The Renogy DCC50S is potentially a great product with a high charge rate from both vehicle and solar and good protection features and all at a very reasonable price - if only it worked properly from the vehicle alternator! This thing is great on Solar but its a bit problematic as far as car charging and not as good as it could be. Dont get me wrong its a good quality unit but should be so much better on alternator charging. Watch this and I show its short comings.

Good general technical appraisal of this product from Will Prowse at DIY Solar Power:
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Renogy DC/DC Charger information can be found here:

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Purchased from Amazon but you can buy direct:
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