bexamous
Active Member
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- USA
Oops hit save too quick, huh.
I've seen these LED drivers before and initally got these three:
https://www.amazon.com/dp/B00FRBO4ZY -- Got the 54v (~49-58v adjustable) 3.45amp (~1.7-3.45a adjustable) Meanwell.
https://www.amazon.com/dp/B01N7KAQIL -- Power cord.
https://www.amazon.com/dp/B07YF393ZH -- Piece of garbage power meter.
That power meter is a piece of junk. Voltage is not perfect but 'fine', amps is ~15% off when its like 3.0 vs 3.4.. but it'll also start reading 0.0amps when ~0.5amps is flowing. The ending aH/wH reported is totally off, >80% off. Not sure how voltage and amps can not that bad but then aH/wH ends ends up very off. Oh and it also runs very warm, like the plastic case is very warm. The board is closer to hot, I forget temps.. IR gun sorta picks up board's temp through vent holes. One good thing, meter is easy to read. Big enough and backlit.
I replaced it with this power meter:
https://www.adafruit.com/product/3624 -- Nice power meter.
The screen is tiny is the only downside. Voltage matches my multimeter, amps matches a clamp meter I have. The thing draws no power, it makes no heat at all (at least with 3.45 amps going through it). I have now charged a couple packs and as far as I can tell the aH and wH reported make sense... I don't really have a good way to verify them though.
Eg ride today 30.17 miles, 3094 feet elevation. All I really know 48v17.5ah Samsung 35E pack's ending voltage was 47.0v, ~3.615v/cell. Used charger and power meter reports 10.54ah and 544.88wh. Cross referencing some stuff that seems pretty reasonable.. least close enough to me.
Anyways I've seen these LED drivers used before, but really just posting to show the power meter off adafruit as a better buy than the one off Amazon I've seen used a lot.
Before with junky power meter:
And this is just after when I had two power meters inline, the new one draws trivial power. You can see how volts is pretty close, amps is bit off, but then aH is way off.
I've seen these LED drivers before and initally got these three:
https://www.amazon.com/dp/B00FRBO4ZY -- Got the 54v (~49-58v adjustable) 3.45amp (~1.7-3.45a adjustable) Meanwell.
https://www.amazon.com/dp/B01N7KAQIL -- Power cord.
https://www.amazon.com/dp/B07YF393ZH -- Piece of garbage power meter.
That power meter is a piece of junk. Voltage is not perfect but 'fine', amps is ~15% off when its like 3.0 vs 3.4.. but it'll also start reading 0.0amps when ~0.5amps is flowing. The ending aH/wH reported is totally off, >80% off. Not sure how voltage and amps can not that bad but then aH/wH ends ends up very off. Oh and it also runs very warm, like the plastic case is very warm. The board is closer to hot, I forget temps.. IR gun sorta picks up board's temp through vent holes. One good thing, meter is easy to read. Big enough and backlit.
I replaced it with this power meter:
https://www.adafruit.com/product/3624 -- Nice power meter.
The screen is tiny is the only downside. Voltage matches my multimeter, amps matches a clamp meter I have. The thing draws no power, it makes no heat at all (at least with 3.45 amps going through it). I have now charged a couple packs and as far as I can tell the aH and wH reported make sense... I don't really have a good way to verify them though.
Eg ride today 30.17 miles, 3094 feet elevation. All I really know 48v17.5ah Samsung 35E pack's ending voltage was 47.0v, ~3.615v/cell. Used charger and power meter reports 10.54ah and 544.88wh. Cross referencing some stuff that seems pretty reasonable.. least close enough to me.
Anyways I've seen these LED drivers used before, but really just posting to show the power meter off adafruit as a better buy than the one off Amazon I've seen used a lot.
Before with junky power meter:
And this is just after when I had two power meters inline, the new one draws trivial power. You can see how volts is pretty close, amps is bit off, but then aH is way off.
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