Battery Box. I have been wanting to add more batteries but due to the style of the 300tq front the typical trailer tongue box would not fit. I was in Harbor Freight the other day and they sell two trailer tongue boxes. The smaller box #66244 for $89 minus what ever discount coupon you might have looked like a good fit.
I had to prepare the battery generator platform with some plywood so the box would have a even surface to sit on.
The box will hold 4, type 24 12 volt batteries. It's a tight fit for the batteries as the space to drop the batteries in is 10" and that is pretty much the size of the 24 12 volt battery. It would be easier if your battery has the handle built into the center of the battery but if it uses a strap that hangs off the ends of the battery you will have to remove the strap and sand off the part that sticks out that the strap went to for it to fit.
I added 2 1/2" vents to the back sides and front. I also added a battery disconnect switch.
I used rubber tool box padding on the bottom and between each battery to cushion the batteries and to prevent scuffing.
I use a ratchet strap as a clamp to hold the batteries in place
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