November 5, 20241 yr Simple newbie query: Multimeter voltage directly on cable from panels 119v Multimeter voltage on MPPT inputs with above cables plugged in 53v Is this normal?
November 5, 20241 yr 1 hour ago, ClintonDBN said: Simple newbie query: Multimeter voltage directly on cable from panels 119v Multimeter voltage on MPPT inputs with above cables plugged in 53v Is this normal? How long are your cables. Did you take the voltage over the panels when they were not connected to the MPPT? How did you measure the voltage? Careful with DC. It is strong like bull.
November 5, 20241 yr It's normal for Voc to be different to Vmp but the difference sounds a bit high. Start with finding your panel specs for open-circuit voltage vs max-power Voltage. That 53V sounds like a battery charging voltage. Edited November 5, 20241 yr by GreenFields
November 5, 20241 yr 4 hours ago, ClintonDBN said: Simple newbie query: Multimeter voltage directly on cable from panels 119v Multimeter voltage on MPPT inputs with above cables plugged in 53v Is this normal? In order to help one needs to know make and model of panels and how many in series to get to 119V. As has been pointed out when measuring at the panels they are Voc. When at the MPPT they must also not be connected to ensure you comparing apples with apples. The as a 2nd reading give the V reading when connected to the MPPT and also what current is drawn from the panels to charge battery when connected. My 2c.
November 6, 20241 yr On 2024/11/05 at 11:03 PM, GreenFields said: That 53V sounds like a battery charging voltage. Yes. That sounds like the Solar Charge Controller isn't MPPT at all, but rather PWM. These connect the panels directly across the battery, only pulsing the power when the battery becomes full. If so, the panels should be reconfigured so that there isn't such a huge difference in voltage. That difference is costing a lot of potential solar power.
November 7, 20241 yr 17 hours ago, Coulomb said: Yes. That sounds like the Solar Charge Controller isn't MPPT at all, but rather PWM. These connect the panels directly across the battery, only pulsing the power when the battery becomes full. If so, the panels should be reconfigured so that there isn't such a huge difference in voltage. That difference is costing a lot of potential solar power. This seems like the spot on guidance
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