Most reacted posts

Just as an FYI, I've uploaded an updated version of the ElectroDacus Beginner's Guide, Version 0.6 New in Version 0.6: Clarified and fixed some errors in the descriptions of advanced parameters, Added a table of contents, Added a section on mobile considerations, Added a dedicated section on...

Hi all, I've been designing a mobile solar system with ElectroDacus for a van build, and working my way up the learning curve. Since investing the time to figure it all out, I thought I would write up what I've learned into a Beginner's Guide to ElectroDacus to save others some of the trouble...

I've posted the latest version of the Beginner's Guide to ElectroDacus in this forum's Resources section: https://diysolarforum.com/resources/beginners-guide-to-electrodacus.174/ @Will Prowse you might like to look it over if you're working on a new ElectroDacus review video. Any additions...

Definitely. They're expensive but this is one place where you don't want to save money. Also highly recommended to read FilterGuy's excellent 4-part series on grounding, especially the mobile systems part: https://diysolarforum.com/resources/grounding-made-simpler-part-4-mobile-systems.159/

No, the "wall" provides equal and opposite force to the springs, so you don't gain anything by having springs on both ends. There's an old physics problem where you have two people pulling on both ends of a rope, versus tying one end of the rope to a wall and having both people pull on the...

@cinergi is that per cell? Do you have a total movement for your whole battery? I've been running the numbers for my 8S Lishen pack - from what I can see, I'll need much bigger springs than most people have been using, if I want to maintain a reasonable pressure variation. But 0.2mm movement...

This is exactly what I have on a van, with two 315W 60-cell panels and a 6kW battery. It works beautifully. I also added backups with alternator charging and shore power hookup, but rarely need them. If you only go with one panel, I think you may regret your power limitations, I would highly...

That would be a nice amount of power, I was only able to fit 2x 300W panels on my van roof but that has been plenty so far. I'm working on an update to the guide and I'll include details of my design in that, most of it is already covered in the current version anyway. ☺️

There's a guy, Ross Freeman, on the Electrodacus forum, who built a circuit to control this type of inverter - it converts an on/off input to a press/release type output. Only turns the inverter off at low battery, needs to be manually turned back on...

Good to hear that the cells stay flat. I'm also building for a mobile application, so those are good points about preventing abrasion and electrical contact. I'll look into adding something, but I won't worry about it having much resilience. Now on to spring force calculations!

@Horsefly you're right, I made a mistake in the schematic, the battery polarities should have been in the same orientation. I was trying to redraw it when I realized why it wouldn't work - the parallel load shorts out the batteries! @Steve_S are you saying that building a 24V battery with two...

I'm not familiar with the Cerbo GX, sorry - but I would think you should be able to!

@Steve_S OK thanks, that's good to know. I wanted to use the JBD BMS for its low-temperature cutoff - being in Canada - but it seems like that wouldn't let me to run more than a 2000W inverter with 8 cells.

It uses the ISL94203 monitor chip - is that passive? I think I'll just take the term out as it's not actually relevant. :)

The DSSR20s can only handle 20A each, so they wouldn't be much use for loads - not sure if they would actually work for that purpose or not. Most people use a Victron Battery Protect, set to Li-ion mode - they're pretty reasonable in price, and you can get them in multiple current ratings.

The only benefit would be if for some reason you needed the pack to be able to expand in both directions.

Here ya go!

Turns out JBD does have a 24V 8s BMS with low-temperature cutoff. I'm thinking I'll go with that and just use a 24V-12V DC-DC converter for any 12V loads. Kinda like what everyone said to do in the first place. ?

It would be great to have some pictures - are you volunteering? ? I'm about to put out a new version with a number of additions and corrections, so any contributions or collaborations are very welcome!

If you want to do both with ElectroDacus, you can. Set a Battery Protect to disconnect your DC loads at low charge, and set a remote battery switch to disconnect on fault condition. But that may be overkill -- if you just turn off your loads, that protects your battery from excessive...

You're right, Type 1 & 2 go by cell voltage, which is the correct way to manage charging & discharging. The SOC settings in the EXTIO page only apply to Type 3 & 4, which should only be used for alarms or secondary functions, not battery protection. If you want to charge to a lesser SOC after...

Did you program the Aux 1 & 2 on the Multiplus? See this resource: https://diysolarforum.com/resources/victron-two-signal-bms-assistant-for-multiplus-and-quatro-inverter-chargers.61/

Great, would you like to share pictures of your builds (and/or circuit diagrams) for the guide? At least for now, I'm not including it - Dacian specifically recommends against using an SBMS that way. But if you (or anyone else) has experience with setting it up that way and it works well, I'm...

Looks good with a quick review. Will you have a Class-T fuse between your load shunt and main disconnect? You may want to give yourself more space in your positive busbar, you're likely to add more draws over time. Also I'd suggest upping your Battery Protect to the 100A one, it's not much...

I'm planning to compress my single-row 8s battery with springs, however my guess is that the expansion is not equal across a cell's width - surely it expands more in the middle than at the edges? So I'm considering adding a resilient material between each cell, in addition to the springs...

Good point, I have M8 Lishen on order so they do exist, but it's true that most people will have M6. I'll add that in. LB3 do you have a source for those boards? Also keep in mind that Dacian says not to combine the full-length sense wires with the power supply wires, which I believe are 1...

Here's a more updated version of the Beginner's Guide to ElectroDacus. Please use this one if you downloaded the last version — there were some errors that were corrected, as well as more detail and info added. I think I've incorporated all of the feedback I've received. Let me know if you...

I'm looking at building a LiFePO4 battery with 8 Lishen cells. I'm thinking of getting 2 JBD BMSs and building two 4s batteries then connecting them in series for a 24V system. I had looked at an 8s BMS but that would be current-limiting for my inverter draw. So it occurred to me that if I...