcliff suggests, we set it to draw well below the generator's rated output capacity. Because the inverter presents a constant load, the generator now maintains a reasonably stable speed, and happiness reigns supreme.

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  • 3 months later...

I have tested just about all the settings and still the inverter does not pick up the genny 

Its connected to the gen port but still the inverter does not pick up the generator

Its a 8kva Deye and a 5.5 generator

Ive tried it with no load and still it does not want to charge the batteries at all

I can hear a click once the generator runs on the inverter but no icon of a generator nor charging?

Any ideas or a setting thats not correct?

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  • 2 weeks later...
On 2022/01/25 at 3:07 PM, Mahdi said:

its related to frequency and it should be earthed i think

what should be earthed ? what are you referring to ?

 

On 2021/01/14 at 8:42 AM, Stanley said:

If the inverters are connected in parallel, shouldn't the generator be connected to both inverters?

On 2021/01/14 at 10:10 AM, R Cerva said:

Hi.  I read somewhere or was told by other installer, can't remember, to connect generator only to 1 invertor.  It's small 5kva generator just to charge the batteries and not to carry the full load.

I tried connecting Generator to 1 of 2 8k Deye parallel single phase inverters, waited for a lot of time but inverter never switched to generator, as soon as I connected the generator to the second inverter, 30 seconds and the inverters switched to generator input. so for me I have to connect generator to all parallel inverters.
 

 

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On 2021/01/15 at 7:48 AM, PaulinNorthcliff said:

So... we had Shabir (local technical expert for Deye) out at my property in December fiddling with settings to do exactly this.

At first glance the generator needs to be able to power the ENTIRE system (load + charging). Even though we set the power to be drawn from the inverter well below the generator's rated output it still doesn't work. Shabir mentioned that the problem is likely that the Automatic Voltage Regulator on the genny causes the frequency to shift too rapidly for the inverter's liking... so the inverter puts load on the genny, the genny responds by accelerating the throttle which shifts the frequency outside of bounds and the inverter drops the load. This is at my office.

At my house I have a site genny (no AVR) connected. By fiddling with the throttle adjustment I can pin the frequency so that the genny stays connected to the inverter under load.

I don't know if this is the total answer.

I tried to limit current draw on Grid input while grid is connected and it works perfectly, so I disconnected the grid and connected the generator to the grid input and draw limit didn't work, all the load was on generator, I checked the frequency and it was a stable 50.5 for the Grid, while the generator had unstable frequency between 52.2 & 53.6,

I tried the same thing but on generator input, so I connected Grid to generator input and then Generator to generator input and current limit only works when frequency is stable.

if you want to try it keep in mind all this testing was done with grid feed disabled.

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On 2021/10/18 at 3:13 PM, Kladrie said:

I ran into the same problem: my 8kW Deye inverter became very unhappy with the generator on the input. So, inspired by PaulinNorthcliff's remark above about 'fiddling with the throttle' I set about finding my generator's speed control, and soon found it, by pushing and tugging on springs and levers (with the generator running) until I found something that affected the speed, and tracing that to a set screw. Then, with a heater drawing a few kW to load it down (directly plugged into the generator, not connected to the inverter yet), I monitored the frequency - it was about 53Hz under load - and adjusted it down to 50Hz. After this I unplugged the heater and flipped the switch to connect the generator to the inverter input. And as PaulinNorthcliff suggests, we set it to draw well below the generator's rated output capacity. Because the inverter presents a constant load, the generator now maintains a reasonably stable speed, and happiness reigns supreme.

my generator has an AVR and I cant fiddle with, but I have couple of 3KW and 5KW double conversion UPS, my solution is to try and connect UPS to generator and then connect the 2 8k parallel inverters to the UPS, UPS should provide a stable 50hz pure sinewave 230V & I'll limit draw to 4KW. what do you guys think ? will it work ?

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19 minutes ago, TimCam said:

In settings "Grid", adjust High Voltage = 265, Low Voltage = 180, High Hz = 53.8, Low Hz =47, and see if this helps?

I have already set
High Voltage = 265
Low Voltage = 170
High Hz = 56

Low Hz = cant remember but definitely under 49

 

do you want me to try exact numbers ? or just make the boundaries over the unstable frequency ?

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48 minutes ago, MRACHINI said:

I have already set
High Voltage = 265
Low Voltage = 170
High Hz = 56

Low Hz = cant remember but definitely under 49

 

do you want me to try exact numbers ? or just make the boundaries over the unstable frequency ?

Put the Low Hz to 47, and try.

The settings I've used work on my SunSynk 8.8 kW inverter, but I feed it into the Grid input via a change-over switch.

This is for when the power is off for many days of bad weather.

One day I need to wire it into the AUX port and check. :)👍

 

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48 minutes ago, TimCam said:

Put the Low Hz to 47, and try.

The settings I've used work on my SunSynk 8.8 kW inverter, but I feed it into the Grid input via a change-over switch.

This is for when the power is off for many days of bad weather.

One day I need to wire it into the AUX port and check. :)👍

 

just checked it is already 47-55

Voltage is 170-265

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2 hours ago, MRACHINI said:

my generator has an AVR and I cant fiddle with, but I have couple of 3KW and 5KW double conversion UPS, my solution is to try and connect UPS to generator and then connect the 2 8k parallel inverters to the UPS, UPS should provide a stable 50hz pure sinewave 230V & I'll limit draw to 4KW. what do you guys think ? will it work ?

so the UPS thing didnt work, it still put all the load on the ups, it had had 50hz stable...

 

i really need a solution, already contacted deye support but they take forever to reply and when they reply it is something I already told them i did like the "decrease the Generator Input Rated Power".

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5 hours ago, MRACHINI said:

my generator has an AVR and I cant fiddle with

On the AVR in the generator, there is an 18 turn pot. you can adjust to fine tune the voltage via feedback to the coil.

The AVR is normally filled with potting compound (looks like black resin), but the  18 turn pot is normally sticking its screw head out.

As @Kladrie has said, the running (RPM = Frequency Hz) can be manually adjusted with a set screw, much like the idle screw on old cars.

Any adjustments on the generator while it is running, must be done carefully as you could loose body parts or be shocked.  😲

You'll of course need a multimeter with Hz, to check an adjust the generator.

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6 hours ago, MRACHINI said:

so the UPS thing didnt work, it still put all the load on the ups, it had had 50hz stable...

 

i really need a solution, already contacted deye support but they take forever to reply and when they reply it is something I already told them i did like the "decrease the Generator Input Rated Power".

I'm not sure about Deye but I know that there is an issue with Sunsynks in parallel and connecting a generator on the AUX port. If you want to use a gen then the one inverter needs to be made into a dedicated charging unit with no parallel comms between the inverters. It's possible that Deye is the same 

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I have had similar issues with connecting my 6.5kw petrol generator to my inverter. 

I suspect that it is due to the grid frequency of the generator changing too quickly when put under load and the inverter being unable to keep up with the frequency changes and kicking out as a result.

I have fiddled around with AVR settings for Voltage and the throttle settings for frequency settings and also changed the settings on the inverter but suspect that the issue has more to do with the instability of the frequency than anything else.  

 I would like to know if anyone has tried an inverter generator with a Sunsynk/Deye  and if it is any more stable than an AVR type generator? 

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16 hours ago, TimCam said:

On the AVR in the generator, there is an 18 turn pot. you can adjust to fine tune the voltage via feedback to the coil.

The AVR is normally filled with potting compound (looks like black resin), but the  18 turn pot is normally sticking its screw head out.

As @Kladrie has said, the running (RPM = Frequency Hz) can be manually adjusted with a set screw, much like the idle screw on old cars.

Any adjustments on the generator while it is running, must be done carefully as you could loose body parts or be shocked.  😲

You'll of course need a multimeter with Hz, to check an adjust the generator.

I don't think its a Hz issue, since using the pure sinewave UPS with very stable 50hz as generator didn't work

12 hours ago, Leshen said:

I'm not sure about Deye but I know that there is an issue with Sunsynks in parallel and connecting a generator on the AUX port. If you want to use a gen then the one inverter needs to be made into a dedicated charging unit with no parallel comms between the inverters. It's possible that Deye is the same 

its more likely to be an issue with inverter hardware or software, I could try to disconnect parallel inverters and only use 1 to make sure its a parallel thing. is there a way to disconnect 1 inverter without shutting down output from the master inverter ?

 

also I already have a 5.5Kw sorotec inverter used just for charging batteries from generator,

and already ordered a smaller 6KW deye to use as battery charger from generator, because I want the charging from generator to be included in solarmanpv.com results,

but I don't think a none parallel inverter will work with solar-assistant.io since they state that all inverters should be parallel to be included even when each inverter needs its own connection to the Host RaspberryPi.

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1 hour ago, MRACHINI said:

I don't think its a Hz issue, since using the pure sinewave UPS with very stable 50hz as generator didn't work

its more likely to be an issue with inverter hardware or software, I could try to disconnect parallel inverters and only use 1 to make sure its a parallel thing. is there a way to disconnect 1 inverter without shutting down output from the master inverter ?

 

also I already have a 5.5Kw sorotec inverter used just for charging batteries from generator,

and already ordered a smaller 6KW deye to use as battery charger from generator, because I want the charging from generator to be included in solarmanpv.com results,

but I don't think a none parallel inverter will work with solar-assistant.io since they state that all inverters should be parallel to be included even when each inverter needs its own connection to the Host RaspberryPi.

It's a bit of a process to separate them. But it can be done. I have installed about 4 generators with a single Sunsynk and they worked fine. 

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