Wellsee MPPT

[moorsb]

Does anyone have one of these? I am looking at the 60amp unit.

[nigtomdaw]

I will be extremely surprised if its a MPPT unit ! The closest it will get to being such is the labelling on the case IMHO.

[Cariboocoot]

Well, see I tried reading the info on their web site but the English was so bad it was incomprehensible.

Are they any good? We'll see.

(Apologies; I can not resist a good joke. Or a bad one. )

What would you expect for $133? A Morningstar 60 Amp MPPT is 4X the price.

The specs, such as they are, do not impress.

[niel]

coot,
i don't blame you as i was thinking of the same thing with the name. if i made and was marketing a controller, it certainly would not be a wellsee as in we will see. possible new offshoot could be a maybnot.
never heard of it before to comment, but if you get one then let us know what you think. i know, wellsee.

[moorsb]

I bought 2 of them and they look cheaply made. I only have one up and running today. I am not using the load output. It cuts off the load at 10.5volt. By then your battery is dead. It would be nice if you could adjust that. There is a Red LED that flashes as it charges. It turns off at night and flashes at different rates during the day. It turns solid red when the battery is being used.

How would I test the MPPT function?

[Cariboocoot]

There are no meters on it, so without getting a Trimetric or similar it's going to be a bit difficult to determine if it's doing any good - or anything at all.

Check the input and output Voltages with a DVM. If your nominal array Voltage is significantly higher than your system Voltage (24V array, 12V system) you should see that difference for starters. The trick is to check input Voltage @ input Amps vs output Voltage @ output Amps. If there is MPPT function the input would read higher Voltage at lower Amps and the output lower Voltage at higher Amps, both multiplying out to nearly (but not exactly) the same Watts.

But remember that maximum charging will only occur if the batteries actually need it; if they're near charged they won't draw much current anyway.

[moorsb]

I put a voltage meter on the panel terminal and it shows 18.5 volts
Battery term shows 13.5 volts

I have a 500a shunt on the negative side and a 0 - 500 a meter. I pulses negative every time the MPPT chargers light come on. The Red LED flashes at different rates, very slow when the load is small. I will be putting a tri metic on it.

It must be working as I hear the batteries churning.

[Cariboocoot]

I have a 500a shunt on the negative side and a 0 - 500 a meter. I pulses negative every time the MPPT chargers light come on. The Red LED flashes at different rates, very slow when the load is small.

This sounds suspiciously like the behaviour of a PWM controller, rather than an MPPT.

[moorsb]

I now have two of these in parallel. I have noticed that one seems to be charging and not the other. Do they need a diode on them to feed parallel?

[dwh]

I now have two of these in parallel.

From the same PV array?