Vevor Inverter.

Squall445 · Nov 2, 2022

My vevor inverter 3-9000w inverter, is as far as Im aware, set to run off battery as priority. If its connected to utility tho, it runs off that, I can manually switch off utility & it will run happily from battery but after a few hours, shuts down, completely. So I switch utility back on & the batteries are still full. Im fairly sure the settings are correct. I have 4 x 90amh & 1 165amh at 12v. Wiring is 35mm, mppt 100amp, renogy solar 2 x 175. Im running a hot tub off it with a max load of 1400w. For the most part tho its just the filter running & this barely registers as a load at all on the inverter.

It's perplexing.

Thank you in advance.

Mattb4 · Nov 2, 2022

Likely your batteries are discharged below the low battery cutoff voltage for the inverter. You would want to test your battery voltage at that point (using DMM) after resting for an hour before turning on the utility charging. Once it begins to charge any reading of voltage will not give an accurate battery SOC.

BTW, if you do experience a load of 1400w and your battery capacity and cabling to the inverter is insufficent to carry that, plus startup surge, than the resultant voltage drop could also cause a low voltage inverter shut off. Your battery could still be charged but it had too much demand.

shavermcspud · Nov 2, 2022

Need info on how the batteries are cabled seeing as they are different Ah, you only have a usable 3.1kWh of battery so a couple of hours at 1400 Watts plus overheads isnt far off reaching the cut off voltage of the inverter if the batteries aren't fully charged to start with.

timselectric · Nov 2, 2022

The inverter they stated is 12v. So, the batteries are wired in parallel. (Different ah doesn't matter) so, it's a little over 7.3kwh battery bank. (If fully charged)

Squall445 · Nov 2, 2022

Mattb4 said:
Likely your batteries are discharged below the low battery cutoff voltage for the inverter. You would want to test your battery voltage at that point (using DMM) after resting for an hour before turning on the utility charging. Once it begins to charge any reading of voltage will not give an accurate battery SOC.

BTW, if you do experience a load of 1400w and your battery capacity and cabling to the inverter is insufficent to carry that, plus startup surge, than the resultant voltage drop could also cause a low voltage inverter shut off. Your battery could still be charged but it had too much demand.

The 1400w is absolute maximum, & also, its not on for longer than 20mins as its very well insulated.
My problem is that the inverter is favoring utility over battery & how its set up, it shouldnt be.

Mattb4 · Nov 2, 2022

Squall445 said:
The 1400w is absolute maximum, & also, its not on for longer than 20mins as its very well insulated.
My problem is that the inverter is favoring utility over battery & how its set up, it shouldnt be.

What are your transfer to utility and transfer to battery voltages set at?

Lilikoi_Heavy_Industries · Nov 2, 2022

Squall445 said:
The 1400w is absolute maximum, & also, its not on for longer than 20mins as its very well insulated.
My problem is that the inverter is favoring utility over battery & how its set up, it shouldnt be.

Did you contact "vevor" about these problems? Why do people buy from unknown random companies in china that apparently sell everything under the sun?

Squall445 · Nov 2, 2022

Mattb4 said:
What are your transfer to utility and transfer to battery voltages set at?

Im not sure, there are parameters set out in the set up, which I followed. I confuse easily

Squall445 · Nov 2, 2022

Lilikoi_Heavy_Industries said:
Did you contact "vevor" about these problems? Why do people buy from unknown random companies in china that apparently sell everything under the sun?

I did contact vevor.co.uk but because I hadnt bought it directly from them, they weren't helpful.

Squall445 · Nov 3, 2022

Mattb4 said:
What are your transfer to utility and transfer to battery voltages set at?

10.5 to utility & 12.5 battery.

Squall445 · Nov 3, 2022

Mattb4 said:
What are your transfer to utility and transfer to battery voltages set at?

10.5 to transfer to utility, 12.5 for transfer to battery. I think its working now, I adjusted the transfer down. I hadnt noticed one of the settings requires you to shut down the inverter completely for the change to 'stick'

Thank you for you help ?

Mattb4 · Nov 3, 2022

Squall445 said:
10.5 to utility & 12.5 battery.

I would change the low setting if you have the ability. 10.5 is a really drained battery.

Squall445 · Nov 3, 2022

Mattb4 said:
I would change the low setting if you have the ability. 10.5 is a really drained battery.

What would you recommend? 11.5?

schmism · Nov 3, 2022

11.5 low voltage cutoff.
13.0 absorption
12.5 float

Vevor Inverter.

Squall445

New Member

Mattb4

Solar Wizard

shavermcspud

Solar Enthusiast

timselectric

If I can do it, you can do it.

Squall445

New Member

Mattb4

Solar Wizard

Lilikoi_Heavy_Industries

Solar Enthusiast

Squall445

New Member

Squall445

New Member

Squall445

New Member

Squall445

New Member

Mattb4

Solar Wizard

Squall445

New Member

schmism

Solar Addict

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