---------------------------------------------------------- L29-List Digest Archive --- Total Messages Posted Fri 02/27/09: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:09 AM - Re: External start battery (Jorgen Nielsen) 2. 03:07 AM - Re: External start battery (Colyergreg) ________________________________ Message 1 _____________________________________ Time: 12:09:26 AM PST US From: "Jorgen Nielsen" Subject: RE: L29-List: External start battery OK an update. I spoke with a battery manufacturer here in SA, and went through all kinds of options to try get a battery based 28V system for external ground start. We even played with some off the wall ideas such as building me a one off car type battery but with only 2 cells connected, not the normal 6, to give 4V. What we have settled on is using 2 big car type batteries to give 24V. In addition, I will use two 2V batteries as well to boost the voltage up to 28V. These 2V batteries are rated at 186Ah capacity, can deliver more than enough current. 20 years life. They normally used here in SA in mining locomotives. I have a programmable charger that can deliver 5A, and I can set it for 4V. When I make up the unit I will tap off some charge plugs for 24V and 4V to make it easy to charge. I will let you all know how it all works out. On another note: I have been using a 24V charger for some time, to charge my normal 24V ground start batteries and also to top up the onboard batteries. I battled to find a 24V charger initially, than had a bright idea and bought a fully electronic version from a electric scooter supplier. Been working well so far. Regards to all on the list. Jorgen Nielsen ________________________________ Message 2 _____________________________________ Time: 03:07:05 AM PST US From: Colyergreg Subject: Re: L29-List: External start battery Sounds like you figured it out, now let see how it works. Sent from my iPhone, Greg On Feb 27, 2009, at 12:04 AM, "Jorgen Nielsen" wrote: > OK an update. I spoke with a battery manufacturer here in SA, and > went through all kinds of options to try get a battery based 28V > system for external ground start. > > > We even played with some off the wall ideas such as building me a > one off car type battery but with only 2 cells connected, not the > normal 6, to give 4V. > > > What we have settled on is using 2 big car type batteries to give > 24V. In addition, I will use two 2V batteries as well to boost the > voltage up to 28V. > > > These 2V batteries are rated at 186Ah capacity, can deliver more > than enough current. 20 years life. They normally used here in SA > in mining locomotives. > > > I have a programmable charger that can deliver 5A, and I can set it > for 4V. When I make up the unit I will tap off some charge plugs > for 24V and 4V to make it easy to charge. > > > I will let you all know how it all works out. > > > On another note: I have been using a 24V charger for some time, to > charge my normal 24V ground start batteries and also to top up the > onboard batteries. I battled to find a 24V charger initially, than > had a bright idea and bought a fully electronic version from a > electric scooter supplier. Been working well so far. > > > Regards to all on the list. > > > Jorgen Nielsen > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message l29-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/L29-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/l29-list Browse Digests http://www.matronics.com/digest/l29-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.