I have a 300Ah 12V LiFePO4 battery setup with three 100Ah batteries (internal built-in BMS in each battery) in parallel. I have it fused at the parallel junction with a 400A fuse.

I want to put a 125A MRBF fuse on each battery instead. If I do install per-battery fuses, is there a reason to keep the combined big fuse as well? I see wiring guides recommending both but I'm not seeing any explanation for why.

The reason for moving is that the current fuse gets way too hot when pulling 300A sustained. I don't have room in my setup to easily install the really big fuse holders with heat sinks that are made to handle 300+A sustained current. (Yes, I checked the voltage drops across all my connections. They are very low. It really is the fuse getting hot and not a weak crimp etc.)

How hot are fuses supposed to get / what kind of voltage drop is expected?

I built a system which should allow 300A discharging (1C) / 150A charging (1/2C)

But if I run more than 60A, my main battery fuse gets hot. If I run 300A the fuse get rapidly gets too hot to touch, and the heat spreads through to the attached cables, the battery, and the temperature sensor on the positive battery post. Is this somehow normal?? I’ve tried three different types of fuses with no real improvement.

— Here’s a photo of my installation with voltage drops labeled at 60 amps draw only. I don’t have voltage drops measured for the 300A draw because I don’t want to leave it running that way for long.

The main fuse on the battery is a 400A ANL fuse. I’ve tried with a 300A MRBF fuse and with two 150A MRBF fuses in parallel. All of them get hot to the touch when drawing over 60A.

Help?

Ok, I don’t know where else to post this and I have to tell somebody, so y’all get to suffer:

I checked in to a campground this week and the earnest guy warned me very seriously that THREE different people have seen a cougar prowling the campground recently. They don’t know if it’s all the same cougar, or could be maybe three different cougars, but be careful.

Also there is a resident bear who frequently comes around disturbing the guests.

And I had to listen to this with a straight face and tell him I’ll watch out and not make any dirty jokes in response. It was very difficult.

Anyway so I have definitely been keeping a close eye out for cougars but I don’t know if I’ve seen any. 🐈

Not sure how to add multiple pictures to a Lemmy post. I have close-ups of the alternator housing and I think maybe the throttle body, melted 80% into the asphalt.

Contrary to my own misleading title, this picture was taken in Death Valley National Park up on top of a mountain where the air is crisp and cool.

I think I'm about to buy a Velotric T1 ST Plus which would be my first ebike.

The manual says to store it indoors at a temperature of 50°F to 77°F (10°C to 25°C). However the location I actually have to store it in is in an uninsulated shed that will probably reach 120ºF (50ºC) in the summer in baking sun, and below freezing in the winter.

Is this going to kill the bike or its battery?

I have a U.S. Sailing basic keelboat cert and a couple hundred hours’ experience day sailing 22’ Capri and dinghies in protected water.

With that level of experience, who will rent me a boat to noodle around in San Diego bay?

I have an off-grid setup with a few devices on a local network that is not connected to the internet. I can tell my iPhone to use the non-internet wireless LAN to talk to those devices, OR I can tell it to use cellular data to talk to the Internet, but there’s no config on the iPhone side to let them be both live at the same time.

Is there any magic config on a wireless router e.g. certain DHCP settings or just disable DHCP, that will let the iPhone route to static 10.x IPs on the WLAN while the cellular internet is still active?

Any “advanced network settings” on the iPhone to manage multiple NICs?

All traffic must turn left

So much aggressive off-road in so little space

I find after this election that I have an unexpectedly pressing need to wave large obnoxious flags from my sensible fuel-efficient subcompact while I drive.

Has anybody got models, templates, suggestions for how to mount a stout pole to a hatchback? I’m thinking of some kind of tube on a short arm that I could close the rear passenger door or the cargo door on to hold it in place.

I have some little black ants in my motorhome. I’m pretty sure I picked them up at my last stop in upstate New York but I’ve since driven far away from there. Wikipedia says little black ants nest in the soil so presumably I didn’t take their queen with me.

What’s going to happen to this group that hitched a ride? Are they likely to elect a new queen and go looking for a good nesting spot, or curl up and die, or what?