8.4Recharging with a Generator’s 12-Volt DC Power Outlet
Recharging Portable Power 250 from a generator using theAC Charger is possible, but would require extended generator running time. Since many generators have an auxiliary regulated 12-volt DC output designed for charging 12-volt batteries, using this power source will result in much faster charging. If the generator has a cigarette lighter style socket for its 12-volt output, follow the connection instructions in Section 8.3.
Most of Portable Power 250’s capacity will be recharged in about 1 to 3 hours. The charge level can be verified using Portable Power 250’s Battery Level Indicator after disconnecting from the charging source as explained in Section 4.1.
CAUTION: The generator output must be intended for 
battery charging. An unregulated output or one that
exceeds 15 volts DC can damage the battery.
8.5Recharging with a Solar Panel
Small unregulated 12-volt solar panels rated to produce a maximum of 3 amps (or 40 watts) can be used to charge Portable Power 250 via the Charger Input Socket. You will need to purchase a standard 5.5 mm OD x 2.5 mm ID “DC Coaxial (Barrel Type) Connector” to mate with the Charger Input Socket. Connect the solar panel’s positive (red) wire to the coaxial plug’s inner contact and the solar panel’s negative (black) wire to the plug’s outer contact. Once the connector is inserted into the Charger Input Socket and the solar panel is placed in the sun, Portable Power 250 will charge automatically just as with theAC Charger. (See Section 8.2.) A 3-amp solar panel will charge Portable Power 250 in about 8 hours in direct sunlight.