I just wish the BZ had three stage charge control. It'd be a GREAT low cost controller if it did. Hey BZ, you guys listening? I could help you guys out with a design, perhaps... :D
@sparktastic1 It will act like a real MPPT controller with a bigger and better inductor than this one, but given the lack of any current sensing or input potential sensing it most likely is a buck converter designed to operate the PV array at the common maximum maximum power potential for the system it is connected to
(i.e. Epv=17V if Ebat=12V, Epv=34V if Ebat=24V, etc.). My BZ Products MPPT250/MPPT250HV still stands.
For an MPPT to work you have to first convert the DC to AC using a high frequency oscillator. Usually they switch at around 50-100Khz. At that frequency, that pissy little inductor would look like a straight lump of wire. You are correct in that this cannot be a real MPPT controller. It does not have the required transformers/inductors.
@sparktastic1 With a proper inductor this will work as a MPPT controller. Granted, that is with a ferrite core 9 turn inductor (roughly 21uH), and the current gain is only around 1.4% at 2.2A. I have found a bigger still inductor in my stocks of random electrical stuff and will try that. These idiots must have faked their EE degrees (very common in the far east), as one of the cardinal rules of electronics design is that air core inductors are NOT for switchmode power conversion use.
hi, the relay you are talking about, it 's just an Ne555 , I know because I have opened one. Mine was also not working properly like a real mppt charger.
@nickskethisnikske My theory is that this thing was designed by stoners/crack addicts (air core power inductor; custom packaged 555 oscillator, potential regulator, diode and two MOSFETs in place of a single schottky rectifier; loads of unnecessary MOSFETs; using a more expensive potential regulator for the microcontroller than necessary; crap build quality).
F A K E! Sure looks like a fake to me! It's CRAPPY, yeah, it's CRAPPY!
I love how the only part in there that even vaguely looks proper is the mysterious black brick that says "Wellsee MPPT", potted inductor(?)
hyvahyva 3 weeks ago
@hyvahyva The mystery black thing contains a 555 oscillator being used as a MOSFET driver.
Really.
I am not kidding.
randacnam7321 2 weeks ago
@randacnam7321 That's hilariously bad!
I just wish the BZ had three stage charge control. It'd be a GREAT low cost controller if it did. Hey BZ, you guys listening? I could help you guys out with a design, perhaps... :D
hyvahyva 2 weeks ago
But will it blend?
hebay2 2 months ago
Damn, I got suckered......... Oh well, you live, you learn.
MrNightro 5 months ago
Anyway I'm glad I saw this video as I was actually thinking of trying one.
Not now.. This thing looks like a standard PWM charge controller. What a rip off!
sparktastic1 8 months ago
@sparktastic1 It will act like a real MPPT controller with a bigger and better inductor than this one, but given the lack of any current sensing or input potential sensing it most likely is a buck converter designed to operate the PV array at the common maximum maximum power potential for the system it is connected to
(i.e. Epv=17V if Ebat=12V, Epv=34V if Ebat=24V, etc.). My BZ Products MPPT250/MPPT250HV still stands.
randacnam7321 8 months ago
@randacnam7321 My BZ Products MPPT250/MPPT250HV recommendation still stands.
randacnam7321 7 months ago
Comment removed
sparktastic1 8 months ago
Ha what a joke!
For an MPPT to work you have to first convert the DC to AC using a high frequency oscillator. Usually they switch at around 50-100Khz. At that frequency, that pissy little inductor would look like a straight lump of wire. You are correct in that this cannot be a real MPPT controller. It does not have the required transformers/inductors.
sparktastic1 8 months ago
@sparktastic1 With a proper inductor this will work as a MPPT controller. Granted, that is with a ferrite core 9 turn inductor (roughly 21uH), and the current gain is only around 1.4% at 2.2A. I have found a bigger still inductor in my stocks of random electrical stuff and will try that. These idiots must have faked their EE degrees (very common in the far east), as one of the cardinal rules of electronics design is that air core inductors are NOT for switchmode power conversion use.
randacnam7321 8 months ago
hi, the relay you are talking about, it 's just an Ne555 , I know because I have opened one. Mine was also not working properly like a real mppt charger.
nickskethisnikske 8 months ago
@nickskethisnikske My theory is that this thing was designed by stoners/crack addicts (air core power inductor; custom packaged 555 oscillator, potential regulator, diode and two MOSFETs in place of a single schottky rectifier; loads of unnecessary MOSFETs; using a more expensive potential regulator for the microcontroller than necessary; crap build quality).
randacnam7321 8 months ago