Since you didn't specify if that 1300W is Peak or RMS, or at what impedence(ohms),I'm going to assume that the 1300W is a Peak rating. This means that(more than likely) the RMS rating will be around 650W. I'm also going to assume that is at 4 ohms.If you intend to run these subs in parallel, you will need an amp capable of supplying AT LEAST 1300W RMS into a 2 ohm load.If you intend to run these subs in series, you will need an amp capable of supplying AT LEAST 1300W RMS into an 8 ohm load.Also,my basic rule of thumb is that your amp should be about 1/3 more powerful than your sub(s) require. So, you should actually be looking for an amp in the 1800W range.You should be able to find an amp to match these requirements fairly easily, there are quite a number of amps out there that well exceed 1800W @ 2 ohms.I'm not saying that they come cheaply - be prepared for prices in at least the $900-$1000 range. :-(
Frequency doesn't come into it for normal electrical devices, as long as the voltage matches it will be fine. 50/60hz differences only really affect display equipment.
you need about a 600-800 watt 2 om class d amp that will maximise the power of your sub
Scroll down to related links and read "Why there is no such thing as 'RMS watts' or 'watts RMS' and never has been".
My 5500W generator lasted for 16 hours on 7 gallons of fuel. It held up all of ourelectricity, appliances including tv and other electrical devices. Our 2600 watt held up for 5 hours but we only used it on about half load (1300W) so it really depends on the wattage and how well you take care of it. Make sure to change the oil at about every 25 hours of use. They run until you run out of gas. Make sure you have ample amount stored just in case. Do not run the generator for a good part of the day just to give it a break; plus the light outside should suffice.