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jluke's avatar
jluke
Explorer
Aug 30, 2017

battery for inverter

I have a 2000 holiday Rambler with a medium sized household refrigerator. I usually rung the generator for a short time every few hours until we reach our destination to keep it cool. We do not boondock. We are about to take a long trip and I decided to install a 1500 pure sine wave inverter connected to the 2-6volt batteries with an extension cord to run the fridge. It won't start with the two batteries so i am going to add a 12 volt battery to the circuit. Should I install a deep cycle battery to run it during the times we stop or do I need the watts a starting battery provides to start the fridge?
  • All bigger inverters I have seen have control lights or LCD panel that says about the status.
    Can we have the status?
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Some things I have learned

    ONE: INverters like to have at least one pair of GC-2 Golf car batteries per 1,000 watts.. NOTE: MORE IS BETTER.

    2: FOr as much of the cable run as possible. TAPE the Positive and Negative cables side by side. to reduce inductance

    FInally.. Whatever cable xize the inverter's manual says to use.. UP SIZE at least one if not two sizes.
  • To answer your question, the batteries used with your inverter must be deep cycle batteries and not starting batteries. If the 2 current 6V batteries are old (or not deep cycle) then I would replace them plus add 2 more 6V batteries to create a 4 battery 12V bank. You will need to ensure you have a battery charger capable of recharging these but assuming your engine alternator will be sending some amount of power to the batteries while driving you will have plenty of power during your travels.
  • Hi,

    Cable size and length are critical on DC circuits. Place the inverter as close to the batteries as possible without it being in the same compartment.
  • before you buy the battery you could use jumper cables from your tow vehicle to the rv battery to see if that is what is needed. check the polarity on the cables carefully don't hook it up wrong! the startup current on the refrigerator will be high to get it started. what size battery cables are you using to hook the inverter to the batteries and how long are they? if they are not big enough the inverter will trip out on low voltage. the inverter will draw over 100 amps from the batteries when the refrigerator starts up. inverter should be as close to the batteries as possible. once you get it working test how long it will run before your batteries run out plug in a old dial type clock and you could tell how long it ran.
  • inverter placement to batteries
    and
    battery age ?
    how old are these batteries
    i ran a compressor fridge on (2) 6v, then (2) 12v, before upgrading 5 years ago
  • Are you sure it's not the lack of surge current the inverter can supply and not so much the batterys?
    Or, maybe the ext. cord is too small?
  • One post at 6:13 and this post at 7:20. Did you read the six responses to the first post?

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