All right guys, quick video tonight i want to talk to you about free charge, pre-charging the caps on your pretty much anything i mean anything that has a bank of capacitors, like your inverters or all kinds of equipment. Has that right? So when you plug in stuff that has capacitors there's a spark now, sometimes if it's like a little device, it's a little spark. But when you're talking about like a huge system like this, this is 4 000 watts of uh inverters. I'm gon na put four kilowatt hours worth of battery right with big, connectors and stuff.
That spark right here. If i just connect that in here, this is gon na be a huge spark and what happens is that you could damage your connectors here, because that spark is gon na, be so big that it might melt the contacts and then they're not gon na work as Good, so you do that a few times and then you ruin your connector. So what you have to do is you have to pre-charge your caps on your thing. How do you do that? Let me show you all right here we go.
These four inverters are connected in parallel right and then they terminate into this plug here. This other plug here is the one that's coming off of the battery this battery. Here, it's at 41 volts right this. This all these batteries here can put out five amps each.
So they add up, there's like uh 24 25 of these in here or something so you do the math there's quite a bit of power that can come in here and then they're fused into these big giant fuses. Each one is 80 amps. So, theoretically, this could do about 160 amps for a few seconds right before these uh uh fuses will go right. So there's a lot of power here that are capable right.
So so here's how we're gon na pre-charge the caps here i have connected on this side. A power supply this power supply is set to the same voltage as those batteries right there, and so, as you will see here on the little meter on the power supply in a few seconds, the caps will get there. So what you want to do is you want to set your power supply to the right voltage and to the right uh current. So i have it set to zero right now, the current right and then you want to connect it and then only once everything is connected.
Then you could apply power to the power supply, so we're gon na do that right now. We're gon na do the thing here: okay, so there we go right now it's at zero everything's at zero, because i turn this off right. So now, what i'm gon na do is i'm gon na start applying current and there we go. It's like one amp and it's going and boom just like that in a few seconds.
The caps over there now are at 41.7 volts 41.7. So now those caps right here are charged with the electricity right and so now, when you connect that plug to that plug. There's not going to be a huge differential, and that means that then there's not going to be a huge spark, so let's try it and see and do it in camera. I always flinch when i do these connections because i don't like sparks right.I don't like sparks um period, but i don't like sparks when they're, not okay, positive, to positive negative to negative okay! Oh now, are you telling me these are different. These are different. Okay, i'm gon na have to change the plugs here, so these are different brands. Uh, that's the thing we keep getting from different suppliers.
They keep sending them different and there's slight differences on these okay. Let me change that and then we'll come back all right, we're back now. Now these two connectors are the same. Should work - oh, my god, okay yeah, so it was nothing, no spark! Why? Because both connectors have the same voltage right so now what you can do is you can disconnect this in here uh, because that served this purpose.
So now you can turn it off, and now we continue with our test. So that's just one way that you can do pre-charge right. You use a variable, voltage power supply and then you charge the caps and then you connect your battery right slowly charge your caps! Another way to do it is to connect the actual battery right, but not connected directly. You use the resistor and there are a couple of other ways, other components that you can use to do that right, but for right now this is the only one i can show you so there you go uh if you were wondering how to do this, how To eliminate those sparks how to not destroy your high current connectors pre-charge, your caps, that's what you have to do all right! Thank you for watching this video, we'll see you guys in the next one bye,.