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electrical:solar:car [2023/09/21 10:25] frater_secessus [$300] |
electrical:solar:car [2024/06/02 13:00] (current) frater_secessus [general principles] |
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====== example setups ====== | ====== example setups ====== | ||
+ | |||
+ | The following DIY setups sketch out what off-grid power systems for cardwellers might look like. These are ideas to compare against your own use case and [[electrical: | ||
+ | |||
+ | ===== general principles ===== | ||
+ | |||
+ | The [[electrical: | ||
+ | |||
+ | 100w **solar panels** are ~$1/ | ||
+ | |||
+ | Larger battery banks don't just store more energy, they allow higher charging rates from the alternator((or solar, but most cars don't have enough room for that much solar)) without stressing the battery. | ||
===== $800 ===== | ===== $800 ===== | ||
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This is a relatively large setup for a cardweller, but at this point we get to leverage the economies of larger batteries and used panels. | This is a relatively large setup for a cardweller, but at this point we get to leverage the economies of larger batteries and used panels. | ||
- | * 200w [[electrical: | + | * 250w [[electrical: |
* [[electrical: | * [[electrical: | ||
* [[https:// | * [[https:// | ||
* small PSW inverter like [[https:// | * small PSW inverter like [[https:// | ||
+ | |||
+ | Dropping to 50A LFP would decrease cost to ~$510. All numbers below would stay the ~same.((alternator should be limited to 25A charging, so 166Wh instead of 200Wh harvested)) | ||
Actual power harvest would vary depending on the amount of driving (alternator), | Actual power harvest would vary depending on the amount of driving (alternator), | ||
- | | + | |
- | * winter (December) - ~200Wh alternator + 335Wh solar = **535Wh/day** | + | ==== performance ==== |
+ | |||
+ | Solar, conditions described above | ||
+ | |||
+ | | ||
+ | * winter (December) - ~200Wh alternator + 401Wh solar = **602Wh/day** | ||
+ | |||
+ | loads | ||
+ | |||
+ | * DC ~50A (650w)((solar might provided another 213w under optimal conditions, allowing loads up to 663w without exceeding LFP's typical 0.5C sustained discharge spec)) | ||
+ | * AC (inverter) ~40A (520w) | ||
===== $650 ===== | ===== $650 ===== | ||
- | As above, replacing the DC-DC/MPPT combo with separate relay/VSR and 20A MPPT. Solar harvest stays the same, but I'll estimate average alternator harvest [[https:// | + | As above, replacing the DC-DC/MPPT combo with separate relay/VSR and 20A MPPT. Solar harvest stays the same, but I'll estimate average alternator harvest [[https:// |
- | * summer (June) - ~100Wh alternator + 1,186Wh solar = **1,287Wh/day** (1.98Wh/$) | + | * summer (June) - ~130Wh alternator + 1,483Wh solar = **1,613Wh/day** (2.03Wh/$) |
- | * winter (December) - ~100Wh alternator + 335Wh solar = **435Wh/day** | + | * winter (December) - ~130Wh alternator + 401Wh solar = **531Wh/day** |
- | ===== $410 ===== | ||
- | Simplifying with PWM controllers and relays instead of DC-DC. | + | ===== $480 ===== |
- | | + | Simplifying with PWM controllers and relays instead of DC-DC. |
+ | |||
+ | | ||
* combiner or VSR for alternator charging - $50 | * combiner or VSR for alternator charging - $50 | ||
* 2x 100w panel - $200 | * 2x 100w panel - $200 | ||
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* small PSW inverter like [[https:// | * small PSW inverter like [[https:// | ||
- | Same assumptions as the above | ||
- | * summer (June) - ~108Wh alternator + 488Wh solar = **1, | + | ==== performance ==== |
- | * winter (December) - ~108Wh alternator + 284Wh solar = **392Wh/ | + | |
+ | Solar, same assumptions as the above | ||
+ | * summer (June) - ~65Wh alternator + 488Wh solar = **1, | ||
+ | * winter (December) - ~65Wh alternator + 284Wh solar = **349Wh/ | ||
+ | |||
+ | loads | ||
+ | |||
+ | * DC ~25A (325w) | ||
+ | * AC (inverted) ~20A (260w) | ||
===== $300 ===== | ===== $300 ===== | ||
Half the solar brings the cost (and harvest) down: | Half the solar brings the cost (and harvest) down: | ||
- | * 50A LiFePO4 | + | * 50A (640Wh) |
* combiner or VSR for alternator charging - $50 | * combiner or VSR for alternator charging - $50 | ||
* 100w panel - $100 | * 100w panel - $100 | ||
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* small PSW inverter like [[https:// | * small PSW inverter like [[https:// | ||
- | Same assumptions as the above | + | ==== performance ==== |
- | * summer (June) - ~108Wh alternator + 488Wh solar = **596Wh/ | ||
- | * winter (December) - ~108Wh alternator + 142Wh solar = **250Wh/ | ||
+ | Solar, Same assumptions as the above | ||
+ | * summer (June) - ~65Wh alternator + 488Wh solar = **553Wh/ | ||
+ | * winter (December) - ~65Wh alternator + 142Wh solar = **207Wh/ | ||
+ | |||
+ | loads | ||
+ | |||
+ | * DC ~25A (325w) | ||
+ | * AC (inverted) ~20A (260w) | ||
===== $110 ===== | ===== $110 ===== | ||
- | per [[electrical: | + | per [[electrical: |
* 100w panel - $100 | * 100w panel - $100 | ||
* 10A single stage PWM charger - $15 | * 10A single stage PWM charger - $15 | ||
+ | ==== performance ==== | ||
- | Same assumptions as the above | + | Solar, same assumptions as the above |
* summer (June) - 488Wh solar = **488Wh/ | * summer (June) - 488Wh solar = **488Wh/ | ||
* winter (December) - 142Wh solar = **142Wh/ | * winter (December) - 142Wh solar = **142Wh/ | ||
+ | loads | ||
+ | |||
+ | * DC ~10A (130w) | ||
+ | * no AC (inverter) loads | ||