That's gonna be all the ps you ever need, that will run 2 duos at a moderate charge rate.
The charger should definetely come on as soon as it gets power, and WITHOUT having a pack connected-hope you can come to a good conclusion with either Hyperion or BPP.
after reading the firmware update process and seeing in BIG RED LETTERS you are SCREWED if the update does not work i would sell my charger and buy a new one before attempting the update.