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Old 09-24-2017, 06:10 AM   #1
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Need a pair of these for fusing battery

I am reworking my house batteries to get less losses to the inverter and I am starting with fuses at the battery terminals to eliminate a 300A circuit breaker that I think has excessive internal losses.
I am also going to upgrade, simplify & shorten the wiring.

I found these nice fuse to battery post package on a UK website and a pair with fuses and covers is a bit over $50 (US) but shipping is $80!
Anyone see this or similar in the US?
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Old 09-24-2017, 06:22 AM   #2
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I have seen those used on boats. Maybe someplace like West Marine might carry them.
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Old 09-24-2017, 07:26 AM   #3
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Can you get that fuse over here if you do blow one or it succumbs to corrosion?

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Old 09-24-2017, 08:18 AM   #4
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I looked over the marine site briefly and no luck, as for the fuse, it looks like a standard BUSS style fuse.
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Old 09-24-2017, 08:37 AM   #5
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This is the web site link in the UK
http://www.12voltplanet.co.uk/batter...ube-fuses.html
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Old 09-24-2017, 09:42 AM   #6
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Is this the fuse going from battery to inverter?

If so I think the standard to use is a T-fuse, see link before.

Also, If your unit is original factory, it is likely the wiring is way to small, and you will get much better return and lower resistance by adding larger gage wire and a T-fuse...

Thanks

http://www.airforums.com/forums/f449...ml#post2012527
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Old 09-24-2017, 09:47 AM   #7
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Digikey has this stuff.

The terminal is found here, and the fuse is here.

In single unit quantities, the terminal is about $21 and the fuse about $8.
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Old 09-24-2017, 09:59 AM   #8
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After seeing the fuse close up, you don't want that right on the battery post. I would put it at the inside terminal end where it is protected from battery acid. Also it would take much less time to replace if it were in a terminal strip inside the trailer.

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Old 09-24-2017, 10:48 AM   #9
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Quote:
Originally Posted by alano View Post
Digikey has this stuff.

The terminal is found here, and the fuse is here.

In single unit quantities, the terminal is about $21 and the fuse about $8.
That one is vertical, the one I need is horizontal. I have very little clearance above the battery post in the slide out drawer, that is what makes this method attractive.
As for the installation, it is home brew wiring to a 1800 watt inverter,converter and solar gear inside the MH, the batteries are in a sliding drawer below the inverter.
This is my setup: http://theouterlimits.ws/projects/ai...lar/Page2.html The current battery/inverter section is about 1/2 way down the page.

As for putting the fuse right at the battery, acid/corrosion wont be the biggest concern, I will use a 300 amp fuse on each of 2 batteries, then the cables go 6" to the battery switch, so it is messy using any other method
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Old 09-24-2017, 02:09 PM   #10
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May I suggest that you 'Keep it Simple'?
Buy a single 300 Amp fuse, or a couple of in line 150 Amp fuses,("Lift truck fuses"), that bolt onto any terminal; and put it at the battery on the Neg. Terminal.
If you use 150 Amp, put one on top of the other, or at least in parallel.
This will give the whole house, protection from a 'dead short'. eg: a wrench dropped on the bare wire somewhere.

Perry's idea might be worth looking into also.
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Old 09-24-2017, 03:10 PM   #11
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Quote:
Originally Posted by perryg114 View Post
After seeing the fuse close up, you don't want that right on the battery post. I would put it at the inside terminal end where it is protected from battery acid. Also it would take much less time to replace if it were in a terminal strip inside the trailer.

Perry
First rule of circuit protection (i.e. fusing) is to put the fuse as close to the power source as possible to protect as much of the circuit (i.e. wire) as possible. For that criteria, on the battery terminal is perfect. Moving the fuse into the trailer would mean a chunk of wire was not protected against a short circuit. I wouldn't personally take that risk.
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Old 09-24-2017, 03:41 PM   #12
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Just brainstorming here.

How about combing a Top to Side post battery adapter with a
Blue Sea MRBF fuse holder set on its side?


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Old 09-24-2017, 03:50 PM   #13
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Quote:
Originally Posted by greghoro View Post
Just brainstorming here.

How about combing a Top to Side post battery adapter with a
Blue Sea MRBF fuse holder set on its side?

Greg
Thanks, but just like the Jameco part, there may be height clearance problems.
It is to late today, but tomorrow I will try and get photos to show the situation that I am dealing with on this battery drawer
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Old 09-24-2017, 09:27 PM   #14
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Hi there Wayne,

Shorter wire runs and loss free connections are positive steps to improving your inverter performance, but are you measuring a significant voltage drop across the 300A breaker that would justify replacing it?

DG
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