I've ask among my contacts and they recommend:
Relé / Isolator
The Ladac (Ladix) system is said to be better since will not open the circuit to the second battery before the starterbattery is fully charged.
I've thought about this for ages, i.e. since The Crystal Rally 1994. I would have needed two batteries at that time. Looking into the options back then I could not find any workable solution. On the R80 1984 I could have installed one 30Ah or two 14Ah, since the Bosch startermotor kind of requires a minimum of 19A at summer and 24Ah at around freezing, I crept to the cross... and accepted that a solo-bike have not enough space for a second large battery. The 28Ah were ok when temps stayed above -15'C but even at so moderate temps as -20'C they simply were not powerfull enough. At www.sga-ab.se
they recommended that I should test Banner 53030, 30Ah, - these 2Ah tipped the scale in my favour.
Since 1995 I'm running a Valeo-starter motor. With this startermotor I think a 14Ah would do nicely however
I stay with the Banner 30Ah, but I have an Odyssey PC-625 for my summerbike, and this battery have so far proven to be far superior to the Banner, Yuasa and BWM batteries that I have had during >30 years of driving bikes and cars.
- space is a limiting factor on a bike
- if one uses electrical equippment like car-radio with amplifier, lights, etc it it far better to have two smaller batteries than one large; ensuring that the starterbattery will not be depleated "by accident".
- best option is to have a battery switch that is fully electronic, that primarilly fills/charges the starterbattery, even though a simple 40A relay will also work ok (my buss have had this set-up from factory in 1995).
How far have your plans developed Brama?
Which batteries have you considered / can be installed?
Installation solutions? Pannier, pillion seat, top-box, ???
Last edited by dc lindberg; 30 Jun 2011 at 20:19.