E-ODIN - Diskussionsthread

[Miguello80]

Lade ich hingegen mit meinen Solarpanels auf der Garage (2x810W + 2 sekundär parallel geschaltete MPPT-Boost-Charger),

Hi Jeff, what boosters do you use and what do you mean by "paralel" ? Two strings, each with own booster, then wires from both boosters connected together to one + and one - and from there charging cable to Odin ?
I will build a classic 3f FV but it will have to wait, buying EV depleted my bank account but I already have field construction with 2 solar trackers for 9 panels around 450 W so I will buy panels and booster like this one - https://www.aliexpress.com/item/1005006435255704.html - because I need it to be able to take lot of V and well known MPPT7210 takes max 60 V. So I am interested in your build It makes more sense to charge directly with AC than DC-AC-DC.

Da die MPPT-Boost-Charger bei der "72V Li-Ion" Einstellung die Spannung bis zu 87,6V hochfahren würden (wenn da denn noch Strom gezogen würde), sieht man an der Kurve auch, dass das BMS im Akku die Spannung auf einen Wert von knapp über 84V begrenzt.

Is not it possible to change the settings manually to set the booster to charge only up to 84 V ?

[jeff-jordan]

Hello "Miguello80",

I use these BM-6072 and yes, the outputs of these boosters are connected in parallel, means red wire (+) connected to red wire (+) and black wire (-) to black wire (-).

The inputs of these MPPT-boost charge controllers are each connected to an own PV circuit (2 panels each, in parallel at my side but it should work in series too).
You can't connect both mppt controllers to the same PV circuit... they would drive each other grazy (even MPPT / PWM controllers interfere with each others).

Recently I discovered that you can manually adjust the max. output voltage, but it's very fiddly with the tiny buttons, the tiny LCD and the user unfriendly menu.
Finally I managed to set them to 84.5V each.

I've checked these MPT-7210A controllers as well. But the over all power output is way poorer than with the above linked BM-6072.

Both MPPT boost chargers (MPT-7210A and BM-6072) will work without a battery at the output... and they start up when the sun is rising with the previously stored settings.

I even bought this controller too (60A version), but it's still unused in its original packaging.
If you are interested, I'm sure we will find a deal .

It would require that I connect all 4 PV panels in series to connect them with the controller. Because it's not a boost type controller, so the input voltage always (even in a cloudy situation) needs to be higher than the output voltage.
But I don't know if this type of controller will work without any battery at the output (it might need power, even during the night, when you would like to retrieve data via RS485).

My first attempt to charge the E-Odin battery (or the 72V/20Ah batteries of my Futura Classico LI) was with these DC-DC boosters, but that was very problematic when a cloud moved between sun and panels -> finally it fried me the HY3912 MOSFETs at two of these circuits. These modules can't cope with an unsteady input power.

So I stick to the 2x BM-6072 solution, because it works and it is performant. But it requires 2 disjunctive input circuits.

[Miguello80]

I use these BM-6072
I've checked these MPT-7210A controllers as well. But the over all power output is way poorer than with the above linked BM-6072.

Thanks Jeff, it confirms me that setup with DC-DC boosters works as I imagine.
What I do not understand is why do you think that MPT-7210A has lower power output than your BM-6072 - sellers description says that both of them is max 600 W out, 12-50 V (BM) / 12-60 V (MPT) in, so basically same. Am I missing anything ?
By the way how does it works when your string is 800W and booster's power output is only 600 W ? I am not an electrician so I am not sure whether booster cuts off everything over 600 W like DC-AC changers do or do you rely on that maximum from panels is almost impossible so 600 W is enough ?

I even bought this controller too (60A version), but it's still unused in its original packaging. If you are interested, I'm sure we will find a deal

I am all in for a win-win deal It depends only on your price. I wanted (a little bit cheaper) 30A version as I will not charge the bike with higher amps (I have 40A onboard charger but I use it only on trips, at home I use factory 10A charger) but oversizing is reasonable and the price difference is only 18 or 20 euro so no problem. We can discuss it via e-mail (miguello at seznam.cz) so feel free to contact me. Have a nice day !

[jeff-jordan]

....
What I do not understand is why do you think that MPT-7210A has lower power output than your BM-6072 - sellers description says that both of them is max 600 W out, 12-50 V (BM) / 12-60 V (MPT) in, so basically same. Am I missing anything ?
....

I have both.

The specs are similar, but the performance isn't.

I simply checked it out during mediocre weather.
One PV circuit as input to the BM... the other to the MPT..., outputs in parallel with an Amp-meter at each.

As it was cloudy the BM-6072 delivered 3.5A charging current while the MPT-7210A only delivered a measly 1A.
As the weather got worse and it started to rain, the BM delivered about 1A but the MPT stopped charging at all.

The difference between both might be lower during bright sunshine, but I haven't tested it so far because weather wasn't either great or I was busy with other stuff.

I guess the two devices have different MPPT algorithms or strategies implemented.

It shouldn't be a problem that the panels are able to to provide more power (810W), the BM-6072 won't deliver more than it's 600W... the higher power simply won't be used.

Both boost charger models are protected, which means that they lower the output current when their MOSFETs get hot.

[Miguello80]

The specs are similar, but the performance isn't.

Ok, got it. I saw a lot of videos about 7210A + comparison with other boosters and 7210A seemed to be the best so that is why I ask. I remember a video about newer version of 7210A, allegedly they improved it. It does not mean that you have older version, BM just can be better.
For my setup up to 4 kW these boosters are not suitable as I want to use all panels for charging my bike, only in case I would make 3 strings with 3 panels each = 3 boosters for price of 1 more powerful changer.

[jeff-jordan]

The properties of the MPT-7210A looked really good, that's why I ordered two of them after already using the BM...
It's active display is better, the buttons are better and it has a build in fan (unfortunately not temperature controlled, you just have to set it's speed manually and it's always on then).
You can even store several settings (but setting #0 is always the chosen one when the sun rises up... so it doesn't really delivers a benefit for me), and the setup menu is awkward too.

But in direct comparison the BM-6072 simply delivered better results for my setup:

[bob2.0]

"Surge protector"?

What is this part?

https://www.x-scooters.cz/de/teile-fuer ... rs02-.html

It seems like an optional extra to add?

[jeff-jordan]

I've recently seen this part too....
But I really don't know for what it's for.

I guess it's as useful as earth radiation shields.

[Miguello80]

"Surge protector"?

What is this part?

https://www.x-scooters.cz/de/teile-fuer ... rs02-.html

It seems like an optional extra to add?

It was needed to add to very first Odins with not so good batteries, you can find some videos about it.

Our bikes do not need it.

[bob2.0]

I want to install a top box.

I can see there are luggage options to buy but they are brutally expensive for what I want which is just the top box.

I don't like panniers, and don't like that side ironwork. I'd get one if it was cheap (anyone selling?) but not at those prices.

So I am thinking to simply bolt a box to the pillion hand grips, using pipe mounts.

My main concern is if I damage them. Are there replacements?

Do I have any other options?