Hi Dexter, It generally is not a good idea to mix 2 different types of batteries. Are your current batteries 12V or 6V? You may be able to get by if you add 4 6V batteries to your existing 6V batteries, however the older batteries will not last long and will probably cause trouble.
I assume you are wanting to increase inverter output? Or, are you trying to get the inverter running longer on the current you are drawing presently?
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Marv
2005 American Eagle
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