can this controller do its job correctly?

[racmaster]

i found a company selling wind turbine combo charger controller with divert load, where also abundant power from solars can be used for example for heating...

https://windandsolar.com/digital-all-in-one-charge-controller-led-meter-3-phase-dc/

as i went through its cycle it works like this(BMO)
1: AC3 phase power comes from turbine to manual switch and then to rectifier, making DC
2: positive cable from rectifier goes to relay switch AND to battery positive pole too
3: negative from rectifier goes to negative pole of dump load AND to the battery negative pole in the same time
4: voltage sensor monitors if the battery is fully charged and then triggers the relay, which moves all the power to the dump load, until battery voltage goes down to set value, then the dump load is disconnected and power goes back to battery and again and again. lets suppose this is setup correctly and it only diverts abundant power from turbine after battery is fully charged...

for purpose of this question, lets forget the dump load part of circuit

question to this scenario is: can a battery be charged directly from rectifier? without any dc-dc stepup/down converter?

isnt the voltage from rectifier jumping up and down based on wind speed turning the turbine?

maybe i missed something, but im afraid, that there can be situation, when for example standard 12v battery will be charged with voltage higher then 14.4v coming directly from rectifier without dc/dc converter and also opposite situation may happen, that there will be not high enough voltage coming from rectifier, if wind is slow, lets say 7V and battery will not be charged during these periods...

[Mike90250]

Well, when the wind is slow, there isn't any real power being harvested. you could up convert the 7v to 14v but you might only have 50mA not worth it.

it it's a 12V battery and a 15V alternator, after the battery is charged, the Dump Load reduces the power to the battery, no additional regulator needed. Of course it's a
crude regulation, say the load is 500w, and the battery is only 90w overcharged, the dump load will be cycling on and off quite a bit to maintain an "average" charge.

[racmaster]

what i suppose is, that there could happen, that from rectifier is going for example 20v/1a. which is too high if battery is allready fully charged, but if it is lets say on 11v, is it problem, when rectifier output will be 20v/1a?

[Mike90250]

The battery will limit the rectifier voltage to the battery voltage, but you need to rely on the Dump Load to regulate the voltage after 13.5VDC. Without a dump load, the alternator can overcharge the battery and damage it.

What is the wattage of the wind turbine ? The controller only has a 600w dump load, I'd not use it with larger than a 400w turbine.

[racmaster]

yes, thats what i needed to have confirmed. that battery will limit potentially any DC voltage to its nominal voltage until fully charged. than it will runaway...

is there any formula, that could specify how much higher voltage will be battery able to limit to its voltage? for example output of the rectifier 100v - battery 12v...? i suppose it will be something with current and resistance... but dont know how.

[Mike90250]

When the battery is low, it can absorb a lot of amps, till it starts to approach full. At about 80% full, continued over-voltage will start to increase the
battery voltage till something dies: Battery overheats and actually boils and melts the case, wires overheat, a steam explosion of battery acid..... chose the worse for your situation !