First time, probably not. If they had to be disconnected (switched off) it could be a way to get buy in a pinch if you don't have a way to precharge. Thought came to mind and wanted to get others opinions.
RVs with DIY Lithium
- Thread starter Txglader
- Start date
The Victron does have a lithium setting and then you can customize those settings if you like. I was wondering about precharging the inverter capacitors so you don't have an arc when connecting batteries.
While the arc is a bit scary, it's the huge amp hit against your BMS that is the concern. At least to me.
The multiplus will charge - and at a high rate too, but you should absolutely configure it using a usb mk3 and a laptop. For initial setup, I connected mine to shore power only and configured it. Since I wasn't loading it at all, I just made up a wall plug for it and plugged it in.
That doesn't answer his question. He wants to know if the built-in 12v charger in the Multiplus would charge the capacitors. This would be a slick way of avoiding the huge amp surge against the BMS to charge the capacitors.
I did the same thing when I first configured mine.
Lt.Dan
Solar Wizard
That would be very interesting. I recently purchased the MPP LV6548 and was wondering the same thing, if I could precharge while hooking up to AC or if I had to precharge the DC side with resistor (or some other fashion).
My quattro charges its capacitors if I turn them on with AC connected and no battery. The lights in the house severely blinked! (2 5k quattro's at the same time - a lot of capacitance)
The multiplus 12/3000 also pre-charges capacitors from shore power. I can't remember if you just need to plug it in or if you have to turn it on as well, but you can definitely avoid the battery pre-charge issue if you have AC power. You might still want to have a pre-charge circuit if you anticipate having to disconnect/connect DC power in the absence of shore power, but I wouldn't say it's mandatory.
This is interesting. If TxGlader is correct, while normally the battery bank would be connected to the I/C if you were installing a new I/C or reinstalling one that had been serviced, If you ran the charger first before connecting to the batteries would that avoid the need to pre-charge with a capacitor?
Headed to the hardware store this evening to pickup supplies to modify the step.
I have the steps taken apart and rebuilding so I can fit the batteries under them. Relocating the MP 3000 to the right. It should have better air flow here. I may put in a devider to seperate it somewhat from the water system.
Attachments
That's an interesting use of space with the stair idea. I've also seen the multiplus mounted sideways for better air flow. (in the same area)
While you're under there, mouse proof the pass through where your black pipe goes out.
I found droppings in my kitchen island (where all my silverware is of course).
I got to looking under my trash can the other day and there's a friggin 6 inch hole with the sink drain going through it. Together with the pass through for the water supply lines it's like a mouse highway down there.
While you're under there, mouse proof the pass through where your black pipe goes out.
I found droppings in my kitchen island (where all my silverware is of course).
I got to looking under my trash can the other day and there's a friggin 6 inch hole with the sink drain going through it. Together with the pass through for the water supply lines it's like a mouse highway down there.
Great idea. Thank you.
I finished with the step mod.
Plywood to mount bus bars, switches, shunt and future MPPT controllers to in place.
Test fit of battery box is good.
Cables will come out of the battery box and connect to the bus bars mounted above it.
Plywood to mount bus bars, switches, shunt and future MPPT controllers to in place.
Test fit of battery box is good.
Cables will come out of the battery box and connect to the bus bars mounted above it.
Attachments
TexasFan
New Member
- Joined
- Mar 4, 2021
- Messages
- 48
Great install!
Thank you. Still have a lot to do.
