![]() ![]() ![]() So, your solar panel will push power into the circuit, and you will pull power off that circuit for the laptop, then the remainder will deliver to the battery.Īssume your laptop has a 120W power-supply, this means at standard U.S. What is effectively happening, is you won't actually draw load off of the battery most-likely, because the cigarette lighters are usually part of the same circuit. ![]() So here's where your scenario starts to fall apart, in my opinion: why are you trying to charge through one port, and draw through another? Why not just use a solar panel and converter that delivery 120V for your laptop directly? Are you trying to use the laptop when there is no sun?īut, your question, would it cause problems with the vehicles electronics? Possibly. (This is often the case with old vehicles.)Īdditionally, would running loads (Ex: laptop or 12v fan) from another cigarette outlet create problems with the power going into the battery or potentially cause problems with the vehicle's electronics? These are spring connectors with low connection quality, sometimes the inside of the port will even be corroded which would mean you have to twist-and-mess-with the connector. On top of these issues, there is a lot of inherent resistance in a cigarette lighter port, the cabling, and the connectors. That means that even at max capacity, your solar panel would take 4.8 hours to charge the car battery, assuming nothing failed before then. Generally, a car battery has 48-or-so amp-hours (AH). Car batteries are rated in CCA / Cold Cranking Amps, which is the amperage it can deliver at 0☏ for 30 seconds, while maintaining a voltage of at least 7.2V. However, 10A at 12V is a very small amount of energy (120W). Yes, some are tied to ignition, some are not, the shop will use a permanent-power port for this, so they avoid that problem altogether. When a shop needs to change your battery, they plug one of these into a cigarette lighter port, then take the battery out. Generally speaking, cigarette lighter ports are bi-directional, that's how memory keepers work. If charging were limited to less than 10 amps, would solar panel -> charge controller -> cigarette lighter outlet work for charging a car battery. My vehicle's cigarette lighter outlet is limited to 10 amps output. There's a lot in your question, so let's look at it in parts: I run such a setup myself in my micro campervan with a 120W panel and a MPTT charge controlelr to keep food and drinks cool. You can also connect a (fused!) pair of wires from the battery to a place where it is convenient to connect the charge controller with a high current connector, e.g. The best solution is still to connect the charge controller directly to the battery, because the voltage drop on the long cables to the battery can cause the controller to stop charging early.Also an additional either in the connector or in the line to the connector is a good idea. Use a good quality cigarette connector rated for the current.Limit the charge current to the fused current of your outlet.If the charge controller provides a switched output with battery under-voltage protection, it may be worth to connect the additional loads on there. you're charge controller delivers 5A and you add a fan pulling 2A, the charging current into the battery is only 3A. This protects the battery and the cars electronics.Īdding another load should be no problem, there is just less current charging to battery. Make sure to connect the solar panel through a charge controller configured for the chemistry of you car battery, so the charging will stop as soon as the battery is full. ![]() If the outlet is directly connected to the battery then it should be possible. ![]()
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