There is nothing wrong in connecting batteries in series to increase the overall voltage for the application. There is no safety issue with series connection as the batteries has no chance of fighting one another. If a cell in one shorted, the result is a lower overall voltage. The problem with connecting them in parallel is if one cell in one shorts. The other battries will try to balance the voltage and dumping a lot of current into the bad battery cause it to produce significant heat. Hence a series safety problem. There may be folks claim they have don't this for years and never have a problem. This is like saying I have been overloading my wiring at home for years and my house haven't burn down - so is the proof it must be OK.
- Vince http://gipsyflies.home.comcast.net 1989 Vanagon GL Camper 1993 Mazda Miata (for sale) 1996 Land Rover Discovery 2005 Mini Cooper S
-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Fin Beven Sent: Tuesday, September 21, 2004 2:01 PM To: vanagon@GERRY.VANAGON.COM Subject: Combined Optima Batteries
http://www.optimabatteries.com/publish/optima/americas0/en/config/produc t_info/automotive.html<http://www.optimabatteries.com/publish/optima/ame ricas0/en/config/product_info/automotive.html> Combined Optima Batteries... Vince.... Thanks for the response. The little S/S screws actually don't so much act as the contact as they do a wedge, forcing a fine contact around most of the ring between the core and the outer ring. Your solder suggestion is great. If I had any welding talent, I might be able to fill what small gap remains, then remove the screws, and then fill that small hole as well. Like you, I wouldn't "preach" the combining of batteries. I have used the same process on sailboats that race offshore (races from SoCal to Hawaii and Mexico) for years. We are typically away from outside help for 6 - 12 days at a time. Extra weight is a BIG thing on these boats (lighter is faster), and a dedicated starting battery that does nothing the other 23:59:55 of the day would be avoided. Since I never "isolate" my other battery, I could not see the purpose of a relay or other device. In the attached photo from the Optima web-site, it looks like they are doing essentially what I have done. Although, curiously, they appear to have joined their batteries in series, producing 32 volts if we are seeing all of the batteries involved. What, do you suppose, runs better on 32 volts ???? I guess I'd take this as an Optima recommendation ??? for joining batteries. Fin. |
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