Sunpower 435 watt panels. voc 85.6v isc 6.43A. Why does my Klein CL2000 meter show amperage higher than isc? It reads 9.56A when the panel is in the shade and facing the ground and over 12A when in full sunlight. Voltage reads fine at 79v, panel temp is approx. 40 deg. F
Why are meter amps higher than ISC?
- Thread starter hotrod796
- Start date
sunshine_eggo
Happy Breffast!
Because something is wrong with the meter or the operator.
Is it on DC amps?
Did you zero out the meter?
Have you tested it on another source?
Is it on DC amps?
Did you zero out the meter?
Have you tested it on another source?
Abodyofscience
New Member
- Joined
- Feb 21, 2022
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- 168
Half of 85.6v is 42.8v. Half of 6.43A is 3.2A.
This panel should be able to deliver 42.8 x 3.2 = 138w into a 85.6/6.43 = 13.3 ohm resistor & so the input MPPT should be 42.8v & the input current should be 3.2A.
“12A when in full sunlight. Voltage reads fine at 79v” should put out 40 x 6 = 240 w.
Modeling the panel as a current source & a forward biased diode in parallel with the source & then a series resistor, I’d say at least one of these components is changing in value.
Can’t explain the shade reading.
This panel should be able to deliver 42.8 x 3.2 = 138w into a 85.6/6.43 = 13.3 ohm resistor & so the input MPPT should be 42.8v & the input current should be 3.2A.
“12A when in full sunlight. Voltage reads fine at 79v” should put out 40 x 6 = 240 w.
Modeling the panel as a current source & a forward biased diode in parallel with the source & then a series resistor, I’d say at least one of these components is changing in value.
Can’t explain the shade reading.
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