Jebiruph
Well-Known Member
- Thread starter
- #1
I have observed that there may be a need for some basic ESS based electrical theory. For those that struggle to understand how electricity works, some basic electrical concepts can be better understood by using basic plumbing concepts. Substituting water for electricity, pipes for wire and water pressure for electrical voltage may make it easier to understand some of how the ESS batteries work.
To that end, I have redrawn my ESS Battery Diagram as a plumbing diagram to help illustrate how the system works. I represent the batteries as tanks to store water under pressure, the alternator is a pressure pump and the starter is a turbine. I use various intensities of blue to represent the levels of pressure in the system.
This is the normal start diagram (not from an auto stop) with fully charged batteries. Both batteries are providing pressure to the system, so both batteries are providing power to the starter. Even if ESS is disabled, the batteries are still both connected to the system and both provide power to the starter.
This is the engine running diagram with the alternator providing power to the system. As long as the pressure from the alternator is greater than the pressure in the batteries, the batteries will pressurize to their limit and will not discharge.
This diagram shows a bad Aux battery that won't fully charge. The engine is off, so no alternator pressure. The higher pressure of the fully charged main battery will be discharging into the lower pressure of the bad Aux battery until the pressure equalizes, which over time reuslts in 2 dead batteries.
Here's 2 dead batteries on the verge of being jump started with a booster pack. Virtually no pressure in the system at all.
Here's trying to start with the booster connected to the discharged system. The pressure from the booster is distributed throughout the system and there is not enough pressure available at the starter to start. As the pressure accumulates in the batteries, more pressure then becomes available for the starter. If the booster is too small, it will not be able to pressurize the whole system to the point where it will be able to power the starter.
Let me know if you have any questions or comments.
(updated 04/13/2019)
Additional 3.6L ESS system information is available here.
3.6L ESS Dual Battery Consolidated Information
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.2
To that end, I have redrawn my ESS Battery Diagram as a plumbing diagram to help illustrate how the system works. I represent the batteries as tanks to store water under pressure, the alternator is a pressure pump and the starter is a turbine. I use various intensities of blue to represent the levels of pressure in the system.
This is the normal start diagram (not from an auto stop) with fully charged batteries. Both batteries are providing pressure to the system, so both batteries are providing power to the starter. Even if ESS is disabled, the batteries are still both connected to the system and both provide power to the starter.
This is the engine running diagram with the alternator providing power to the system. As long as the pressure from the alternator is greater than the pressure in the batteries, the batteries will pressurize to their limit and will not discharge.
This diagram shows a bad Aux battery that won't fully charge. The engine is off, so no alternator pressure. The higher pressure of the fully charged main battery will be discharging into the lower pressure of the bad Aux battery until the pressure equalizes, which over time reuslts in 2 dead batteries.
Here's 2 dead batteries on the verge of being jump started with a booster pack. Virtually no pressure in the system at all.
Here's trying to start with the booster connected to the discharged system. The pressure from the booster is distributed throughout the system and there is not enough pressure available at the starter to start. As the pressure accumulates in the batteries, more pressure then becomes available for the starter. If the booster is too small, it will not be able to pressurize the whole system to the point where it will be able to power the starter.
Let me know if you have any questions or comments.
(updated 04/13/2019)
Additional 3.6L ESS system information is available here.
3.6L ESS Dual Battery Consolidated Information
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.2
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