Guggenheim Solar ETF $TAN turned bullish in the second half of 2017. After a correction in late November, it still looks bullish heading into 2018.TAN Daily Chart(click to enlarge)Support:- As TAN retreated from 25.50, we can see that there was going to be a cluster of support factors around 22.50-23. - This area includes a rising trendline and a previous resistance pivot. - Furthermore, the daily RSI was around 40 and if the market is bullish, it should stay above 40 - which it did.- We might see some more consolidation as 24.25-24.50 represents a minor resistance (was a previous support area).- But, I think the price action so far over the last few months signal a bullish push in 2018. - If so, I think there is upside to 32. - On the other hand, if price falls below 22, we might see some further correction towards the 19-20 area, which would be a deep correction. But even in this scenario, TAN could be developing a bottom, in which case the 32 area would still be in sight.- The weekly chart shows a market that has rounded a bottom. Also the RSI pushed far above 70, reflecting the start of bullish momentum.TAN Weekly Chart(click to enlarge)