This is not mutually exclusive – for example, if there is no solar coming in, then it can pass up to 50A from the alternator. There has been some confusion on the specs, so we confirmed with Renogy. It can function with up to 660W of solar panels (that’s a lot!), and any vehicle alternator. The solar and alternator capabilities of the DCC50S have standard specs that match those from any stand-alone equipment. It will even trickle charge your vehicle battery once it senses your house (solar) battery is full. If designing our system today, we’d definitely buy the Renogy DCC50S. Traditionally the charge controller and B2B charger were two separate pieces of equipment. What’s cool is it’s a combo Solar Charge Controller and DC to DC Vehicle Alternator Charger. This thing wasn’t out yet when we designed our electrical system in 2018.
We’re excited by the new DCC50S Charge Controller MPPT from Renogy. But you do need to be near an outlet (no boondocking). Shore Power: Plug in to an outlet to charge your batteries! No sun or driving necessary.Depending where you are for the winter, they might happen a lot. Solar panels are trying to generate energy all day, while the alternator only works when the engine is on. Compared to solar panels, it’s pretty limited. A 15-minute drive isn’t going to be much energy. Alternator:The vehicle needs to be running for quite a while to get a meaningful charge from the alternator.You will also need to consider all the potential issues with the three main charging options: A budget setup for off-grid electricity could be just a battery to battery charger and a 12V battery. If you drive a lot and don’t consume a lot of electricity. Depending on your usage, you might actually be able to skip solar panels altogether.If you solar panels can’t keep up with your demand, the alternator can make up the slack. Simply, for battery health you want to charge your battery to 100%. Alternator charging can increase the lifespan of your battery.You’re going to have a charge controller anyways, and the combo devices are only a bit more expensive.
If you’re designing a new electrical system, we definitely recommend charging from the alternator. Combination charge controller & alternator chargers (like the Renogy one we recommend here) are now available.
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