Recent content by ericjanvanputten

Hi Peter, I did not. I replaced it with a Victron Multiplus as for me this was the plan all along, just not then :) I did speak with Mastervolt and they were willing to update the software which might have helped. Good luck! And if you find a solution, update me/us here.

hi all, I have a fun one with a Mastervolt Chargemaster 12/70-3 that I would like to serve a bunch of Lifepo4 batteries, but it seems its ignoring its programming. The 2 issues I seem to have: Ignores Bulk / Absorp setting and keeps going at full blast After AC being re-activated it doesn't...

I will try these settings :) But I think that the moment I set float to 13.4, the charger basically stops charging at 13.4v (I think I had a low float like this before and the charger basically hit that soon and stopped charging)

Hi all, I have 16x280ah EVEs (F280Ks) in 4 sets to go 12 volt. And for the next year or so I would like to continue using the Mastervolt 12/70-3 charger that I already have. I seem to have a lot of programming options with the Mastervolt and I would like to go very soft on the batteries, but...

Just wanted to share that I found this very helpful and confirming my experience on the slow amp charging when set to 3.65V max voltage, If only I had the balls to go to 4.40v to charge faster because this is slow as fudge!

thank you for that advice... I have to admit that earlier I didnt have the precharge, and now i would need this solidswitch :) so the idea is getting a bit more parts, complexity (elements that can fail) and cost (although that one is the easy one) than what I would like :) And based on @toms...

Well the idea is that the contactor is the emergency cutoff, and doesnt do that many cycles (if a cycle is open/close, the idea is that its almost always closed (letting current through)). But by the sound of it it continuous to feel that it adds more risk than that it is suppose to reduce :)

@jwelter99 - I will add the battery fuses, great input! The idea of the contactor is a last line of defense kinda thing, so if voltage drops or gets to high, it kills everything. Last defense to protect the batteries, something the JBD BMS's should do as well. So maybe it is overkill to do the...

Based on feedback from @Rocketman and additional input from another subpost in this forum, I have adjusted that: - added a Rec BMS pre-charge - the BMV-712 will with its relay talk to the pre-charge - the pre-charge will switch the contactor & do its pre-charge thingy Good or bad adjustment?

I got the advice to add a pre-charge (from rec bms) for my contactor last line of defense system (image below). Now I dont use the rec bms (but the jbd-sp040s020), can the rec bms pre-charge work as stand-alone? or potentially work by the relay of the BMV-712?

Sounds cheap and smart - good point!

Great, complete, answer and feedback @DJSmiley - thank you! Contactor - It's a last line of resort kinda thing and probably will cause more issues than it will help :) so I might consider removing it, but for a 250,- euro* having an additional (next to the BMSs) last line of protection is kinda...

Thanks @Rocketman, I'm not that deep into that part yet, but for say 30 euro's I can easily add that. Do you know if that works stand-alone?

MRBF fuses or circuit breakers could be a good idea, I will add it to the todo list :) Thanks @jwelter99 !

Hi everyone, My first topic starter here and it's a Diagram Check request, so shoot at it/me :) The wiring diagram can be seen, and zoomed into, here: https://lucid.app/lucidchart/293e52f2-4207-496b-9fa7-1eb2a675fdde/edit?invitationId=inv_6c856dcc-2da2-4f01-a8cd-446b4f2c2ddb The project...