October 1, 2023
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MSXV full array with 5x2 MPPTs, moderate sunlight charging 36s Li-Ion pack: 130V, 2.264A
Individual Testing Dec 17, 2022
tested w protective cover on,
Open circuit voltage test
Short circuit current test
Stack 12
100 mA, 9.5 V
Stack 11
35 mA, 9.15 V
(2 halogen lamp) 10.18 V, 0.5 A
Stack 9
18.04 V, 0.42 A
Stack 11 + 9
27.88 V, 0.45 A
Testing w MPPTs
Stack 9 + 11 + 12
29.993 V, 0.163 A
5.322 Whttps://docs.google.com/spreadsheets/d/10GxkmC2_pRBlaSkuodyuwJfv6EmfgCdq5ilaQ_U7_Z8/edit?usp=sharing
Individual Panel Testing
Each MPPT was individually connected to their respective panels according to the table below.
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The output voltage was adjusted to the target voltage, and connected to a 8p battery to confirm operation. The MPPT was considered working if the output voltage is higher than the input, and the output power was > 20% of the rated panel power (it was quite cloudy).
10 MPPTs worked, while 3 had shorted ICs
Array Testing
Two strings of 5 MPPTs were connected in series in accordance with the previous table, which were paralleled with 2 Si diodes into a 36p pack.
In moderate sunlight at about 4:30pm, the output of the whole array was 130V, 2.264A.
Given the suboptimal conditions, the power level seems to be about what is expected. The Nomura MPPTs are confirmed to be working normally.
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