75 | 10 MPPT with a DC Power Supply

Modifications
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1

Hello,

I am trying to design an experiment to simulate a solar power system design in a lab setup. I have hooked up the following components:

  1. Victron MPPT 75 | 10
  2. B&K Precision 8600 [electronic load connected to ‘Load’ on MPPT]
  3. B&K PVS60085MR [a DC power supply built to replicate solar panel power supply, expensive and sophisticated piece of lab equipment that provides power output based on an IV curve you input along with other solar panel characteristics]
  4. Tenergy Battery Li-ion 3-cell 10.8V

I am running the DC supply on approximately 24V, 1.5A, simulating a solar panel. When connected with the MPPT, the current draw keeps changing erratically, as if the MPPT fails to fixate on the Max Power Point. The variation in the amount of voltage and current received by the MPPT from my DC power supply has such a large range that it varies over, almost every second, that it is hard to quantify it for my lab data/ power budget.

Even though I supply 1.5A max current capability and set the E-load to 5-10 W power draw, the MPPT just fails to draw the full 1.5A current capacity and does not charge my battery and barely supplies the Eload with it’s required power draw. I would like to understand why that happens, why doesn’t it charge the battery, when the DC supply is capable of providing extra amperage on demand?

What are the possible solutions to quantify my data and/or get a steady power point?

I know I might not have been able to supply all info from my experimental setup, so please ask any necessary follow-up questions to help reach a viable solution. Thank you.

2

Hello, you can try 5-10ohm resistor, between power supply and Mppt charger.

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