What would happen if you placed your panels in series, get an old 500 watt computer power supply, hack it to remove the AC input section and fed the high voltage DC from your panels into the inverter high voltage DC input. The 12 volt DC output would be fairly constant into a fixed load for varying panel voltages. The psu has all the switching components. may be easy to replace (re-wind) the output windings from the low voltage outputs to something more suitable.
Cheers
Mike
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