My backup system for load-shedding (grid failure).

[solarman1]

Hi,
I installed this backup system. I need some feedback on the installation to ensure everything is OK. I used:

• KODAK Solar Off-Grid Inverter King with UPS 5kW 48V (Axpert)
• 4 x 240Ah omnipower batteries.
• 50mm2 Battery Cable
• 80A Fuse on + battery cable

Inverter Settings (Axpert):
Program 1 : Utility first (default)
Program 2 : 20A
Program 5 : User
Program 11 : 20A
Program 26 : 56.4V
Program 27 : 54.8V
Program 29 : 44.60V

Datasheets attached. The kodac is from Axpert factory so settings are the same.

 

[jasonhc73]

That Kodak label reminds me of when I was a kid. Coca Cola sunglasses were all the rage, and many of us ran around wearing CacaCola sunglasses.

This inverter is the same as MPP Solar. (I have Mpp Solar LV5048, also manufactured by Axpert)

Are the batteries used or new?
I have mine set program 1 to SOL (It switches to Util if sol is not there)
I have program 2 at 10A (but I do have 2 in parallel so it is 20A in the end)
Do bulk (program 26) at 57.6V to 58.8V, the spec sheet indicates 14.4, so 57.6V is what to use.
Do float (program 27) at 54.4 to 55.2V, the spec sheet indicates 13.65, so 54.6V is what to use.
program 29, 43.2 is the absolute minimum. (That means less than 500 cycles though), I would be fine with 47V.

Do you have any idea what your discharge rate might be in the C rate? (How many amps do you think you will use?)

If you never draw more than 20amps, you should get 8-10 years of good use out of these.

Max charge Current is shown as 0,25C, so a 240 Ah, that would be 60 amps (program 2)

 

[nwillitts]

what are the batteries?

 

[JoeHam]

what are the batteries?

Looks like OmniPower AGM according to the data sheet

 

[solarman1]

Yes Omnipower AGM.

 

[solarman1]

That Kodak label reminds me of when I was a kid. Coca Cola sunglasses were all the rage, and many of us ran around wearing CacaCola sunglasses.

This inverter is the same as MPP Solar. (I have Mpp Solar LV5048, also manufactured by Axpert)

Are the batteries used or new?
I have mine set program 1 to SOL (It switches to Util if sol is not there)
I have program 2 at 10A (but I do have 2 in parallel so it is 20A in the end)
Do bulk (program 26) at 57.6V to 58.8V, the spec sheet indicates 14.4, so 57.6V is what to use.
Do float (program 27) at 54.4 to 55.2V, the spec sheet indicates 13.65, so 54.6V is what to use.
program 29, 43.2 is the absolute minimum. (That means less than 500 cycles though), I would be fine with 47V.

Do you have any idea what your discharge rate might be in the C rate? (How many amps do you think you will use?)

If you never draw more than 20amps, you should get 8-10 years of good use out of these.

Max charge Current is shown as 0,25C, so a 240 Ah, that would be 60 amps (program 2)

10h rate is 200AH

I'm running 5 laptops, and 2 modems and a bar fridge off the system,