I have a deep cycle marine battery on mine with a 1750 watt inverter.  I can run most anything I want for a few hours.  Mainly using for my onboard fride and maybe some lights or something at some point.  California requires phf’s to be stored in the fridge on your cart, so I equipped my EZ cart with one of the fridge/freezer coolers.   

How much electric do you need on your cart? If you are running DC lights and an on demand DC water pump you can get by with one of those powerpacks they sell in the battery section at Wal-Mart. It’s for emergency power and cost about the same as a good deep cycle battery. The up side is that you recharge it by just plugging into the shore power over night. How much they run (and cost) depends on how big a unit you get. We only run a few 12vDC lights, couple on demand DC water pumps, and a 12vDC fan, so we can use a small unit. Get too much AC stuff and you will need an inverter.
 
Power Packs:
http://www.walmart.com/ip/DieHard-71987-950-Peak-Amps-18AH-Jump-Starter-Portable-DC-USB-Power-Source/15167317 http://www.walmart.com/ip…-Power-Source/15167317
 
http://www.walmart.com/catalog/product.do?product_id=14649556&findingMethod=rr http://www.walmart.com/ca…6&findingMethod=rr

I have been reading about using these marine batteries to run electric on your cart, but I don’t understand how a battery has plugs for electric items.  Can you explain how to set this up?   Not allowed to use gasoline powered generator, could use a propane one, but they are more expensive.  Thanks.

For battery bank sizing… use one of the worksheets from a solar outfit.  you can find them online.  http://www.wholesalesolar.com/battery_sizing.html battery sizing worksheet  It will also help if you decide to pop a few solar panels on the roof at some point down the road.

For everything that you ever wanted to know about 12vDc battery systems
http://www.amplepower.com/primer/index.html Ample Power’s Primer

I’m currently building a battery bank  now for my trailer. I can tell you this much, make sure you DON”T have a cheap battery. If you are going with one battery, make sure it’s a deep cycle marine battery with NO less than a rating of 205AH. I would recommend a Trojan Battery.

I am going to run a small fridge, cash register, laptop, cell charger, car radio, & water pump off of my bank, and I need at least 5 batteries in a series, and that will get me about 5-7 hours max, & at roughly $80-90 a pop it can add up quick, not including the inverter.

franksrocks is right.  i plan to use a marine battery this summer to power a fan.  it looks like one can get the battery and a charger for under a $150…less if you get a cheaper battery.  a guy i know runs a radio or fan 4-6 hours on his (depending on which fan).  the generator will have to wait until i’m rich.

Why couldn’t you use high output marine batteries in series? 

There is a vet that has outdoor rabies clinics in our area and they use the batteries to power 6 laptops and 3 laserjet printers.

i think what they don’t want is a cart being powered by electricity running from a building.  i wouldn’t hesitate to safely run a cord from a small generator to something like a fan, some music or a coffee pot.  it has been my experience that if i’m doing something wrong someone will let me know.  lol

…this was especially true when i was married!

I am eventually going to add batteries to mine and will be working on getting a solar umbrella.  I know of a person that builds them in my area and they work pretty good, from what I hear.  Basically, it is an umbrella with solar panels sewn in.  The guy uses flexible panels to make it work.  The one person I know that has one, uses it to power his electric cooler and it seems to work fine.  Will see if I can find the persons info and post it here.

For my radio, I bought several umbrella radios from a local thrift store.  They use 4 AA batteries and I just buy rechargeable ones.  It works pretty good and has a light on it also. 

a body can’t run an extension cord here in Fla.  i want one of those $700 Honda quiet generators, don’t you?

Sorry I didn’t get back to you all sooner.  Thanks for all of your replies.   I don’t have a big cooler, it is an All American Hot Dogger, but Lorna, that is a great idea.  I have never seen one of those.  I just need it for a couple of things.  Thanks.

Here’s another pic with the fridge. 
 

Well, I dont know if you have seen the EZ carts, but the plans have a space for a cooler for you to keep your meat in.  We made the space a little bigger and put an edgestar f/f instead of the cooler.   This is a pic of my cart.  We took the fridge out in this picture.  You can see the waste water tank and the battery inside.