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Rated Power on inverter


SYC

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Hi @Chris Hobson @Coulomb

On Axpert King Inverter specs or all axpert Inverters you have rated power for PV X amount of watts, voltage and amps that should not be exceeded 

Can one exceed the rated Power for PV while staying within limits with voltage and amps? (current config 3s4p)

Example: 325w canadian 3s8p or 3s7p or 3s6p or 3s5p

If NO than why is the amps so high eg. Axpert King 80A?

Thank you in advance

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1 hour ago, sulyc said:

Example: 325w canadian 3s8p or 3s7p or 3s6p or 3s5p

Those Canadian Solar 325 W panels seem to have 132 half-cells, i.e. effectively two 66 cell panels in parallel. Voc is 43.6 V @ 25°C, so 3S is 130.8 V @ 25°C, or about 140  V @ 0°C (using a lazy 1.07 factor). That's acceptable.

1 hour ago, sulyc said:

If NO than why is the amps so high eg. Axpert King 80A?

Remember that the Axpert PV current specification is always given as battery-side. So that's at about 52 V. At say 104 V at the PV input, that current limit will be 40 A (104 V x 40 A = 4 160 W = 52 V x 80 A). So that's 4 strings of those Canadian Solar 325 W panels (assuming my quick search found the same model of panel). Even though the specifications for the Axpert King state a maximum PV array power of 4000 W, I believe that you could connect up to about 4500 W safely (based on the specifications for other models). The 4000 W given seems to be just a nominal 50 V battery times the maximum battery-side current of 80 A. But it's possible that the spate of recent PV problems could be related to too much PV array power.

But beware, higher power panels are likely to be 72-cell versions, which will overvoltage the 145 V max Solar Charge Controller if connected in 3S. (You have to connect those in 2S, using more strings). Check the Voc ratings carefully. Don't use any over 45 V Voc if you want to connect them 3S to a 145 V max Solar Charge Controller.

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