I bought this Eco-Worthy controller now. It can handle 550W and 45Voc according to the manual. That means I can use 2 X 250W 24V panels in parallel but not in series?
The mppt demo is showing some strange numbers. I connected a 22V powersupply with an almost fully charged battery with the controller in float mode. With multimeter I measure 0.3A between the psu and the controller, and 0.3A between the controller and the battery. But MPPT DEMO is showing 7.55A PWM 7.50A Eff01%
Are the numbers wrong? Or are these numbers just from bulk mode?
The demo mode is a gimmick. Something to reassure after purchase that getting MPPT was a good thing. A waste of space and cost that should have been used better to improve the controller features. I have found it fairly accurate at showing what the Isc of the panel is only because I didn't believe it. Demo mode showed my 230w panel a amp over it's Isc so I put a meter on it to see.
The demo mode is a gimmick. Something to reassure after purchase that getting MPPT was a good thing. A waste of space and cost that should have been used better to improve the controller features. I have found it fairly accurate at showing what the Isc of the panel is only because I didn't believe it. Demo mode showed my 230w panel a amp over it's Isc so I put a meter on it to see.
Okey, so it's normal that the MPPT DEMO isn't near what the actually current is?
I was just unsure because the numbers was so high (over 7A) when I measured 0.3A. I wanna make sure it's nothing wrong with the controller and have to return it?
The demo mode is a gimmick. Something to reassure after purchase that getting MPPT was a good thing. A waste of space and cost that should have been used better to improve the controller features. I have found it fairly accurate at showing what the Isc of the panel is only because I didn't believe it. Demo mode showed my 230w panel a amp over it's Isc so I put a meter on it to see.
What is Isc?
Is demo mode pointless and useless? I thought I could read the current from the solar panel in demo mode? But my numbers are way off...
Comments
The mppt demo is showing some strange numbers. I connected a 22V powersupply with an almost fully charged battery with the controller in float mode. With multimeter I measure 0.3A between the psu and the controller, and 0.3A between the controller and the battery. But MPPT DEMO is showing 7.55A PWM 7.50A Eff01%
Are the numbers wrong? Or are these numbers just from bulk mode?
Okey, so it's normal that the MPPT DEMO isn't near what the actually current is?
I was just unsure because the numbers was so high (over 7A) when I measured 0.3A. I wanna make sure it's nothing wrong with the controller and have to return it?
Vpanel*Ipanel = Vbatt * Ibatt
Or:
Ipanel = Vbatt * 1/Vpanel * Ibatt
The equation should match to within 5% or so (typically MPPT controller is around 95% efficient at middle of the day solar power).
-Bill
-Bill
-Bill
Yes, It seems to work correctly if I don't use MPPT DEMO.
1.77A in
2.82A out
I was just confused by the high MPPT DEMO numbers.
Attachment not found.
What is Isc?
Is demo mode pointless and useless? I thought I could read the current from the solar panel in demo mode? But my numbers are way off...
Isc is used as the current value to design wire gauge / sizing.
-Bill