Ok just so you guys know, if the person had a 400Ah lithium battery pack in the back of his ute which would only weight 36kg, he could run a 3000w inverter all day charging all his gear as he worked or drove. When he got home he would just have to hook up the Lithium battery to a 40amp charger and it would be charged the next morning. If he really wanted to be green then he could have 1000Ah of lithium at home with 20000watts of solar on roof and his whole house woild be run by solar and all his recharging would also be done by solar.
If you are willing to learn and spend the money to get setup then I cant see it being a problem to run all elcectrical. They would need a few backup batteries for each machine. I have used some cordless machinary and have been very impressed by the weight and power, if I was going to get back into the business again, I would have a electric hedger, whipper snipper, blower and would look at electric mower for those little easy jobs, would still have a petrol SP mower for the big jobs.