Dual power option (internal battery and external power supply)

[Nisei]

Sorry, I called it pin 3 but I mean the pin most to the left labeled 3. Like you said, it would be considered the + of the battery. So what I'd like to know if it is perhaps connected to the B+ terminal on the board.

[vidalcris]

What if the cell 3 balancing lead terminal is directly connected to B+ on the DNA200 board?

Just connect the two red wire to your switch (you can also cut the little red wire, its the same result) :
 
btw the switch is open when you connect the external DC, but you already know that

[turbocad6]

yes, pin labeled# 3 on the balancing plug is connected to battery + of the board. evolve labels the balance plug as gnd 1 2 3 instead of 1 2 3 4 but the last one is equal to battery + 

[turbocad6]

vidalchris, that schematic will cause unbalanced errors in the board to display if you try to fire it like that

[vidalcris]

Oh ok you are right .. the chipset will maybe think that there is a problem :-/

[Nisei]

turbocad6 said:

yes, pin labeled# 3 on the balancing plug is connected to battery + of the board. evolve labels the balance plug as gnd 1 2 3 instead of 1 2 3 4 but the last one is equal to battery + 

Thanks. So you've measured it with a multimeter? (sorry, I want to make sure)
That would mean the balancing wire from the battery connected to the pin labeled #3 is actually redundant because the connection is already hard wired on the board.

[vidalcris]

Even if this is not connected on the chipset, this is connected inside the battery :

And i think Turbocad6 is right, the chipset will verify if the lipo is well balanced :-/

 

[Nisei]

vidalcris said:

Even if this is not connected on the chipset, this is connected inside the battery :

I know how it's connected inside the battery but that doesn't matter since the + side of the battery gets disconnected when you insert a plug into the DC connector I've drawn in my schematic.
The only important thing I need to know is if the balancing lead for cell #3 is connected to the B+ connector on the DNA200 somehow.
If not, my setup would work and the DNA can be left at the "Battery" setting even when you're using external DC since it still measures the balancing of the cells through the balancing leads.

[vidalcris]

If turbocad say that this is connected on the board, i think its connected
And anyway the chipset will verify if the voltage of cell1+cell2+cell3 = voltage between B- and B+.
That explain why there is a setting for external DC.
Else this setting is useless...

[Nisei]

vidalcris said:

That explain why there is a setting for external DC.
Else this setting is useless...

Well, not really useless. I mean, you wouldn't want the charge circuit to be active when it's connected to a power supply

[vidalcris]

Well, not really useless. I mean, you wouldn't want the charge circuit to be active when it's connected to a power supply 

True 

[BJ43]

@Laguz75: The stabilizer you posted is 24v to 12 volt with an input voltage of 18 to 30v, you would need a second battery. The one I posted had an input of 8 to 40v. I ordered one of the 24v for my boat that has a 24v system. Thanks.

[Guest]

BJ43 said:

@Laguz75: The stabilizer you posted is 24v to 12 volt with an input voltage of 18 to 30v, you would need a second battery. The one I posted had an input of 8 to 40v. I ordered one of the 24v for my boat that has a 24v system. Thanks.

yeah I reread the specs and forgot to edit it

[Jeekyfied]

Hi has anyone figured out how to bypass this issue? I'm planning a dna200 mod in a 1550P case and would like to somehow try and fit a 12V jack into the case. 

[Givesuhe11]

I made my box the same way.. and I've found that you can set it to LiPo battery and use external power supply (Directly to one of my wheelchair batteries) if you make a jumper/patch cable with an xt(30 or 60 depending what's on your battery), connector on one end and a balance plug on the other and three 10k resistors in series in between and wire to the balance plug this way:

You can then leave it in Lithium Polymer mode and vape on external PS... when you unplug the patch cable and plug in the battery just make sure you have unplugged the external


 

This is my passthru with the patch cable on:

 

there's the three 10k resistors in series in the black square wrap, I wrapped double sides foam tape around then black electricians tape over that just to make it sturdy when I up plug it for the battery... It works great this way, I've been using it like this for several weeks now... Note: if it ever starts saying "Check Battery" while on external, just unplug from ext ps, wait about 30 seconds and plug back in and it chugs on... Note 2: Use very high quality resistors, or the batt levels will fluctuate and it won't read correctly... I got this from an admin