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electrical:12v:b2b [2024/02/20 13:18] frater_secessus [Kisae] |
electrical:12v:b2b [2024/04/12 21:40] frater_secessus [Kisae] |
The DC-DC should be big enough to meet your charging targets given the amount of driving you do and the | The DC-DC should be big enough to meet your charging targets given the amount of driving you do and the |
contributions of [[electrical:12v:alt_and_solar|other forms of charging]]. It should be small enough that the [[electrical:12v:alternator_details#current|alternator can provide the power continuously]].((Some DC-DC can be derated in the settings in 5A or 10A increments. IOW, you might run your 50A DC-DC at 35A after observing how the system operates.)) **An oversized DC-DC charger cannot protect the alternator**. | contributions of [[electrical:12v:alt_and_solar|other forms of charging]]. It should be small enough that the [[electrical:12v:alternator_details#current|alternator can provide the power continuously]].((Some DC-DC can be derated in the settings in 5A or 10A increments. IOW, you might run your 50A DC-DC at 35A after observing how the system operates.)) **An oversized DC-DC charger cannot protect the alternator**. |
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| ==== harvest ==== |
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| Ah = Amps x hours. If your DC-DC charges at 20A and you drive for 2.5 hours it can replace 50Ah (20A x 2.5 hours). |
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Note that [[opinion:frater_secessus:charging_faster|bigger is not always better]]; different battery chemistries and capacities accept current at different rates. Buying more charging capacity than the battery wants((or should have for its own good, see Li below)) is a waste of money. Buying more charging capacity than your alternator can deliver constantly can overheat/damage the alternator. | Note that [[opinion:frater_secessus:charging_faster|bigger is not always better]]; different battery chemistries and capacities accept current at different rates. Buying more charging capacity than the battery wants((or should have for its own good, see Li below)) is a waste of money. Buying more charging capacity than your alternator can deliver constantly can overheat/damage the alternator. |
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This unit also seems to be sold under the Ring and Merlin brands. | This unit also seems to be sold under the Ring and Merlin brands. |
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| ==== Redodo ==== |
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| {{ https://m.media-amazon.com/images/I/71PVPwKPJxL._AC_UL320_.jpg?100}} |
| Redodo makes [[https://amzn.to/3JhGtqN|a 40A combo DC-DC/MPPT]]: |
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| * Pv input 13.0v - 26v, max 600w |
| * Alternator Input Voltage 11.3-24VDC, max 600w |
| * Smart Alternator Input Voltage 12-24VDC , max 600w |
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| No manual located as of this writing. |
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| === solar+alternator behavior === |
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| unknown |
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| === starter battery maintenance behavior === |
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| Amazon listing claims "supports reverse charging the starter battery through the service battery". A seller answer later says: |
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| > When the starter battery voltage is between 3 to 12V and the service battery voltage is >12.5V, press and hold the “Reverse Charging” for 3 seconds to initiate reverse charging. It’s recommended to exit reverse charging when the starter battery voltage >13V and charging current <10A, or when the service battery voltage <11V. |
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==== SRNE ==== | ==== SRNE ==== |
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| ==== Adventure King ==== |
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| {{ https://i.ebayimg.com/images/g/G9QAAOSw7T5kkmoj/s-l1600.jpg?100}} |
| AK makes [[https://nz.adventurekings.com/lighting-power/dc-to-dc-chargers/kings-25a-dcdc-charger.html|a 25A combo unit]] with a |
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| * 9v-25v PV input limit.((AKEP-DC25A_01 - 25A DC-DC/MPPT Charger)) |
| * alternator input 11.9v-25V. Appears to connect at 12.1v (IGN) or 13.8v (voltage sensing) |
| * manual says for lead batts only, but the "Wet Lead Acid/GEL" profile charges at 14.2v and floats at 13.3V. Temp compensation seems to be mandatory((encase it in styrofoam?)) |
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| [[https://marketing.4wdsupacentre.com.au/%20manuals/191024%2012V%20DC-DC%20Battery%20Charger%20User%20Manual_V1.6.pdf|manual]] |
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| === solar+alternator behavior === |
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| no information available |
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| === starter battery maintenance behavior === |
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| no information available |
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==== CTEK D250 series ==== | ==== CTEK D250 series ==== |
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DC-DC chargers in 20A, 40A, and 60A output. Switched on by ignition circuit on the D+ port, low output mode (12.5% of rated current) triggered by 12v on a dedicated terminal. ((https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf)) DIP switches for battery type, Vabs and Vfloat. [[https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf|manual]] (pdf) [[https://diysolarforum.com/threads/renogy-dcc1212-dc-dc-charger-teardown.10141/|teardown]] Note: some versions of the manual [[https://www.reddit.com/r/vandwellers/comments/okfkuk/my_batteries_inverter_and_dcdc_charger_came_in_i/h5899bw/|may have a typo]]. | DC-DC chargers in 20A, 40A, and 60A output. Switched on by ignition circuit on the D+ port, low output mode (50% of rated current) triggered by 12v on a dedicated terminal. ((https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf)) DIP switches for battery type, Vabs and Vfloat. [[https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf|manual]] (pdf) [[https://diysolarforum.com/threads/renogy-dcc1212-dc-dc-charger-teardown.10141/|teardown]] Note: some versions of the manual [[https://www.reddit.com/r/vandwellers/comments/okfkuk/my_batteries_inverter_and_dcdc_charger_came_in_i/h5899bw/|may have a typo]]. |
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These chargers appear to have a 3 hour absorption duration. This is usually insufficient for lead chemistries, but still longer than the 2 hour duration of the DCC series above. From the manual: | These chargers appear to have a 3 hour absorption duration. This is usually insufficient for lead chemistries, but still longer than the 2 hour duration of the DCC series above. From the manual: |
[[https://amzn.to/3entDrt|{{ https://m.media-amazon.com/images/I/51FNDAIhJeS._AC_UY218_.jpg?125}}]] | [[https://amzn.to/3entDrt|{{ https://m.media-amazon.com/images/I/51FNDAIhJeS._AC_UY218_.jpg?125}}]] |
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Victron makes several DC-DC chargers, some of which are configurable by bluetooth. 12v examples: | Victron makes several DC-DC chargers, some of which are configurable by bluetooth ("Smart" units). |
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| === Orion-Tr === |
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| 12v examples: |
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* Orion-Tr 12|12-20 20A | * Orion-Tr 12|12-20 20A |
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[[https://www.youtube.com/watch?v=ICYTJhx2AsI|This YT video]] covers Orion configuration in considerable detail. | [[https://www.youtube.com/watch?v=ICYTJhx2AsI|This YT video]] covers Orion configuration in considerable detail. |
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| === OrionXS === |
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| Differences from the -Tr: |
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| * 50A |
| * all models have BT |
| * non-isolated only |
| * adds support for "VE.Smart" networking to receive voltage, temperature and current information from [[https://amzn.to/3TMRYga|BMV]] or [[https://amzn.to/498FnIr|SmartShunt]] (voltage and temp only from a [[https://amzn.to/4aoACf1|Smart BatterySense]] since it has no shunt). |
| * supports low-temp charging disconnect as sensed by one of the above sensors |
| * 4awg terminals |
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| [[https://www.victronenergy.com/upload/documents/Datasheet-Orion-XS-12-12-50A-DC-DC-battery-charger-EN.pdf| data sheet]] (pdf) |
==== Bogart ==== | ==== Bogart ==== |
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