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Have a test setup with 2 x 50 watt panels in series linked to a Renogy Rover 20 A MMPT. Having trouble trying to figure out exactly how much power I'm actually getting from this 100 watt setup. Has anyone run controlled measurements on actual energy conversion efficiency? That is, given 100 watt rated solar panels, what percentage actually makes it into the battery (on an ideally sunny day)? I've read figures around 75%. Curious to know what others are achieving.
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One big factor is the PV cell temperature. If it's cold and sunny, you might see 90 - 95% out of the controller into the batteries. Batteries have their own efficiency losses though.
On a hot sunny day, you could lose 25+ % of the panel's rating plus the battery's losses.Last edited by littleharbor2; 01-22-2024, 01:16 PM.2 Kw PV Classic 200, Trace SW 4024 460ah, -
Also there could be some panel loses due to the efficiency of the charger. A true MMPT will provide more to the batteries then a cheaper PMW type which could reduce the output by 33%.Comment
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It depends on how much overheard your inverter requires. I have a Generac PWRCell inverter and the typical night time consumption for the box to operate is no more than 7w (from the marketing glossy). I'd say that pretty much tracks when I am in "Self Supply" mode and we are using the batteries overnight.Rade Radosevich-Slay
Tiverton, RIComment
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