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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!wupost!waikato.ac.nz!aukuni.ac.nz!mercury!fivegl!derek
- Newsgroups: rec.autos.tech
- Subject: Re: Electrical Question: Multiple Batteries?
- Message-ID: <1992Aug17.061509.6637@nezsdc.icl.co.nz>
- From: derek@nezsdc.icl.co.nz (Derek Tearne)
- Date: Mon, 17 Aug 92 06:15:09 GMT
- References: <CMM.0.90.0.713813115.siegman@Sierra.Stanford.EDU>
- Organization: Fujitsu New Zealand
- Lines: 41
-
- In article <CMM.0.90.0.713813115.siegman@Sierra.Stanford.EDU> siegman@SIERRA.STANFORD.EDU ("Anthony E. Siegman") writes:
- >Anyone out there with experience on using, and recharging, multiple
- >batteries in a vehicle?
- >
- >My son is a small contractor, one of whose vehicles is a big old parts
- >van. The van gets driven to a job site, then sits immobile for 3
- >weeks, holding job supplies and a communications radio for the job
- >crew which is left on 8 hours/day. This is too much for the regular
- >battery; after 3 weeks it's dead.
- >
- >Proposal: Install a heavy-duty (marine?) battery for the radio, plus
- >an AB switch. Drive to the site on the regular battery, then switch
- >to the heavy-duty backup. When it's time to drive home, switch back
- >to the regular battery, start the truck, and drive home. Recharge the
- >heavy-duty battery either with a 110 V trickle charger at home, or by
- >switching back to it after the engine is started.
-
- You can fit an extra battery and charge it from the alternator using
- a split charge relay. These should be available from any Caravan (trailer
- /mobile home) centre or accessories vendor and don't cost very much. Hella
- and Lucas both make good units. This handles charging both the main and
- auxiliary batteries without having having to switch over or anything like
- that. Wire some sockets from the auxiliary battery and run the equipment
- from these. You can now run the auxiliary battery as flat as you like
- and still be able to start the vehicle. If your auxiliary battery runs low
- just go for a couple of hours drive!
-
- I have had a setup like this with internal and external sockets (made by
- Hella) to run lights and equipment from and a neat little fuse box for
- the auxiliary circuits.
-
- If you are regularly running the auxiliary battery flat then you may need
- a 'leisure' battery as these can be run flat without bending plates etc.
- They cost more though. Again a camping/mobile home place should be able
- to give you specific advice for your needs.
-
-
- --
-
- Derek Tearne. -- derek@nezsdc.icl.co.nz -- Fujitsu/ICL New Zealand --
-
-