Battery Fuse size

[donzie67]

I have a Xentenx XPower Inverter 1750 Plus. I want to connect it to my battery bank that consists of 4 6v Interstate GC2-XHD batteries. 232ah each. I am going to create 2 12v banks and run them through a Perko Switch model #8503DP. This is the one where you can run each bank separate or both and able to shut them off as well. I am using 4/0 cable for the batteries and to the Perko Switch as well. I have done this on my last two campers without a battery fuse. My new camper is a FR 2014 Crusader 260RLD. I had a 150w solar panel with a 30a charge controller installed. Plan might be to add a second 150w panel if needed. I want to know what size fuse i should put between the batteries and the inverter. I'm installing the inverter and the batteries myself. Also I read in some threads about a shunt. Have not figured that one out and if I need one.

[glen1971]

4/0 cable? You shouldn't lose half a volt with that in your rig...

From your Inverter Manual...

Calculating Fuse/Circuit Breaker Size

Because your batteries can provide thousands of amps of short-circuit
current, you need fuses or circuit breakers that can safely withstand the
short-circuit current that the batteries can produce.

To select the correct fuse type and size:

1. Determine the total short-circuit current rating for your batteries. For
example:
• If you are using one battery to power your inverter and its shortcircuit
current rating is 500 amps, the total short-circuit current
rating is 500 amps.
• If you are powering your inverter with two 12 volt batteries
connected in parallel, and each battery has a short-circuit current
rating of 500 amps, the total short-circuit current rating is 1000
amps.
• If you are powering your inverter with two 6 volt batteries
connected in series, and each battery has a short-circuit current
rating of 500 amps, the total short-circuit current rating is 500
amps.

Note

: For batteries connected in parallel, the total short-circuit current
rating is the sum of the short-circuit current ratings of all of the batteries
connected in parallel. For batteries connected in series, the total shortcircuit
current rating is equal to the short-circuit rating of a single

battery.

2. Once you have determined the total short-circuit current rating of
your batteries, pick the fuse/circuit breaker’s interrupt capacity based
on the short-circuit current calculated in step 1.
3. Pick the fuse/circuit breaker’s current rating based on the product
used:
•

XPower 1200 Plus: 150 Adc
• XPower 1750 Plus: 250 Adc
Fuses can be bought at any marine supply store, RV supply store, or

electrical products store.