EB70 and solar charging with JASolar panel

Product Discussion BLUETTI EB Series
1

Hello
I have a Bluetti EB-70 and am very satisfied with it. I also have a PV module left from JASolar (JAM60S10-345, Vmp 34.99V, Imp 9.64A) that I would like to use to charge the EB-70. Since it can’t be connected directly, I plan to put a DC-DC converter in between. This would be for example a Victron Orion-TR 24/24-12 with 24,2 V output voltage. (nom output 24,2, range 20-30V, cont. output 12A).
Would this be possible, to connect the EB70 to the DC-DC converter with the solar charging cable? Or alternatively would it be possible, to charge from a dc-dc charger with car-charging adapter and the car charging cable the EB70?
a small sketch:

PV		        	DC-DC Charger			   EB70	
—----		    	——————————			       ———					
JAM60S10-345		Orion TR 24/24-12
Vmp 34,99V	—-----> input 16-35V
Imp 9,64A		     output 24,2V   —————>		solar charging cable

			        Orion TR 24/12-20
JAM60S10-345 ----->	input 16-35V
			          output 12,2 V  —————>    	car charging cable

greeting
p.

2

I don’t know the full specs of your DCDC but I don’t think it would work well unless the PV is getting max power. The EB70 is going to see a fixed 24V voltage source and the MPPT is going to try to sweep the current, ramping up to 8A. If there is enough PV u to the DCDC to support 24V 8A output, then everything is good. If there isn’t, I don’t know what will happen. Will DCDC output voltage drop as current increases? Also the DCDC isn’t an MPPT so it won’t operate the panel effectively.

I have a similar issue with 38V 340W panels, just cannot use them on EB series that only accepts panels up to 28V.

3

You can try the first idea, and the EB70 will pull only 8 A at 24 V, which is only 192 W.

4

Thank you! I think then I will try the first option. The main reason was, not to damage the eb70 with to much power. If there is only a slower charging, thats not so bad.
Stay safe!

5

Short update: after a talk with my dealer, now I have choosen a victron mppt smartsolar100/20 and load the eb70 with the solar/cigarette cable. He said, this is the most effectiv way and he wouldn’t recommend a dc-dc, so as snowstorm said. Additional one could add a second panel, also change the output of 12v/24v when there is enough sun. There would be several ways to test the configuration. Now its time to observe it…

6

old thread but I’m really interested if this worked or not?

I’m also trying to connect larger panels and an mppt to charge my EB70 . . .