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rithym1964 avatar image
rithym1964 Suspended asked

How to Calibrate MPPT 450/100 Amps reading

Is there a way to calibrate the mppt 450/100 amps by firmware perhaps?

Mine shows very confusing output numbers in VC for example as a snapshot

6213W Total by #1 & #2

Current going to battery 95.8A

Battery Voltage 57.6V

So, 6213 / 57.6 = 107.86A not 95.8A as shown. I aslo put a quality clamp meter on the 450 output cable and it shows 108A going to battery. It's no big deal and I'm happy that the unit is over performing but I don't understand how it can calculate the amps so far out, it's just simple math but it's 12% out of calibration. If my GX device is using that figure to calculate total amps produced it's a long way out every day.

I tried to post screen image of the above snapshot but I just keep getting parse failure.

rs450
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nickdb avatar image
nickdb answered ·

VRM is showing PV voltage and current, not battery current.

VC should separately show the readings for solar (PV) side and battery.

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rithym1964 avatar image rithym1964 commented ·

I never mentioned VRM at all. I am referring to VC which shows me total Watts being produced by the controller and on the rh side bar it shows me battery voltage & amps flowing to battery. Seeing that Watts = Volts x Amps then a snapshot at any time should equate those figures by the above formula, but it doesn't. eg 6000W at a battery voltage of 60V should mean the current is 100A. The example I gave initially - 6213W divided by 57.6V should equal just under 108A, but it shows 95.8A in VC which is incorrect and putting a clamp meter on the controller output cable actually shows 108A going to the battery.


I am wondering how VC is so far out of calibration in it's maths I'm sure it must be a coding error my other controllers are spot on...

I still can't upload the snapshot just getting Error 'parsing response failed'


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