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To the original question postulated in the thread. Does anybody have a close-up picture of the mosfet used in the overkill solar/jiabaida/xiaoxang BMS? A quick look at the datasheet can give insight into whether it can handle being in series to a higher voltage. As to parallel, as long as each...

Cool! Can you share the correspondence?

QUESTION: Anyone know/try if the ubiquitous 4s/12v BMS (from JiaBaiDa brand, xiaoxiang, china mfg, etc) can handle being placed (4x) SERIES to 48V battery bank? MORE INFO: I would be using (3x) VICTRON BATTERY BALANCER ($65 ea) to go in between each pair of 12V batteries I make. + lead ----...

Great discussion! The challenges of safety for DC compared to AC is interesting food for thought. Can you elaborate on not needing a fuse? I would think if a short is happening, it means something is wrong, and you would still want the circuit to cut off. Great resources. What is the...

I don't understand 'handling cells as pairs'? I don't know their algorithm exactly but as 16s configured would handles all 16 cells at the same time. I'm not aware of any extra 'pairwise' functions. Also yes, any of the expensive BMS would work. The point was to figure out if this alternate...

Oh this is interesting, do you twist them too or just side by side?

excuse a dumb question: Does this 'modbus RTU over RS485' integration with the Venus OS software give the same features as CAN enabled BMS? Like will the Venus then use that info to control a Victron inverter and/or MPPT charger? Also, I can't find info on exactly what real benefits a...

I've heard this description before and don't fully agree that the voltage is zero when the path is open circuit. There is still an OC voltage. That's what a DMM does, is measure that open circuit voltage without actually having a load (ideally infinite Z) Can you specify if you are talking...

I'm a bit confused to the purpose of the unit. from the SPS site, are 50a RV electricals normally wired with a Main and Sub panel? So the 'main' loads are not available when off-grid? Also confused to when you need 50a,120/240.When do you actually exceed a 120v/30a service, that's ~3600W...

What is your config for 32 cells? If 2p16s, then of course the Orion would work. I assume you have the Orion Jr? version 1 or 2? I asked the question as a practical matter for $$$ and also for a technical curiosity to crowdsource experienced people's knowledge. Though I do appreciate the...

Very true. I don't know what an 'energy audit' is, but I have this. My biggest potential draw would be a 700W AC on for 6hours = 4.2kWh. The voltage (12, 24, 48) I choose will impact the chargers, inverters, electrical connection sizes. However I can achieve this kWh needed with any voltage...

I have the exact same BMS and just got it online today. What app are you using @Simi 60 The xiaoxiang app on iOS requires pay to configure, wondering if that is the norm.

I'm understanding that the fuse rating is for not tripping but for normal operation, and one must exceed it by a safety margin to blow. Then why do normally we add that 1.25 or 1/0.8 nuisance factor if the fuses account for that already?

three A/C units! Ok now makes sense. Would probably not need this for a van build then. I understand the part about the 4 wires, the receptacle has L1, L2, N, and PE/gnd. Theoretically, you could run US 240v appliance off this if your rv had it. I was wondering if any RVs actually had them...

So you have the ACin wired up to a 50A RV plug style (with L1,L2,N,PE)? What happens when you encounter a 30A style plug? Can you physically have two styles of female plugs wired in parallel on ACin (so L1,N,PE branch off to another plug)? Also can you explain what the transfer switch lets you...

What is the best known practice of connecting these? A fuse and switch for each parallel string? Or only switch on every string and a large T-class fuse rated for the total combined after the combination node.

@Prefersdirt what did you end up doing? Also curious if buying one color (saves money to buy bulk in one color) and labeling them at the ends is ok, or considered dangerous practice

This seems like a long time, but I need some experience with how fast wire get hot get when used at different multiples of their rating. Non-sinusoidal, as in DC?

Yes agreed. But then what do you size the wire to? This implies that we size wires based on what the battery bank can output. I don't think so. Example: what if you have 100 batteries in parallel, you're not going to size the wire to what the battery can output. You can't You size it to the...

Thanks for walking me through that! I like those rule of thumbs, very useful. I guess I should go and price out some wire based on a 5% (from Victron) loss goal and see the difference. I'm sorry I may have misled. My mention of 700W AC was focused on battery capacity. Focusing on losses in...

From San Jose, CA. Selling because I'm going to 24V system. Purchased for $1,570.80 + tax. Selling for $1420.

I think we are agreed about protecting at it’s rating. So the original question still stands does a OCPD at every individual parallel battery constitute “protection of the wire” after the combination of the parallel batteries?

I had this experience when you waste more money overall trying to save...should just pony and get the best from the start So in place of a contactor you have a what?

Excuse the directness above, I only wanted to correct your statements for others who are seeking information. You mention top balance in your reply, so I assume that we are on the same page from here. agreed It is generally known that higher charge currents cause the cell voltages to read...

Wow thanks! What is the thermal pad, that gold looking bar across the row of mosfets? Nice detective work! I was looking for like 15minutes but could only find spammy rando websites also. I can't imagine that these mfgs even have the data to compile into a datasheet. Maybe they just copied...

can't see the diagram for some reason... Edit: nvm you simply have to right click the question mark and download it. Edit2: @cinergi are you going to update this with your final design with the orion bms? I have lots of questions I think a diagram could answer, thanks!

Also have NEW Cerbo GX (bought for $340 + tax) selling for $300 And NEW GX Touch 50 (bought for $232 + tax) selling for $200