Hi, I’m a little confused on fuse sizing within a 48v system. I plan on having 4 renogy core mini 12.8 200ah batteries in series. It states in the charging parameters section on the page that it has a voltage range of 10-14.6V, 14.6x4 is 58.4 so does that mean the batteries will reach that voltage? I’m struggling finding a fuse holder that is greater than 58 volts.
Many thanks
Yes if you put them in series. You’ll need a T-Fuse. Be aware of Icc ratings for any fuse you use. If you don’t understand what that is then please do research because it will prevent a catastrophic event.
I’m curious why you want to complicate everything by going 48v?
48v is good and will be the future. It’s more efficient and smaller wires. Cheaper and more space. However there are some challenges making it more difficult to diy. I think 24v is a the sweet spot
I’ve been hearing this for many years, yet the industry maintains the 12v standard. Complicating the simple, easy, cheap, reliable, and easily replaceable, rarely ends well.
At 48v EVERYTHING must be converted to either 12vdc or AC power to be useable. Converting it creates unnecessary losses, and adds extra components to fail.
On the road, standard parts are usually readily replaceable if needed, where these components will need to be special ordered, because you won’t find them on the shelf anywhere.
Unless you find a 48v alternator, you’re converting 12v to 48v to charge the battery bank while driving, then back down to 12v to make it usable.
If your solar is 48v, then just let the controller convert it to 12v and keep things standard. The idea of saving money on wiring is also incorrect because the systems are still either 12v or AC, so the bulk of your wiring reflects that.
Raising the voltage does not translate to more power, just added complexity.
They’ll only reach 58.4V if your charging system charges them that far 
Opinion: In practice there’s no point going beyond manufacturer’s recommended, which might be close to 3.6V for LiFePO4 per cell, 14.4V for the battery, 57.6V for your 4S configuration.
I only charge mine that far when I want to be sure to trigger cell balancing. It usually stops at 90-something % (I forget the exact figure). The charging curve for each manufacturer can vary a bit, but once you go just a bit over 3.5V per cell while charging, you are at about 95% full, on the bit of the charging curve where the voltage changes a lot for a small amount of extra charge.
By the way, I don’t know the Renogy Core setup, but in general your 4S setup will need something to maintain balance between the 4 x 12V batteries–or do the Renogy batteries talk to each other to do that?
The thing with fuses is to get good quality fuses. Amazon specials, if you are not careful, may blow too easily, or even fail to blow in good time at double their rated current. Their voltage rating is mainly to make sure that they blow cleanly when they blow, without arcing. The wire, battery spec and fuse sizes work together, so that if there is a dead short, enough current will flow to blow the fuse rapidly and protect everything before heat builds up.
There’s a lot on Youtube about fuses, some of it not so good, but I found a good one that tested them for heating at rated current, time to blow at 2 x rated and time to blow at a higher current, but I forgot to save the link–can anyone recommend, please?
Roops