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just stumbled upon this article; probably has been shared before but thought I'd post it here again for anyone wanting to learn about fuses/ocp etc https://marinehowto.com/battery-banks-over-current-protection/

re Bussman: 6awg is the smallest size the fuse body takes, 250kcmil (next size up from 4/0) is the maximum, so 4/0 should just fit, which is what I'm planning to run. right, sounds similar to water hammer, to make a plumbing analogy. and a surge arrestor would be like a hammer arrestor...

grounding for lightning strikes and grounding for shorts are two different things. read up on code. when grounding for shorts, ground wire only needs to be able to carry enough current for the time it takes to trip an ocp device, so is typically allowed to be one size smaller than the current...

I hadn't heard this until just today, but apparently Temu is strongly suspected of selling lots of stuff made by forced labor (aka slavery), including panels and batts probably true of much all else that comes out of China too, via Temu or Amaz or wherever... anyone know if any of the Chinese...

Not an expert here but I guess it depends on how you think you'll use the winch and how often... I plan to have a winch that lives inside my rig that only comes out for emergency self extraction. I avoid hardcore 4x4 if I can help it but you never know if you might sink in some mud or...

good stuff, thanks. yeah, will have exterior cables for compressor and winch. otherwise most major wiring should be pretty much inside the van. will likely use various combinations of conduit/loom/grommets etc yeah, internal cell damage is my concern as well. I was thinking of building my...

all 4 panels in series? in a full sun cold weather situation you might be pushing the rover pretty close to its full rated capacity, but I suppose for most of the time you'd be pretty well within safe limits. I'm not experienced enough to say what's best, but seems with 800W of panels there's...

on mounting fasteners for sure. on electrical lugs maybe not so safe... need to be careful to not reduce conductance

what size Ah batteries are you looking at? I found it more economical to get 2 bigger ones rather than 4 smaller... esp if they can flow 200A, you shouldn't need 800A for anything in a van... generally speaking it often makes more sense to go 24 or 48v but also depends on your charging system...

well, I know these things are a gamble but... same battery priced @ $988ea on ali but is sold out... $525/4800Wh = $0.11 will post again when they arrive I hope they don't burn my van up please post if you have these

you don't get a 24v 460Ah battery bank by wiring two 12v 230Ah batteries in series

make sure every wire is protected by appropriate OCP suggest a Class T fuse on main positive cable close as possible to battery after 4p connections https://diysolarforum.com/threads/great-article-about-fuses-ocp.102247/

the fuse b4 your inverter is redundant. 2/0 can take over 200A size wires to load, and fuses to wire ampacity https://boathowto.com/wiresize/wiresize_tables_abyc.pdf recommend class T as first fuse at battery you might look into the victron lynx distributor it is bus bars w/ 4 fuse spaces and...

https://marinehowto.com/battery-banks-over-current-protection/

ok, interesting. guessing that's why I hear a crack/pop in my speakers when certain electric (household a/c) loads shut down? the winch doesn't run off the inverter, but assuming that doesn't matter, right? so run +/- cables parallel and add a spd. Midnite Solar MNSPD-300-DC Surge Arrestor...

also, just for a little more clarity on the grounding... the vehicle engine starting batteries/alternator/electrical equipment are all essentially grounded to the frame/body (I believe at multiple locations(?), but main ground point of the system would be where big neg battery cable connects...

well, for anyone else who might be curious... I asked this b/c I saw a post on here a while back (that I can't find now) but someone suggested staying below a certain Ah cell size for use in mobile situations... I want to say the suggestion was maybe <200Ah. I've been doing a little reading and...

no other way to install such that your wire doesn't need to move in/out with the slider? if this is a ground, maybe sufficient existing continuity b/t slider & main frame?

I'm not an electrician, but here's my amateur opinion: Far as I've ever heard, a "roof port" is not a device that has an amapcity rating. It's just a thing wires pass through, right? That is not something to design your system around. First step is to calculate how much power you need/want...

greetings all... I know there are thousands of posts on here regarding electrical system safety, but I'd like to get a thread started about a system I'm building with particular focus on how to maximize safety in this particular situation. I have a 4x4 E-250 and regularly drive very rough and...

thought of another question. would the best place to install SPD be where the winch hot wire bolts to the 400A class-t fuse block? thereby protecting all devices "upstream" of the kickback? (this is assuming that it makes more sense on the positive side of the circuit) just scratching the...

thinking of building one or a pair of 24v batteries for use in a 4x4 camper/van. lots of high vibration (washboard, bad roads) and 4x4 type use. wondering about cell size/capacity and other construction variables all other variables being equal, are there relationships b/t cell size/capacity...

wire and fuse sizes have nothing at all to do with the size (Ah) of battery (though bms may determine max ampacity); wire size is determined by max expected amp flow from battery to load, and fuse size by ampacity of wire. sounds like you should run a large wire from battery to a 12v fuse block...

understood, thanks guys!! Bussman accepts accepts 6 AWG - 250 kcmil. regarding winch amps... the one I may use (HF Apex) maxes out at a little over 400A @ 12,000 pounds pull iirc. That's more than the full weight of my rig. I'm not a serious 4x4 guy, just have winch for emergency self...

apologies for the kindergarten level scribble scratch... hopefully legible; obviously not to physical scale this is for a 4x4 van install red = + side black= - side green = OCP blue = devices 2 @ 280aH LiFePO4 batteries, 200A continuous (ea) BMS 2 @ 200W panels The component accepting the two...