barrett2418
1 µW
- Joined
- Feb 25, 2013
- Messages
- 3
Hey everyone,
Problem stated in fewer words at bottom of post for those who prefer short and simple
I am new to the forum and love what you are doing here. I have been playing with electronics for a while and have a fairly good understanding about DC current. But in here it would probably be called less than basic. I have converted mini bikes to electric. One with a 36 volt variable throttle for rear wheel and a 24 volt variable throttle on the front wheel. 2 is TWICE the fun! Also built a bigger verson with a 48 volt but on a more off road friendly application, Off road chopper. Recently been modifying power wheels for my little boy and nephew. Most power wheels are really easy they run straight off volts, more volts more rpms. Took a 6 volt to 18v, and now will do wheelies, and just finished putting turbo twist grips on on 2 other for wheelers. both 12V to 18v using a relay, so on demand.
All these applications were using heavy lead acid batteries, Price permitting i may switch bikes over to LiFePo4. But my main reason posting is that i am still reading and learning about the capabilities and limitations of these batteries, but need to make a decision now about using one in a different application. I have been building and Racing jet skis for years. I am in the process of a turbo conversion and am working on the harness now. The particular motor I am using pulls a lot of electrical power. The charging system (like alternator) is a magneto coil that connects to a rectifier regulator. There is absolutely no extra power for add ons like fans, sensors ect. Even known to pull from battery while running at times. I want to use an extra battery to power some of the simple add ons to reduce load on oem system. Weight is a factor for me as well as safety.
My original Idea was to have the LiFePo4 in the front powering extras and the lead acid in the rear to provide cranking amps for the big 1812cc engine. My thought (before research) was to connect the batteries in parallel with manual switches in between so that in the event the engine battery dies i can flip the switch and have the LiFePo4 battery jump the lead acid. also be able to charge the LiFePo4 if need be with accessories off.
After reading does not seem i can charge the LiFePo4 with the stock system I beleive i would need an adaptor of some sort to change current or charge rate.
I have also read, from my understanding that it is not good to connect lead acid and LiFePo4 together for multiple reasons including difference in current, discharge rate, ect like a parasitic effect.
But what I need to know and can't seem to find an example that suits my application, is What are the effects of connecting the batteries is parralell but disconnected and then only connect them for a jump start then dissconnect.
Basically can you Jump a vehicle with a lead acid battery using a LiFePo4 battery with out causing damage to either batteries or systems they are attached to?
Thank you very much, Barrett
Problem stated in fewer words at bottom of post for those who prefer short and simple
I am new to the forum and love what you are doing here. I have been playing with electronics for a while and have a fairly good understanding about DC current. But in here it would probably be called less than basic. I have converted mini bikes to electric. One with a 36 volt variable throttle for rear wheel and a 24 volt variable throttle on the front wheel. 2 is TWICE the fun! Also built a bigger verson with a 48 volt but on a more off road friendly application, Off road chopper. Recently been modifying power wheels for my little boy and nephew. Most power wheels are really easy they run straight off volts, more volts more rpms. Took a 6 volt to 18v, and now will do wheelies, and just finished putting turbo twist grips on on 2 other for wheelers. both 12V to 18v using a relay, so on demand.
All these applications were using heavy lead acid batteries, Price permitting i may switch bikes over to LiFePo4. But my main reason posting is that i am still reading and learning about the capabilities and limitations of these batteries, but need to make a decision now about using one in a different application. I have been building and Racing jet skis for years. I am in the process of a turbo conversion and am working on the harness now. The particular motor I am using pulls a lot of electrical power. The charging system (like alternator) is a magneto coil that connects to a rectifier regulator. There is absolutely no extra power for add ons like fans, sensors ect. Even known to pull from battery while running at times. I want to use an extra battery to power some of the simple add ons to reduce load on oem system. Weight is a factor for me as well as safety.
My original Idea was to have the LiFePo4 in the front powering extras and the lead acid in the rear to provide cranking amps for the big 1812cc engine. My thought (before research) was to connect the batteries in parallel with manual switches in between so that in the event the engine battery dies i can flip the switch and have the LiFePo4 battery jump the lead acid. also be able to charge the LiFePo4 if need be with accessories off.
After reading does not seem i can charge the LiFePo4 with the stock system I beleive i would need an adaptor of some sort to change current or charge rate.
I have also read, from my understanding that it is not good to connect lead acid and LiFePo4 together for multiple reasons including difference in current, discharge rate, ect like a parasitic effect.
But what I need to know and can't seem to find an example that suits my application, is What are the effects of connecting the batteries is parralell but disconnected and then only connect them for a jump start then dissconnect.
Basically can you Jump a vehicle with a lead acid battery using a LiFePo4 battery with out causing damage to either batteries or systems they are attached to?
Thank you very much, Barrett
