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Growatt SPF5000ES Error 52

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tangle

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Mar 4, 2022
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I have a 2.5KW of solar, one Growatt SPF5000ES, one EG4LL 48v battery and a Growatt transformer. When I turn on my 4hp Craftsman air compressor, it trips my invert and gives me an error code 52. I find this odd since my Cotek 24V 3000W inverter will run it just fine.

So I did a little test and started my band saw, chop sat, shop vac and grinder (along with my lights. At 19+A it tripped the inverter. Is this normal? Am I missing a setting somewhere? If you need more information let me know. Any help is really appreciated.
 
4hp compressor has a massive surge. I'm super impressed your Cotek can handle it.

On 120V, the Growatt is limited to 2500W, so it actually has LESS power than your Cotek. Nor are they known for their good surge performance.

In your testing, were you using a clamp ammeter with an INRUSH function?
 
sunshine_eggo said:
4hp compressor has a massive surge. I'm super impressed your Cotek can handle it.

On 120V, the Growatt is limited to 2500W, so it actually has LESS power than your Cotek. Nor are they known for their good surge performance.

In your testing, were you using a clamp ammeter with an INRUSH function?
Click to expand...
It was a clamp one, not sure about he inrush. It has a min max function.

Being kind of a newbie. At 20 amps, this is not a good choice for an off grid inverter then? If your well pump is running 10 amps and your hot water tank starts heating, it could trip the inverter. So would two inverters be better since it would give you 40 amps?
 
tangle said:
It was a clamp one, not sure about he inrush. It has a min max function.

Being kind of a newbie. At 20 amps, this is not a good choice for an off grid inverter then? If your well pump is running 10 amps and your hot water tank starts heating, it could trip the inverter. So would two inverters be better since it would give you 40 amps?
Click to expand...

Min Max don't pick up surge. There will be an INRUSH function, and those are designed to measure the peak current in a very short period of time.

I don't know the features/limits of that particular system. If you can parallel them on the input side of the transformer, then I would expect you can get there provided the AT can handle it.
 
Signature Solar told me the transformer would handle all my house.
 
Are you running the Cotek 24V 3000W inverter off of the same "one EG4LL 48v battery"?

My experience is, that you need a minimum of 2 or 3 of the EG4LL 48v batteries to start a high surge load.
The battery BMS has short circuit and overload protection built-in, when it sees that high surge it will disconnect because it thinks it is a short circuit.
 
No I am not running the Cotek with the EG4LL battery. It was from a previous solar system I had.

I really wish when I talked to Signature Solar they would have stated this. I specifically asked if it would run my garage (stated the tools) and used as a backup from my home.
 
sunshine_eggo said:
4hp compressor has a massive surge. I'm super impressed your Cotek can handle it.

On 120V, the Growatt is limited to 2500W, so it actually has LESS power than your Cotek. Nor are they known for their good surge performance.

In your testing, were you using a clamp ammeter with an INRUSH function?
Click to expand...
When checking with INRUSH it trips the inverter at ~20A when set to 240V. Signature solar had me sett the AC out to 220V and that helped (of course since it increased the amps).

This site has done more to help trouble shoot my problems than anywhere else. They should be paying you all. Thanks
 
I had the same problem,Any one has solution for bus voltage low error? Error occuered when transfering the power sources during power outage. for up to 35% Load system working fine.above the 50% of load the system fails stating error code 52
 
mihira said:
I had the same problem,Any one has solution for bus voltage low error? Error occuered when transfering the power sources during power outage. for up to 35% Load system working fine.above the 50% of load the system fails stating error code 52
Click to expand...
My problem was there is not surge capacity. 5000W/240V=20.8A. If you are pulling more than 20.8 amps, it will trip the inverter. My guess is there is a surge on yours where you pull more than 20.8 amps. You could lower the out voltage to 220V, that would increase the amps it can handle. Or you can purchase another inverter and transformer. At that price, you would be better off purchasing an EG4 inverter that has a 2x surge capacity and 1000 to 1500 more watts (get about 5 more amps out of it). The growatt inverters are really not a good solution for anything other than running your well pump.
 
There is a tea machine working on my system. At the start there is a high surge/startup voltage. Would this cause the Inverter to fail?
 
mihira said:
There is a tea machine working on my system. At the start there is a high surge/startup voltage. Would this cause the Inverter to fail?
Click to expand...
How many amps does it draw on start up? If it is more than 20 amps, them more than likely. These inverters are not ones that should be used for home use. There are better ones at a reasonable price.
 
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