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MPT-7210A limiting current? Issue charging 54.6v pack
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- čas přidán 27. 09. 2020
- Unsure why this is happening - I've got a 150 watt power supply and a battery not at full voltage (54.6v) and the boost controller juetncaps out at 1.75amps or about 88.8 watts.
The issues about the current limiting can be easily explained. I noticed the same limitations and did some in dept investigations to find the root cause. Here is what I found:
This controller cannot accept more than about 6.5A (my observation) as input current. That's how it must have been designed. So the maximum available input power in Watt is: Vin x 6.5A. If more charging power (charging Voltage times charging Current) is needed, it can only be archieved by increasing the input voltage Vin when the input current is at its max. Normally a boost converter would increase the input current to keep track of the requested output power but when it reaches 6.5A it's over and out with this device. It's a undocumented limitation. For me it means that I can't charge my 42V ebike battery with more than about 1.7A with a 12V battery as power source.
There is a 'workaround' however (don't laugh): connect a decent boost converter on the input of the MPT-7210A to increase the input voltage ... I told you: dont laugh! :-D
My panel input voltage was 40v, only charging at 3 or 4 amps max. So less than your 6.5A
@@AndyMcBlane 6.5A is the maximum input current of the device, not the charge current
I have a 48v/20 power supply and MPT-7210....
I have 50v input set and 86v output to charge 21s 88.2v max battery
I only get 2 amps max output when going from 50v to 86v. Is this normal
I found that there isn't quite an absolute input current limit, but rather an output limit based on the difference between input and output voltage. Just like you say, increasing your input voltage to be closer to the output allows for more output current.
I have the same issue.
18V -> 54.6V 140W limitation.
There was 70W originally, but I put the bridge on the wire resistance in the circuit. Thus I was able to double up the current and power.
"I put the bridge on the wire resistance" Could you explain that? The unit is kind of pointess in my use (a 180W 15.5V MPP solar panel is liited to about 75W) but doubling the current would help. Thanks.
Had the same problem when I used it with a 24V power supply. Only 2A at 54.6v. Although 24V at 10A would easily be 240W. Maybe it works better with a Solar Panel and when hooking it up to Power supply possibly with a not 100% clean DC the MPPT' logic does something strange ?
Used a 400W step up converter instead, charges my Battery with up to 14A. (13S/8P Pack, so no problem for the battery, although I usually only use 6A to safe Battery life)
I have the same issue, you ever figure it out? 19.5v to 58.8v is capped at 1.4amps, or about 80w. I'm using a 200w dc adapter 😂.
check my reaction in the main section
Indeed, this is a finicky unit. I did some experiments to find that the amount of output current you can get depends entirely on the voltage difference between the input and output -- the closer they are, the more current you can charge with. In your case of going from 20V to 50V, I would only expect a max charging current around 1.75A -- exactly what you are seeing.
If you put two of those laptop chargers in series you can supply ~40V and get 3-5A out depending on your state of charge.
I just made a blog post to answer questions exactly like this:
mschausprojects.blogspot.com/2022/05/how-to-get-max-power-from-mpt-7210a-boost-charge-controller.html
I'm trying to help debug a solar to ebike charger for a science fair project. A 54.6V battery charge voltage (but 50.xV at first of course) charged by 15.5V Vmpp 180W panel. Hence, a 35V or so V diff. In your plot, that puts me at about 1.5A which is exactly what I am seeing. I might investigate the Ecoworthy 12A boost controler that admits that at 12V they can only achieve 216w. That's OK for my panel and I can always scale it in series rather than parallel.
I congratulate you on the only comment that is not nonsense.
I have the same 1,5A limitation. Using a 330w 35v panel to charge a 72v battery, it never went higher than 1 5A.
Any answer other that the unit is limited in its capacity ?
check my explanation in the main section
How many Watts is your input? If you've only got about 100w coming in from a single panel then 88w is actually decent from one of these units (at 85 percent efficiency)
Did you figure this out? I have same problem and same basic setup but with a 180W 19.6V power supply. Also tried with 12V supply and got the same result. It is limited to 10 amp input and output, so at 12 V it can only charge at 120 watts. I get the have 80 watt output on either supply
I’m waiting to discharge the batteries and have a desktop psu 420 watt 12v rail
I have a 48v/20 amp power supply and MPT-7210....
I have 50v input set and 86v output to charge 21s 88.2v max battery
I only get 2 amps max output when going from 50v to 86v. Is this normal
You ever figure it out? I tried to check your "main section" I dont know what you mean by that.
i think its the voltage from the "charger" the mppt works to the lvl of 19v > more power need so lower drop the voltage
check my reaction in the main section
Hey - same issue here. Did you figure it out?
check my reaction in the main section
unfortunatly the input and output caps arent good quality and should be changed for bit larger too,and using 2 12 atx computer psus in series gives you 24 volt up to 50 amp draw powersupply, and can push higher currents then i found using a much higher quality 24 volt mttp charge controller of 40 amps,with a seperate 40 amp dc to dc booster boardof ebay for 20 dollars i cazn charge 84 volts nat over 20 -30 amps now
mind you requires high end bms to handle those currents ,i use daly smart bms 20-21 s 72 volt 150dc amps charge and discharge constant
Dude, there's nothing beyond limited except by the fact that you are operating the contort improperly. It's a voltage boosting solar charge contort with dc dc charge function. It's not made to run off already converted ac to dc current. It will work but the wattage is not going to be indicative of charge performance in any way. Secondly, wattage has nothing to do with the charging function whatsoever. If you are giving it a lower voltage than what you are asking it to charge, it is going to charge at whatever voltage you set out to no matter what. If you have it set to charge a 54v battery at 56v or a 72v battery and 76v, it's going to charge to that voltage at up to 10amps. When the volts and amps are discharged wattage is achieved. Wattage means nothing as long as the volts and amps are being pushed. Plug in a 12v or 24v battery or a solar panel and watch what happens. Charging a 54v battery at 10amps is probably about the top end of what the battery can reasonably tolerate so you're getting maximum charging
I'm wondering in which way DC from a Power supply is better or worse then DC from Solar or Battery. Either it is DC or not. The Electrons don't wear Id cards. Except if the DC from a Power Supply is not clean and this Solar Charge controller gets confused by some frequencies that are still embedded in the DC. Maybe for the Power supply->Charge Controller->Battery application the MPPT Logic has adverse effects.
This is a shitty MPPT... simply... i got 2 for 13€ each .. and still .. i feel scamed .. :D
I would agree . I have 2 of these, the second one was to establish if the first one was working... The second one is even worse with the display going off with no option. They are a waste of money.