OYMSAE 30W Solar Car Battery Charger Portable 12V Trickle Battery Charger & Maintainer Waterproof Solar Panel for Car Boat Automotive RV

Price: $89.99 - $70.19
(as of Feb 10, 2026 05:09:06 UTC – Details)

Product description

OK 12v solar system charge multiple batteries simultaneously?

Yes, It is ok connect multiple batteries in series and parallel .Keep the combined battery voltage will always at 12v. Either connect two 6v batteries in series or parallel multiple 12v batteries.

When the controller stop charging the battery ?

12v battery ,the controller will stop charging when indicating that the battery is fully charged .When the battery drops to a maintainable level ,the controller will resume charging.

Why test voltage over 20V ?

The 20v is the open-circle voltage of the solar panel ,not the charging voltage .Test voltage ensure that the solar panel system remains connected to the battery .

Overcharge protect my batteries?

The built in controller includes overcharge protection .

Charge Visualization：The indicator lights can help you understand the charging status: the blue light is on (put in the sun), the red light is on (charging), and the green light is on (charging is complete).A short circuit occurs and all three indicators are off
Intelligent Protection：Built-in charging microprocessor, improved charging algorithm, can provide overvoltage protection, overcharge protection, short circuit protection, etc. It can prevent reverse charging and can be safely used for charging and maintenance of 12V batteries
Higher Conversion Rate：The regular convex points of surface distribution are conducive to the secondary propagation of light, absorb the radiant heat of solar energy to a greater extent, and greatly improve the photoelectric conversion efficiency
Widely Used：The included 3-piece SAE cable kit is plug-and-play,it can be used for cars and 12V batteries. Comes with carabiner and suction cup to meet your different installation needs. Suitable for automobiles, RVs, motorcycles, ships,snowmobile，etc
More Durable：The PET material can be waterproof and dustproof. A layer of epoxy board is added as a bottom plate, which is more sturdy (the broken panel will cause the charging efficiency to decrease). You can contact us at any time if you have any questions