Shame, since your cheap EnderIO solar panels don't make EU, while these Advanced Solars do. Funny that, being an IC2 addon isn't it?
But, only to way convert EU: Solar panels -> Energy cable (from extra ulities) or Energy conduit (ender IO) -> transfer node Energy (Extra Ulities) -> Any cables (IC2) to powering IC2 items.
I found out about, there's only to way convert RF. Solars panel -> any cable (IC2) -> Transfer Node Energy (from Extra Ulities mod) -> Energy cable (from Extra Ulities) -> Any capacitors (from Ender IO)
It's good stuff Extra Ulities, thanks to convert transfer energy. (I'm new member with this post 
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