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diy solar

Luyuan battery case

Martijn said:
I was finally able to finish assembling mine. Here's some pics. Took me a while, things to do etc etc. Also, I had to swap around the cells because I mixed up main battery positive and negative.

And I wanted a t-class fuse inside the box, preferably before the breaker. After much consideration, I decided to put it on the front plate. Taped a few of the BMS temp-sensors to several spots/cables.

I noticed there's a bit of voltage drop between battery pos/neg compared to the box terminals, perhaps I should use some paste on the class-T connections as well. How much voltage drop do you lot deem acceptable?

Empty rows in the box.
View attachment 293059

Some cells!
View attachment 293060

First attempt, but having positive and minus mixed up :-(
View attachment 293061

This is better.
View attachment 293069

Class-T on front plate.
View attachment 293063

The front from the outside.
View attachment 293064

It fits.

View attachment 293066

Angle from the other side.
View attachment 293067
Click to expand...
What’s the second small gauge wire on the positive terminal?
 
SparkyJJO said:
I would simply make a single precharge at your inverter input. Why put one at every battery? Seems redundant, added unnecessary cost.
Unless I misread something.
Click to expand...
Yes, only need one. I prefer the light bulb over a resistor. And it looks cool.

Zwy

Post in thread 'Victron is Over-priced Eurotrash. Why would anybody buy Victron over an AiO?'

NC_hydro said:
I had good results using 48V forklift light bulb as my precharge resistor.
Click to expand...
It looks cool too when you press the button.

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Zwy said:
I prefer the light bulb over a resistor.
Click to expand...

Implementing the light bulb solution is so easy. I wanted a resistor solution but I couldn't figure out which resistor. People were posting which resistor to use for a 12 volt system but I couldn't find the right part for a 48 volt system.

It would be fairly easy to switch to a resistor. Maybe someday. The light bulb does provide good feedback for when the capacitors are full.
 
HRTKD said:
Implementing the light bulb solution is so easy. I wanted a resistor solution but I couldn't figure out which resistor. People were posting which resistor to use for a 12 volt system but I couldn't find the right part for a 48 volt system.

It would be fairly easy to switch to a resistor. Maybe someday. The light bulb does provide good feedback for when the capacitors are full.
Click to expand...
If one doesn't have a 48V bulb, a few 12V in series can be used or even an incandescent bulb normally used on 120V AC. The nice thing about using a bulb is even a person with very little knowledge about the system can understand pushing a button until the light goes out, then throwing the main switch.
 
I found a 24 volt bulb that I can use for my 8s portable system. Add a couple of wires with clips and a bulb holder and it lets me precharge my Multiplus. The bulb is only on for a moment or two so it doesn't take long.

I used this for my portable system in the past since there is only one battery and it is a non inverter model. Since my main system has multiple batteries, I don't bother since there is plenty of input and they utilize the JK inverter BMS which has precharge built in.
 
Last edited:
JJJJ said:
I found a 24 volt bulb that I can use for my 8s portable system. Add a couple of wires with clips and a bulb holder and it lets me precharge my Multiplus. The bulb is only on for a moment or two so it doesn't take long.

I used this for my portable system in the past since there is only one battery and it is a non inverter model. Since my main system has multiple batteries, I don't bother since there is plenty of input and they utilize the JK inverter BMS which has precharge built in.
Click to expand...
When a 20-40-60w 120v ac incandescent bulb are so cheap why wouldn’t you just chose something so easy to grab rather than a DC bulb?
 
740GLE said:
When a 20-40-60w 120v ac incandescent bulb are so cheap why wouldn’t you just chose something so easy to grab rather than a DC bulb?
Click to expand...
Valid point. As it turns out, didn't cost much and the jumpers have paid for themselves with other DIY projects. Other benefit is that I can run it directly off the battery if I want to add light to the solar area.
 
740GLE said:
When a 20-40-60w 120v ac incandescent bulb are so cheap why wouldn’t you just chose something so easy to grab rather than a DC bulb?
Click to expand...
Those bulbs will work as I mentioned but take up more room if a permanent install.

Plus the availability problem. Any incandescent around here is hoarded as I use bulbs as part of the load for battery testing.
 
42OhmsPA said:
Is that a 3D printed fuse holder?
Click to expand...
No, it's 3D printed cover though. I ordered T-class holders with 2 terminals, cables directly on fuse, as they are smaller, but they come without a cover. Have one cover printed in the camper as well, printed plastic threaded nuts to hold the cover in place as well.
 
Martijn said:
No, it's 3D printed cover though. I ordered T-class holders with 2 terminals, cables directly on fuse, as they are smaller, but they come without a cover. Have one cover printed in the camper as well, printed plastic threaded nuts to hold the cover in place as well.
Click to expand...
You have a link where you ordered them from?
 
Come with me on my journey

8s mb31 and 8s case ordered 4/4
Shipping notification from china today
Test reports from cells +320ah
Probably arrive in port 3 weeks, hopefully at my door mid June.

Nice group of pictures and cell reports provided on shipping notification.

IMG_7438.jpeg
 
ChrisFullPower said:
View attachment 295189

Looks like mine are on the way too! I had Amy customize mine with just the cutouts needed on the front for the comm board - I'll make my own holes for the power connectors.... as soon as I decide which ones I'm going to use
Click to expand...

Also, got a message from Amy late last week. Mine are being shipped out as well. So looking forward to seeing what I receive and how they work.

IMG_3172.jpeg
 
I take it we all paid DDP?

Any word on recent changes requiring additional payments?
 
Heard from Amy, ship is the Ever Macro, making one stop, then headed to LA, should be here May 17-20. In hoping package at my door 6/6.
 
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