Originally Posted by Uncle Bob
Hi, a question for the electrical
guru's, I have decided that the house bank definately should be fused, what configuration would you guys recommend ?
The battery bank consists of 6 235 ah golf cart batteries wired as three pairs, all to a common point thence to switching which would enable the house bank to be used as a start battery should the need arise.
I was considering a 150 amp fuse to each battery pair mounted within 6 inches of each pair, is this overkill, would 100 amp be sufficient ?
Would it be better (and cheaper
) to just use one fuse at the common point ?
Would value all your opinions, thanks.
As others advised, a single
fuse sized for your smallest cable run length from your battery bank to the distribution panel will add the protection you are after.
That is how our house bank is currently set up as well. [8- 6 volt golf cart batteries in one sealed, vented battery locker...]
However, next time I replace the batteries I intend to fuse each pair of 6 volt batteries [in series] so I can easily isolate a bad battery [and its mate since they are 6 VDC and my boat is 12VDC...] This bank of 4 fuses will be located where I can easily get to it. This means I will have 4 [lower capacity] fuses for each of 4 pair of batteries, and one main fuse [higher capacity] for the primary lead to the distribution system. [I have 3rd party schematics and more info if you are interested...]
This is just another way of looking at it, and a fairly common approach for batteries that are not readily accessible... If your batteries are accessible, then this may be overkill...
Also, it may be worth mentioning that since my battery bank is secured in a less than accessible locker, I installed a centralized watering system to keep them topped-up. Works great. There are more details [and photos and links] on my blog post about replacing the battery bank
if you are interested...
It is great you are fusing your house bank. Otherwise we all have a floating 12 volt toaster if something goes wrong...