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Goodwe EM Inverter + Pylontech US3000 back-up power limits


Allsorts
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Good day,

I am hoping that the smart people on the Forum can assist me with a (most probably) simple question.

System: Goodwe 5kW EM inverter (with 2.3kW back-up) together with 2x Pylontech US3000 batteries.

My question - the battery trips when the load on the back-up side of the circuit is too high, is this trip-limit a function of the inverter or the batteries? I would like to understand if it would make a difference to add additional batteries or not.

Thanks

 

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17 minutes ago, Allsorts said:

a hair dryer and the microwave is on at the same time

There is your problem. A hair dryer is typically > 2kW, I think my wife's is rated at 2.3kW. The Microwave probably around 1kW.

Assuming there is another 200 or 300W base load, this is enough to trip both the battery and the Goodwe.

So the question is which one is tripping. Since you say it restarts after a few seconds, I would have to say it's the Goodwe tripping, because as far as I know if the Pylontech trips on over current, you need to manually reset it.

Edit: Sorry, it's actually not enough to trip the battery since the 74A (for 2 batteries) is not a hard limit, and they will not trip at that point. So definitely the Inverter tripping.

Edited by Stanley
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22 minutes ago, Allsorts said:

hair dryer and the microwave

Those are both very big loads. Those small cheapy microwave ovens are 900W and then they go up to 2000W. The hair dryer is normally 1800W or more, expect those smaller travel types. I agree with  Stanley that it is most likely the inverter. Those 2 together will trip most inverters.

Best is not to make food while drying your hair. It's better for power usage (and hygiene :) 

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Thanks everyone. The answer is then to move plugs to ensure these loads are not on the back-up circuit.

Bloody mission sorting out wiring, plugs, lights etc to get them on the right circuits in a 50-year old house that has been changed and renovated over time! Next time I install solar I would rather build a new house and start the installation from scratch..

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I have the Goodwe ES. Where it differs from the EM is (5kW versions)

- firstly the backup ability 4.6kw vs 2.3kw. So if you are on backup (i.e. no Eskom) then those loads you described will trip the Inverter not the batteries. 
 

- secondly, look in you manual the Max Aparant Power From Grid. How I understand this is that this is the power it can “pass through” to your backup loads when the grid is present. For the EM this is 5.3kVA vs 9.2kVA on the ES. So even when Eskom is on, the loads you decribe can trip the Inverter potentially if some other things are on. 
 

other things, make sure you are indeed on backup or grid tied mode and not off grid mode on the PV master app. 

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  • 2 weeks later...
On 2020/09/10 at 12:36 PM, Allsorts said:

Good day,

I am hoping that the smart people on the Forum can assist me with a (most probably) simple question.

System: Goodwe 5kW EM inverter (with 2.3kW back-up) together with 2x Pylontech US3000 batteries.

My question - the battery trips when the load on the back-up side of the circuit is too high, is this trip-limit a function of the inverter or the batteries? I would like to understand if it would make a difference to add additional batteries or not.

Thanks

 

@Allsorts the Goodwe inverter does not mess around when it comes to limiting the output on the backup side of the inverter. If I remember my manual right there is a 10A limit and the 2.3kW limit to contend with. The backup  side of the inverter I have found is happy on-grid and off-grid (load shedding) when I have kept my lights and bare essential plugs on it. This would be the fridge and freezer, TV and internet. anything else like the microwave and other general plugs just creates an unhappy inverter. the "heavy appliances I have left on the main circuit and the inverter happily feeds them power there (excluding those nasty start-up peak loads). the only down side is that during load-shedding those plugs are unavailable. but as I have found during load shedding the wife and kids are happy to have their lights, internet and TV going and will gladly suffer the indignity of no AC, microwave  for 4 hrs.

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