I have just received a 600W MPPT grid-tied inverter from Aliexpress [22-60VDC, 220V AC] (see link) and I would like to test it without solar panels.
In order to do that I have thought of using a 8S 2P 18650 battery in combination with a DC-DC buck [Input: 8-36V ; Output: 1,25-32V] with current regulation (max. 5 A) (see link).
The battery could be connected directly into the inverter, but this would inquire the max. load 600W at which the cells would most likely be unable to deliver (insufficient voltage) and If possible, the current through the cells would be so high that they would overheat and easily get damaged. My expectation is that the buck current regulation is the same as a limit and therefore the cells never operate at more than 1C, doable for 18650.
In between the buck and the grid tied inverter I will place a wattmeter [working voltage: 0-60V] (see link) to monitor the discharge and know how far I can go with the test given that the battery will have no BMS. To mitigate battery damage I will use cells from the same batch all top charged recently to full capacity; meaning at 1 single discharge voltage differences should not be too big.
I wonder only what the MPPT function can do to the buck converter or else, what the buck can do to the MPPT function of the inverter. I would like to run this test for at 50% of the battery capacity.
Hope you enjoy this explanation and please point me red flags If you see something wrong.
In order to do that I have thought of using a 8S 2P 18650 battery in combination with a DC-DC buck [Input: 8-36V ; Output: 1,25-32V] with current regulation (max. 5 A) (see link).
The battery could be connected directly into the inverter, but this would inquire the max. load 600W at which the cells would most likely be unable to deliver (insufficient voltage) and If possible, the current through the cells would be so high that they would overheat and easily get damaged. My expectation is that the buck current regulation is the same as a limit and therefore the cells never operate at more than 1C, doable for 18650.
In between the buck and the grid tied inverter I will place a wattmeter [working voltage: 0-60V] (see link) to monitor the discharge and know how far I can go with the test given that the battery will have no BMS. To mitigate battery damage I will use cells from the same batch all top charged recently to full capacity; meaning at 1 single discharge voltage differences should not be too big.
I wonder only what the MPPT function can do to the buck converter or else, what the buck can do to the MPPT function of the inverter. I would like to run this test for at 50% of the battery capacity.
Hope you enjoy this explanation and please point me red flags If you see something wrong.