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electrical:12v:b2b [2020/01/15 13:12]
frater_secessus [CTEK D250 series] |
electrical:12v:b2b [2020/03/23 12:51]
frater_secessus [Renogy] |
| 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. |
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| The [[https://amzn.to/2TozjWu|SmartPass accessory]] bypasses the D250SA when the house battery wants > 20A of current. This will generally happen in the first half of Bulk mode. When the house battery demand drops below 20A control is handed back to the D250SA for boosting to Absorption voltage.((https://www.4x4community.co.za/forum/showthread.php/292297-Ctek-250-upgrade-to-smartpass?p=3823781#post3823781))\\ | The [[https://amzn.to/2TozjWu|SmartPass accessory]] adds 80A of alternator-voltage charging when Vbatt is low enough that the alternator can still charge it directly. This combined charging((up to 100A)) will happen in the first half of Bulk mode. As house battery voltage rises to normal alternator voltage the smartpass can no longer contribute. At that point the 20A D250SA continues voltage-boosted charging to Absorption voltage.((https://www.4x4community.co.za/forum/showthread.php/292297-Ctek-250-upgrade-to-smartpass?p=3823781#post3823781))\\ |
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| 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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| ===== Renogy ===== | ===== Renogy ===== |
| [[https://amzn.to/33HJ8ns|{{ https://images-na.ssl-images-amazon.com/images/I/51Hu4-7NxOL._AC_UL160_SR160,160_.jpg}}]]Renogy makes b2b chargers in [[https://amzn.to/2NGIP6U|20A]] and [[https://amzn.to/33HJ8ns|40A versions]]. A [[https://amzn.to/2QYuswm|50A model with MPPT charging]] is also available. | relays |
| | [[https://amzn.to/33HJ8ns|{{ https://images-na.ssl-images-amazon.com/images/I/51Hu4-7NxOL._AC_UL160_SR160,160_.jpg}}]] \\ |
| | * DC1212 series DC-DC isolators in 20-40((and possibly 60A according to manual nomenclature)) output. Switched on by ignition circuit on the D+ port.((https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf)) DIP switches for battery type. [[https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf|manual]] (pdf) |
| | * DCC-series of voltage sensing b2b chargers in [[https://amzn.to/2NGIP6U|20A]] and [[https://amzn.to/33HJ8ns|40A versions]]. |
| | * DCC50S [[https://amzn.to/2QYuswm|50A model with MPPT charging]] is also available. [[https://www.renogy.com/content/RBC50D1S-G1/RBC50D1S-G1-Manual.pdf|manual]] (pdf) |
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| This charger has preset profiles for battery types. | |
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