acolunga07
New Member
- Joined
- Jul 24, 2022
- Messages
- 40
I’ve gotten almost everything I need for my 4P4S build using EVE304 cells. I haven’t decided between which configuration to put them in. FilterGuy’s post in beginners resources is very helpful. I will likely go with option A or C in the “12V 4P4S Fortune Cell Layouts” (on p17). I am limited in one direction by ~14” (EVE304s are 174 x 72 x 205 mm). So, option C (which I prefer) puts two side by side (13.7” wide) and hopefully* enough room for all thread used for compression (+ ~.375” x 3). This of course is over the rough ~14” I measured but I’m hoping there is some extra margin somewhere I missed. This configuration allows me to use only 4 spread plates (two large enough to cover two cells) and 3 sets of compression mechanism (one on each end and one in the middle). If this doesn’t fit, I’ll be forced to go with configuration A and have to get twice as many spreader plates/compression mechanism. Thoughts/opinions on either of these options?
Either way, I’m still stuck with needing to get some number of “Heavy Duty” bussbars which leads me to several questions:
1) is the color scheme for this configuration (p17) incorrect? All the other ones use purple for heavy duty and green for factory buss bars. This one has green for “oversized” (vs heavy duty?) and blue for factory. The diagram uses purple/green (no blue).
2) How thick are heavy duty buss bars. I know it’s based on ampacity which is based off the conductivity of the material but does someone have a cheat sheet somewhere with recommended thicknesses or areas based on current? I am still trying to decide how much to cap/fuse protect my system for (somewhere between 300-400A). I am powering a Victron MP II 3kW invertor and misc dc loads in my travel trailer and considering cost/availability of certain components. Speaking of which…
3) What are y’all’s thoughts on flexible buss bars? How much expansion/contraction might I expect from my batteries during nominal use (while under 6-12 psi compression)? I’ve heard numbers ranging around .5mm but have no idea if that’s accurate. Assuming it is, wouldn’t that require flexible buss bars? I was thinking of using these. There are options on AliExpress that have current ratings as well. Thoughts opinions?
4) it seems the most popular disconnect is the Blue Seas 6000m but it is only rated for 300A. What would y’all recommend for 350 or 400A?
Either way, I’m still stuck with needing to get some number of “Heavy Duty” bussbars which leads me to several questions:
1) is the color scheme for this configuration (p17) incorrect? All the other ones use purple for heavy duty and green for factory buss bars. This one has green for “oversized” (vs heavy duty?) and blue for factory. The diagram uses purple/green (no blue).
2) How thick are heavy duty buss bars. I know it’s based on ampacity which is based off the conductivity of the material but does someone have a cheat sheet somewhere with recommended thicknesses or areas based on current? I am still trying to decide how much to cap/fuse protect my system for (somewhere between 300-400A). I am powering a Victron MP II 3kW invertor and misc dc loads in my travel trailer and considering cost/availability of certain components. Speaking of which…
3) What are y’all’s thoughts on flexible buss bars? How much expansion/contraction might I expect from my batteries during nominal use (while under 6-12 psi compression)? I’ve heard numbers ranging around .5mm but have no idea if that’s accurate. Assuming it is, wouldn’t that require flexible buss bars? I was thinking of using these. There are options on AliExpress that have current ratings as well. Thoughts opinions?
4) it seems the most popular disconnect is the Blue Seas 6000m but it is only rated for 300A. What would y’all recommend for 350 or 400A?