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--- electrical:12v:self-jumpstarting [2024/02/19 02:39]
frater_secessus [maintaining starter batteries] gotchas
+++ electrical:12v:self-jumpstarting [2024/11/21 00:48] (current)
frater_secessus [DC-DC chargers]
@@ Line 3: / Line 3: @@
 Self-jumpstarting means jumpstarting one's own vehicle without the use of another vehicle.  It's done by [[electrical:12v:alternator|combining]] house and chassis batteries by one of several methods discussed below.
-Note:  regardless of specific method used, it will be gentlest on the system to **combine the batteries and wait a few minutes for the starter battery to come up** instead of immediately attempting to start. This will minimize the amount of current flowing from house bank to vehicle chassis. This may be especially important with Li chemistries that have BMS protections.
+Note:  regardless of specific method used, it will be gentlest on the system to **combine the batteries and wait a few minutes for the starter battery to come up** instead of immediately attempting to start. This will minimize((or eliminate, if the connection is broken prior to starting)) the amount of current flowing from house bank to vehicle chassis. This may be especially important with Li chemistries that have BMS protections.
 ===== jumping from the house bank =====
@@ Line 34: / Line 34: @@
 ==== DC-DC chargers ====
-As with diode-based isolators, DC-DC chargers typically cannot pass power back from the battery bank to the vehicle; there are exceptions.  Read below for workarounds and different approaches.
+As with diode-based isolators, DC-DC chargers typically cannot pass power back from the battery bank to the vehicle.  Read below for workarounds and different approaches.
+Exceptions:
+  * the [[https://battlebornbatteries.com/product/wakespeed-48v-12v-bi-directional-dc-dc-converter/|BattleBorn/Wakespeed 48v/12v Bi-Directional DC-DC  charger]] can send 50% of it's rated power to the starter battery.
+  * the [[https://amzn.to/40WMp2L|Bluetti 800w alternator charger]] (DC-DC) has a starter battery maintenance function.
@@ Line 43: / Line 49: @@
 Note the Smartpass does this when added to the CTEK D250-series chargers.
-===== maintaining starter batteries =====
-Some [[electrical:12v:b2b#examples_-_combo_with_solar_charge_controller|combo DC-DC chargers]] contain logic to maintain the starter battery when solar power is present.
-Some standalone solar charge controllers like the [[https://amzn.to/2PPTD2L|Morningstar SunSaver Duo]] can, for example,  charge the start battery with 10% of solar harvest and the house battery with 90% using different charging profiles.  As with DC-DC above, it's not self-jumpstarting but can help prevent the dead starter battery.
-[[electrical:12v:alternator#voltage-sensing_relays|dVSR isolators]] (including [[electrical:12v:alternator#lithium-specific_vsr|the Li-BIM]]) automatically connect the banks when the voltage on either side reaches the defined setpoing.
-Some Victron Multiplus models have a 4A starter battery maintenance feature.
-There are dedicated maintainers:
-  * Some RVs were equipped with original Trik-L-Start or lithium-compatible Amp-L-Start modules by LSL Products, which is [[http://www.lslproducts.net/|apparently out of business]].
-  * The [[https://amzn.to/47HMMyn|Xantrex echo charge]] maintains the chassis battery at up to 15A.
-Experimental:  RV With Tito has [[https://www.youtube.com/watch?v=exQSsTiclOo|uses a PWM solar charge controller to maintain starter battery from the house bank]].
-Also see [[electrical:12v:alternator#gotchas|the subarticle on combiner gotchas]].
@@ Line 71: / Line 57: @@
 'Dwellers may want to pick a jump pack that has 12v or USB outlets so it can have other uses.
+===== maintaining starter batteries =====
+[this section [[electrical:12v:maintaining_starter_battery|has been moved]]]

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