bike4life
10 W
- Joined
- Apr 10, 2020
- Messages
- 82
i purchased a 1000W SMPS 120v AC --> 36V DC supply. This is for charging my ebike. I wired it up against the battery for charging and the following readings are done with a ac/dc clamp meter.
I am measuring 12 amps on the input and 27 amps on the output.
12 x 120 = 1440w.
36 x 27 = 1000w
roughly 70% efficient i guess. 1000/1440 = 70%
I am feeling the case and its cool too the touch, attached to the case i can see the screws which hold the mosfets / igbt which are heatsinked to the case and i can feel them and it feels like 10 watts, very low, yet i dont get why my readings say its losing 400 watts. I dont feel 400 watts of heat for sure. I dont think i am losing 400 watts from power factor as SMPS do not affect power factor.
comments????
This is for a special build where i need at least 95% efficiency. I feel like AC / DC current meters / clamp meters which i used are not accurate at all, and maybe i should go oldschool with a shunt.
I am measuring 12 amps on the input and 27 amps on the output.
12 x 120 = 1440w.
36 x 27 = 1000w
roughly 70% efficient i guess. 1000/1440 = 70%
I am feeling the case and its cool too the touch, attached to the case i can see the screws which hold the mosfets / igbt which are heatsinked to the case and i can feel them and it feels like 10 watts, very low, yet i dont get why my readings say its losing 400 watts. I dont feel 400 watts of heat for sure. I dont think i am losing 400 watts from power factor as SMPS do not affect power factor.
comments????
This is for a special build where i need at least 95% efficiency. I feel like AC / DC current meters / clamp meters which i used are not accurate at all, and maybe i should go oldschool with a shunt.