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I went with a Tundra 1800W inverter in my service van. That's for power tools and my small laser printer (even the little ones pull ~5A and need something a little smoother than a square wave output.)
It was suggested I go with a pair of dedicated 6V golf cart batteries to have some good runtime. I went with a single 12V group 31 deep-cycle gel cell. I can usually keep the van running when I'm using hungry tools, so the reduced amp-hours isn't a big deal.
I added an ACR (automatic charging relay) to keep the gel and cranking batteries separate, yet keep the gel battery charged. Pics are in my gallery.
If you really want to stick with 2 batteries, replace one with a deep-cycle, and manage the bank with and ACR and a bridging switch. That way you can bring them both online for cranking, but otherwise keep the deep cycle charged and separate. Blue Sea Systems make some nice products.
Consider your usage though, and the involved installation. A small, cheap generator supplemented by a 100-300W cig. lighter inverter might suit you needs and wallet better.
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97 E350 SRW minibus, E4OD/D70/4.10, 19.5 whls, BD trans pan, 3 batteries & inverter, tach dash
93 W250 6BTA/5spd/D60/D70/3.55
90 D250 6BT/5spd/D70/3.55
Other rigs I wrench on:
95 F350 CC 4x4 ZF 4.10 Lockright/Detroit, T444E J/W pump, hydroboost, EBPV brake, straight pipe, 5.6k mod, 4" lift, 35" Toyos
Ford 6.9/7.3/IDI/turbo/PSD, 89-02 Dodge CTD
Marine Engines I mess with:
Mitsubishi S6U, S6R, 6D14; Mirrlees National KVSSM; DDC/MTU 12V2000; Cat 353, 398, 3306, 3406
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