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opinion:frater_secessus:alternatorsolarstall [2020/10/08 17:04] frater_secessus created |
opinion:frater_secessus:alternatorsolarstall [2022/04/09 15:36] (current) frater_secessus [workarounds] ≤, not > |
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Consider the following scenario: | Consider the following scenario: | ||
- | * 100w of panel that charges at 75W | + | |
- | * [[electrical: | + | * [[electrical: |
- | * alternator voltage regulated to 13.8v | + | * alternator voltage regulated to 13.8v |
- | * chassis load on alternator = 125w (lights, radio, vent blower) | + | * [[electrical: |
- | * going for a drive as the sun comes up | + | |
+ | * going for a drive as the sun comes up | ||
Vehicle starts driving and house battery voltage quickly comes up to 13.8v where the alternator wants it. The sun comes up and solar increases power until it is contributing 75w. | Vehicle starts driving and house battery voltage quickly comes up to 13.8v where the alternator wants it. The sun comes up and solar increases power until it is contributing 75w. | ||
- | The alternator senses the voltage trying to rise above 13.8v and so eases back on current until the alternator is contributing only 50w and the solar is powering the chassis loads It doesn' | + | The alternator senses the voltage trying to rise above 13.8v and so eases back on current until the alternator is contributing only 50w and the solar is powering the chassis loads. It doesn' |
If the solar had more than the chassis demand (125w) it would start bringing up system voltage. | If the solar had more than the chassis demand (125w) it would start bringing up system voltage. | ||
+ | |||
+ | ===== workarounds ===== | ||
+ | |||
+ | * use a [[electrical: | ||
+ | * or disconnect isolator using a switch | ||
+ | * or use an HVD on the isolator ≤ alternator voltage | ||