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electrical:12v:b2b [2020/03/23 13:13] frater_secessus [Renogy] |
electrical:12v:b2b [2020/06/23 12:20] frater_secessus |
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===== CTEK D250 series ===== | ===== sizing ===== |
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| DC-DC chargers come in different ratings (10A, 40A, 60A, etc) which increase significantly in price as the rating increases. |
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| Different battery types accept current at different rates. Assuming a 100Ah battery: |
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| * Flooded lead-acid accepts a maximum of about [[electrical:12v:battery_capacity|C]]/5, or 20A and requires a minimum of C/10 (10A). In this case, **10-20A of charging capacity would be appropriate**. Less than 10A would be insufficient and more than 20A would be wasted expense. |
| * AGM lead-acid accepts a max of about C/3, or 33A per 100A of battery capacity, and requires a minimum of C/5 (20A). In this case, **20-33A of charging capacity would be appropriate**. Less than 20A would be insufficient and more than 33A would be wasted expense. |
| * Lithium has very low internal resistance, and may be able to slurp up all the alternator has to give. However, there are reasons not to max out charging capacity: |
| * added expense |
| * lithium does not care about [[electrical:12v:psoc|partial states of charge]] |
| * lithium tends to last longest with gentler charging/discharging |
| * the alternator will be happier with lighter loading |
| For these reasons, an appropriate charging capacity would be **as small as possible while still meeting your power needs**. |
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| ===== common examples ===== |
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| ==== CTEK D250 series ==== |
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The most common b2b charger with 'dwellers is the [[https://amzn.to/2RY2GNQ|CTEK D250SA]], a 20A solar/alt controller. It has connections for both alternator and solar panel input + MPPT function, although the MPPT algo may not be partcularly robust. | The most common b2b charger with 'dwellers is the [[https://amzn.to/2RY2GNQ|CTEK D250SA]], a 20A solar/alt controller. It has connections for both alternator and solar panel input + MPPT function, although the MPPT algo may not be partcularly robust. |
Note: the CTEK D250SA((and the pre-2018 D250**S** model)) panel voltage (Vpanel) maximum is 23v.((https://www.ctek.com/storage/ma/b21ecd5d5e5943a995474cf36d586451/956c3913c8cc4319bb4e47baea0c6d82/pdf/A78BBB08A9DF8976DB79E21271E091489ACEF47A/D250SA-manual-UK-EN.pdf, pdf)) There are user reports that the unit is [[https://www.4x4community.co.za/forum/showthread.php/322874-CTEK-D250S-Problem?s=a2bc518379e50466c9ec523e8b114053&p=4270868#post4270868|repairable after overvoltage or polarity damage]]. It requires >= 80w of solar for reliable solar charging.(())(()) [[https://duckduckgo.com/?q=ctek+mppt+problems&ia=web|There are anecdotes that the MPPT algorithm is not particularly robust]] and is better thought of as an add-on for the alternator charging circuit.((https://expeditionportal.com/forum/threads/ctek-250s-poor-solar-performance.198052/)) | Note: the CTEK D250SA((and the pre-2018 D250**S** model)) panel voltage (Vpanel) maximum is 23v.((https://www.ctek.com/storage/ma/b21ecd5d5e5943a995474cf36d586451/956c3913c8cc4319bb4e47baea0c6d82/pdf/A78BBB08A9DF8976DB79E21271E091489ACEF47A/D250SA-manual-UK-EN.pdf, pdf)) There are user reports that the unit is [[https://www.4x4community.co.za/forum/showthread.php/322874-CTEK-D250S-Problem?s=a2bc518379e50466c9ec523e8b114053&p=4270868#post4270868|repairable after overvoltage or polarity damage]]. It requires >= 80w of solar for reliable solar charging.(())(()) [[https://duckduckgo.com/?q=ctek+mppt+problems&ia=web|There are anecdotes that the MPPT algorithm is not particularly robust]] and is better thought of as an add-on for the alternator charging circuit.((https://expeditionportal.com/forum/threads/ctek-250s-poor-solar-performance.198052/)) |
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===== Sterling ===== | ==== Sterling ==== |
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[[https://amzn.to/2SkqVXq|{{https://images-na.ssl-images-amazon.com/images/I/41iC+8sIvJL._AC_US218_.jpg }}]] | [[https://amzn.to/2SkqVXq|{{https://images-na.ssl-images-amazon.com/images/I/41iC+8sIvJL._AC_US218_.jpg }}]] |
The Sterling Pro Batt Ultra series is alternator-charging only, but can be configured to exact [[electrical:solar:charge_controller_setpoints|setpoints]]. The BB1260-12 is a 30A example and costs about $50 more than the D250S above. | The Sterling Pro Batt Ultra series is alternator-charging only, but can be configured to exact [[electrical:solar:charge_controller_setpoints|setpoints]]. The BB1260-12 is a 30A example and costs about $50 more than the D250S above. |
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===== Renogy ===== | ==== Renogy ==== |
relays | relays |
[[https://amzn.to/33HJ8ns|{{ https://images-na.ssl-images-amazon.com/images/I/51Hu4-7NxOL._AC_UL160_SR160,160_.jpg}}]] | [[https://amzn.to/33HJ8ns|{{ https://images-na.ssl-images-amazon.com/images/I/51Hu4-7NxOL._AC_UL160_SR160,160_.jpg}}]] |
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===== Redarc ===== | ==== Redarc ==== |
[[https://amzn.to/2VgTre7|{{ https://images-na.ssl-images-amazon.com/images/I/417F858GCdL._AC_US218_.jpg}}]] | [[https://amzn.to/2VgTre7|{{ https://images-na.ssl-images-amazon.com/images/I/417F858GCdL._AC_US218_.jpg}}]] |
Redarc makes [[https://amzn.to/2VgTre7|a 25A b2b charge with MPPT]] similar to the CTEK. | Redarc makes [[https://amzn.to/2VgTre7|a 25A b2b charge with MPPT]] similar to the CTEK. |
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===== Ring Automotive ===== | ==== Ring Automotive ==== |
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Ring makes [[https://www.ringautomotive.com/en/product/RSCDC30|a 30A DC-DC charger]]. | Ring makes [[https://www.ringautomotive.com/en/product/RSCDC30|a 30A DC-DC charger]]. |