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  1. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    yea cool, it would be cleaner than what I did. I hope you find a good switch. I looked for a suitable switch/relay and didn't easily find one I wanted to trust indefinitely. Looks like this is what I considered:
  2. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    yes, I think so. I don't want to charge house battery daily (I drive it for that). I want to charge it relatively quickly the one or two times I discharge it accidentally. I solved this with a couple connectors a cheap switch that allow me to use an already installed 30A charger. Is adding a...
  3. K

    DC to DC 2-Way Charger?

    I had similar requirements as the OP for my van build. I wanted the ability to charge my starter battery from house LFP battery. I accomplished this with plugs that allow me to reverse the input and output of the dc-dc charger. This won't give you trickle charge capabilities but it will save...
  4. K

    JBD BMS Help

    I don't know, but I am able to use Bluetooth and the touch screen simultaneously with the Bluetooth connected to UART and screen to RS485 port. Bluetooth updates rate is higher than the screen (for instance, current reading on my phone will do a better job of following quick changes in load than...
  5. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    switch installed in a protected location so it doesn't get accidentally pressed. It all works as expected!
  6. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    Works like a charm. manually turning on the victron orion is super simple. leave engine detection on with the jumper in (it has to be in normal operation). supply >3V to the H-pin (but with jumper in this is either pin) and it turns on. So I just need to add a switched wire from my 12V bus...
  7. K

    Any feedback on ETC cells?

    Yeah I hear you. Just trying to understand what can. The top cover peeled up and stuck back down surprisingly easy.
  8. K

    Any feedback on ETC cells?

    well look at that! another QR code scratched off under the black cover. @bobh5597815 what do you mean "reprocessed"? does this just mean "used" or is there actually some sort of reconditioning procedure that resellers/manufacturers do to bring old cells closer to original spec? And are you...
  9. K

    Any feedback on ETC cells?

    So far so good on these ETC cells. All were ~ 3.2V with 3mV delta except for one that was 8mV lower (the highest capacity tested cell of the bunch pre-shipping). They were packaged well and looked good on arrival. Only small things noticed are two small sections of blue plastic wrapping that...
  10. K

    Pre-Made batteries using 280-300ah cells options?

    See the thread below for two examples of 280Ah 12v packs built in group 27/31 battery boxes. https://diysolarforum.com/threads/280ah-4s-compressed-with-heaters-in-a-27-series-battery-box.26901/#post-335391
  11. K

    280AH 4S, Compressed with Heaters in a 27 Series Battery Box

    Yeah it's a little bit of a risk. I got these covers that almost completely cover the live portion of the post. They definitely protect from anything bumping against the top of the post which is the most likely scenario.
  12. K

    280AH 4S, Compressed with Heaters in a 27 Series Battery Box

    hey @JeepDaddy thanks for making this post. I was torn between building a plywood box, buying something bigger, or re-using a plastic battery box from one of the group 31 lead acids I'm replacing in my van. Your post gave me confidence I could make a 4s 280ah battery fit in the box (and space) I...
  13. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    In my case, starter battery is a flooded lead acid. 150A alternator 280Ah 12V lithium house battery So the options being suggested are: 1) momentary boost switch that parallels house and starter around DC DC charger pros: simple, ish cons: uncontrolled current. initial current spike...
  14. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    Thanks for the responses. Yeah, wouldn't that be nice! To clarify, this is for a daily driver beach van + camper. I do not need a trickle charger/maintainer. The goal here is to be able to start the engine if I accidentally kill the starter battery at some remote location (say, 50 miles out...
  15. K

    switch/relay to reverse DC DC charger inputs --> charge starter battery

    Question: Is it possible to use a manual transfer switch or relay to swap the input & output of a DC - DC charger, in order to charge a starter battery from a house battery? sketch attached that I hope shows what I mean This could be accomplished with: - a switch like this (most are AC...
  16. K

    Which <£400 3kw inverter? (12v/230v)

    @Aphers where were these bad reviews of the Vevor inverter charger? curious to see what the main gripes are... I wasn't really considering this as an option, but on a whim I sent them an email asking for the manual. They sent me a manual within hours. The features, interface, and layout are...
  17. K

    AMPINVT 24v/3000w Inverter/Chargers

    TLDR: AMPINVT inverter charger is just a dumb power supply :(. It does not have three stage charging like all the sigineer rebrands - maybe its made by another OEM? After no email response from AMPINVT customer support, I finally got someone to respond...on whatsapp... Yesterday he said the...
  18. K

    AMPINVT 24v/3000w Inverter/Chargers

    Sorry for double posting - I also asked here. I have the 2000W inverter charger (12V/120V). I can set a lithium/custom charge voltage. But I'm not seeing anywhere in the menu to configure absorption time or charge current cutoff, float voltage, etc. In response to a question on amazon the...
  19. K

    Ampinvt 80A Controller set up?

    Piggybacking on this thread with a related question - hoping those of you with AMPINVT units have some experience that will help. I have the 2000W inverter charger (12V/120V). I can set a lithium/custom charge voltage. But I'm not seeing anywhere in the menu to configure absorption, charge...
  20. K

    How does your inverter deal with ground.

    Thanks for all the feedback! Smart!!
  21. K

    How does your inverter deal with ground.

    I bought an AMPINVT 2000W (12VDC/120VAC) inverter charger off Amazon (open box but appears new, $350 shipped). I'd like to understand how to safely use it as a backup power supply during power outages. Battery will be 560Ah 12V. The manual makes ZERO mention of grounding or N-G bond. I've...
  22. K

    Help with proper MPPT settings for these LiFePO4

    @Hiesenfig I'm also curious what box this is - all the ammo boxes I looked at are too narrow. Can you share a name/link please? thanks!
  23. K

    Any feedback on ETC cells?

    Only able to attach 10 files. Here are the last two.
  24. K

    Any feedback on ETC cells?

    Well, the resistance data is kind of interesting. I'm not sure what equipment they used or if this data is worth spending too much energy thinking about. Also, 12 cells were tested in 2 days so they much have had multiple sets of equipment, which could affect this measurement. Maybe someone who...
  25. K

    Any feedback on ETC cells?

    Attached is an English version of the ETC277 datasheet that DIY-dan posted above. According to Xuba: "ETC280AH and ETC277AH are very similar, but the capacity of ETC280AH can reach above 280Ah or more." "There is no ETC product specification for the time being, but I believe it will be...
  26. K

    Any feedback on ETC cells?

    Just got photos back from Xuba of studs welded onto the ETC cells...
  27. K

    JBD BMS Help

    Yeah that's good enough for me, nice to know it works. I just don't want to have to open up the battery pack in my van to swap the connection between Bluetooth and screen. Thanks for the info.
  28. K

    Any feedback on ETC cells?

    Thanks Derek. I'm just about to pull the trigger on 12 etc cells from xuba. They offered capacity testing for $5/cell so I'll likely get 4 tested to satisfy my curiosity... If I get those results I'll post them here
  29. K

    Any feedback on ETC cells?

    Thanks Derek. Did yours come with threaded holes or studs? Did you capacity test your ETC cells from Xuba?
  30. K

    JBD BMS Help

    I'm also about to build my first couple batteries and will likely order JBD BMSs. I like the idea of a screen that display pack voltage, cell voltage, and current. The SOC may be off but even if it's close that's nice. Not having to connect to bluetooth every time I want to check up on things...
  31. K

    Any feedback on ETC cells?

    Thanks for the input. Xuba says they will weld 6mm studs on the cells before shipping . "There is a shop across the street that can do it very quickly"... FWIW, Dans' setup has studs but I don't know if they came installed or if he did it himself. Is it a red flag that they don't have a full...
  32. K

    Any feedback on ETC cells?

    Does anyone have experience with ETC cells? Good? Bad? depends on who you get them from and what questions you ask? This is the only thread mentioning them on the forum, though the buyer didn't mean to buy them in the end he was satisfied (and confirmed through a PM that they are working after...
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