HammaMan
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I've replaced my aux batt under the rear seat with a 100ah lithium iron phosphate. This batt is in parallel with the under-hood AGM. The LFP batt has a BMS on it that allows for live power flow (bi-directional) down to 1 watt of resolution. I will record data to the best of my ability. This post will be updated with quite a bit of information including....
- Power usage upon vehicle shutoff w/ 20 second and 120s headlight run
- Power used when a lock / unlock command is sent via app
- Power used when approach lighting is activated
- Overnight / 24hr sitting
- and..... what conditions outside of those should be included?
My truck is a powerboost, but the usage data should be relevant for the behavior of most trucks as it's not unique to the powerboost.
Interesting points about this arrangement -- The charged LFP batt's resting voltage based on the parameters I've programmed into the BMS is 13.4v. This is a float voltage for the AGM so it doesn't take any energy unless its not charged to begin with. The LFP batt will charge like a beast, up to 90a, very fast. The powerboost will put up to 15.2v on the 12v system to charge the batts and put out 220a at idle using its DC/DC converter. Once the LFP is 'full' per my settings, the BMS cuts off current inflow while allowing current to exit due to the manner in which the mosfets work. They work similar in practice to a diode, without the additional loss. I've done this because AGMs don't charge for shit on the top of their curve whereas the LFP will eat loads of current until it's ~85% full. This 'little' LFP batt has more reserve / usable energy than both of the truck's factory batteries. About twice as much in-fact.
The post will be updated, anything you'd like to see tested?
--Energy 'costs'--
(total energy used from no load on BMS, to denoted action, and back to no load)
1.31ah - Key off w/ 120 seconds of headlights on (approach truck, welcome lights on, unlock door, hit key on accessory, key off immediately, walk away and lock door)
1ah on the nose - Approach w/ welcome lighting enabled, open door for 2 minutes w/ running board deployed, close door walking away, 10 seconds later push lock button
.45 ah -- Approach close enough to trigger welcome lighting
.40 ah --12hrs overnight with no user 'inputs' or 'wakeups'
.14 ah --Fordpass app remote lock command via cell
.13 ah -- Without approaching truck, push lock button on FOB (truck was locked). This is something you'd do to confirm you've locked the vehicle
- Power usage upon vehicle shutoff w/ 20 second and 120s headlight run
- Power used when a lock / unlock command is sent via app
- Power used when approach lighting is activated
- Overnight / 24hr sitting
- and..... what conditions outside of those should be included?
My truck is a powerboost, but the usage data should be relevant for the behavior of most trucks as it's not unique to the powerboost.
Interesting points about this arrangement -- The charged LFP batt's resting voltage based on the parameters I've programmed into the BMS is 13.4v. This is a float voltage for the AGM so it doesn't take any energy unless its not charged to begin with. The LFP batt will charge like a beast, up to 90a, very fast. The powerboost will put up to 15.2v on the 12v system to charge the batts and put out 220a at idle using its DC/DC converter. Once the LFP is 'full' per my settings, the BMS cuts off current inflow while allowing current to exit due to the manner in which the mosfets work. They work similar in practice to a diode, without the additional loss. I've done this because AGMs don't charge for shit on the top of their curve whereas the LFP will eat loads of current until it's ~85% full. This 'little' LFP batt has more reserve / usable energy than both of the truck's factory batteries. About twice as much in-fact.
The post will be updated, anything you'd like to see tested?
--Energy 'costs'--
(total energy used from no load on BMS, to denoted action, and back to no load)
1.31ah - Key off w/ 120 seconds of headlights on (approach truck, welcome lights on, unlock door, hit key on accessory, key off immediately, walk away and lock door)
1ah on the nose - Approach w/ welcome lighting enabled, open door for 2 minutes w/ running board deployed, close door walking away, 10 seconds later push lock button
.45 ah -- Approach close enough to trigger welcome lighting
.40 ah --12hrs overnight with no user 'inputs' or 'wakeups'
.14 ah --Fordpass app remote lock command via cell
.13 ah -- Without approaching truck, push lock button on FOB (truck was locked). This is something you'd do to confirm you've locked the vehicle
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