I’d like to find out what the maximum load output current is for this MPPT. I was unable to find the specification on the TDS.
The unit has been in service for a couple weeks and the load current tops out at 8.3A @ 26.5vdc.
I have the battery charge set to the maximum, 20A. I’ve tried setting the load output to “Battery Life” and “on” and both have the same result.
P/N: SCC110020160R – S/N: HQ2546RR3HU
According to the datasheet its 20A at 24V.
What do you mean with “tops out at 8.3A @ 26.5vdc”?
What do you have connected to the load output?
I see that’s the battery charge spec.
In the manual I found it has 20A for the Load Output, but it doesn’t list a voltage - I can assume it’s 24v.
The PV output was 49v and 315W. Perhaps I’m seeing the down conversion from 49v to 26.5v.
I’m using the LO to recharge a power station battery. The PS input can accept 60v @20A.
It’s a 12/24/48 mppt, the datasheet lists the max cont load for each - 20A/20A/1A
What page or section can that be found?
Look for Continuous load current
O-k, thanks for the conformation.
In terms of the limited current, I have two 25.6v (100Ah) batteries in parallel attached to the MPPT. So I’m still wondering why the peak output current has been 8.3A. With the batteries fully charged the LO current should be 20A. I’ve noticed that the PV input divides power depending on the state of the battery charge and LO demand.
If the LO comes from the batteries, why isn’t the current higher? As mentioned, I’ve tried both “on” and “battery saver” modes.
edit: series → parallel
That would mean you’re charging a 48vNom battery bank, in which case you’d only expect to see 1A out of the load-out.
You most likely mean you have two 25.6v batteries in parallel.
In either case, you’re using the solar controller’s load-out to supply power to a DC-DC charger inside a battery pack; that’s not the intended use of the load-out, so there’s a very good chance that the electronics inside the charger in your battery pack are interfering in one way or another with the electronics inside the solar controller.
Since the 3rd-party battery pack clearly has some manner of DC-DC charger inside (else none of this would work at all), why not just connect it to your 24vNom batteries directly instead of fiddling about with the solar controller?
Yep, I meant parallel.
As mentioned earlier in the thread, the LO is going to a power station, (Apex 300). I didn’t think the LO was intended for any specific use.
Yes I’ve considered wiring the batteries directly to the PS. However I wanted to understand how the MPPT works before making any changes.
Yes, which is a DC-DC charger inside a battery pack, designed to take a DC input and either boost or buck that DC input as necessary to charge the battery pack. So you have the buck-boost charger inside the battery pack, and its own electronics, trying to pull power through the solar charge controller and its electronics, and running into fairly predictably odd behavior.
You’ll definitely have better luck, and more consistent results, removing the excess complexity and connecting directly to your batteries.