Why would you need to hang them upside down? I would not. Flat, on edge or up is fine. Odd you'd think you need to do them upside down!
I believe upside down is 'not recommended' from the OEM. It SHOULD only be a problem in cases of overcharge/overheat venting, which would hopefully 'never happen'.
I would think that you would still need them not exposed to weather or road grime...so possibly laying them flat for easier access??Well we would like to install them in a pan underneath the car, if we were to have them upside down we could still access the terminals without removing the pan.
if your controller is limiting max amps to 3x the battery C (ah value) you *should* be pretty safe from overheat during driving. I f you are really concerned, one thermocouple on any one of the terminals to get an aprox read on the battery internal temp would be the best warning.... I don't foresee "ruinous amounts of current" moving through them. However, we didn't take into account the venting.
not exactly. the 3C limit is 'suggested' by the OEM, and is not exact, but intended to provide a suggested limit to avoid internal overheating. The more current you draw, the more internal heat you get from (small) internal resistance. This is why the lower internal resistnce batteries are more expensive, but can take higher C. At 300 amps, a 100ah system would only go 20 minutes, not 'all day'.Dan,
3C for a 100ah pack would be 300 amps continuous or all day long correct?
until the internal temp exceeds spec, the case heats, the electrolyte vaporizes and vents..... you might extend the period of high-C draw with cooling, but it will probably kill their life. If you want high-C dragster performance, you need to spend LOTS more money for batteries that are rated for it....Ok, so if you have a 156 volt pack and a 1000 amp controller and you do not limit current, is there a chart or rule of thumb for how long the Thunder Sky batteries can deliver higher currents?
I don't have hard and fast specs for you.... but you probably CAN pull more for 'short' periods, but you will affect cycle life and need to watch temp. best way to do that (from video) is a thermocouple on a post to get a handle on the internal temp. Simple fact is, if you race, its hard n the equipment.For example, our car with lead acid will pull 600+ amps under full acceleration for a very short period and the current decreases as it accelerates. Will this be safe for the Thunder Sky pack, or should we limit the current to 300 amps like you say. My problem with that is the lack of acceleration ability when using short bursts, especially when we autocross. Won't the Thunder Sky pack be able to deliver higher current for short periods without worrying about damage. Guess I just need specs on how long at what current.
yes, plus you will have basically no voltage sag.When we install our lithium pack we will be 600 pounds lighter, so this should reduce the time we draw higher current under acceleration due to the lighter weight....right?