OFF TOPIC ELECTRICAL QUESTIONS
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=105667
Printed Date: 10 Sep 2025 at 6:23am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: OFF TOPIC ELECTRICAL QUESTIONS
Posted By: HVFDFIREFIGHTER
Subject: OFF TOPIC ELECTRICAL QUESTIONS
Date Posted: 04 May 2015 at 8:18am
|
I have two 6 volt 215 amp batteries connected in series to make a 12 volt battery. I will be charging the batteries with battery charger connected to a Yamaha 200 watt generator. The batteries will be connected to a 1500 watt power inverter, with modified sine wave (converts the DC to AC) to power electrical items (lights, radio, fan in a hunting camp that I just purchased. 1:Do I need a fuse on the positive side of the charger? Or do most chargers already have a fuse? (I need to buy a charger yet - looking at either a 30 or 40 amp smart charger) 2: I KNOW I need a fuse on the positive side of the battery before the inverter. What size fuse should that be? ( I am running 4 gauge wire) 3:Can it be an AGU fuse (only goes to 100 amps) or does it have to be an ANL type fuse. The inverter is 1500 watts constant, 3000watt surge. I am not planning on running much out of it other than lights, fan, radio, maybe TV and DVD. I figure at MOST 800 watts or 7 amps an hour for 6 hours. Total watts used 42 AMPS per night (give or take). I know this post is off topic. I know everyone on here is pretty knowledgeable. Any help would be a appreciated. |
Replies:
Posted By: jaybmiller
Date Posted: 04 May 2015 at 8:27am
|
answers 1) most( all) battery chargers have an internal self resetting circuit breaker, so just connect it to battery. 2) hmm..need to see the 'specs' of the inverter,even the model #, then I can google it... 3) don't know, again like #2, the invertor spec sheet should tell us... hay, it's a start..... Jay ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: HVFDFIREFIGHTER
Date Posted: 04 May 2015 at 8:49am
|
here is a link to the inverter I am using. I have the 1500 watt version www.energizerpower.com/pdf/EN1500_2000_MANUAL_EN.pdf It looks like I need a 150 amp fuse? |
Posted By: lowell66dart
Date Posted: 04 May 2015 at 9:57am
|
I was always told that the fuse is to protect the wire. Use a fuse with a rating below the capacity of the wire and your ok. I thing AC and DC are also different. ------------- AC 6080 (8030,7060,200,175,D-17HC, 6040,160,6140 all gone) Farmall 1066 & 656 Hi-Clear (for sale), White 2-62 High Clearance, JD 4255 Hi Clear. |
Posted By: Gerald J.
Date Posted: 04 May 2015 at 10:47am
|
The 3000 watt inverter will draw 1.1 x 3000 / 12 = 275 amps at peak load presuming its 90% efficient. That kind of current needs 6 volt starter cable size, like 0 or 00 copper. 4 will overheat and have excessive voltage drop. Probably means 300 amp fuse too which will also add voltage drop if the inverter isn't self protected. Gerald J. |
Posted By: DaveKamp
Date Posted: 04 May 2015 at 10:56am
|
I would put a fuse between the charger and battery, another between battery and inverter, simply because the impulse energy you have on-tap with those two batteries is sufficient to cause lots of really, really bad things to happen if anything should happen to the wiring or protection of your devices. I would size the fuses to be no more than about 20% higher than the expected limit for the machine. If the charger is a 200W, then you're looking at 200W / 14.2v = 14A. Use a 20A fuse and 12awg wire... if the wire length is long, use 10awg wire, but keep the fuse near the battery. If your inverter is rated for 1500W, you'll pull AT LEAST 1500/11.5=130A. Notice I used 11.5v for this calculation- that's because battery voltage will sag under a heavy load, and the inverter will compensate by drawing more current. The inverter isn't 100% perfect, there's base draw of usually about a half amp (just to be on) and it's probably got 10% loss of efficiency, so figure 130+13+.5=145A range, so a 150A fuse. This won't be an ordinary plug-in type... there are automotive DC fuses that have bolt-on lugs, but another way you can do it, is use an old AC knife-switch with cartridge fuses. They're AC, and intended for higher voltage, and they may not be perfectly accurate in their 'blow' point, but they'll work, they're common, cheap, and easy.  ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |