We often get asked about the best way to charge a battery with an SGS generator. We've put together this quick guide to help explain how best to use your generator for charging, as well as to explain what your 12-volt output is for.
Important: Although many of our generators have a 12-volt output on them, our generators are not designed to charge batteries directly because,
- The SPG generators have a 8.3amp (maximum) output so your battery will take a long time to charge. The output will usually charge a virtually flat 100 amp hour battery to 40% or so within 6-8 hours.
- The DC output varies according to the generators RPM. The generator won't "cut back" when the battery is nearly full, so you can't risk leaving the battery charging too long.
Bottom line: Your DC output on your generator is best for emergency or short term charging, i.e. providing your car battery a trickle charge. Anything more is a potential risk to your batteries and generator.
The best way to charge a battery with a generator:
Run a proper, purpose built battery charger off one of the generators larger outputs. This will charge the battery faster and more accurately. Most chargers are self regulating so there's less chance of damaging a battery.
Keep the 12-volt output as a back up.