The Shanghai Cooltech Power Co., Ltd. (SZSE:300153) share price has fared very poorly over the last month, falling by a substantial 28%. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 24% in that time.

Although its price has dipped substantially, Shanghai Cooltech Power's price-to-earnings (or "P/E") ratio of 60.8x might still make it look like a strong sell right now compared to the market in China, where around half of the companies have P/E ratios below 27x and even P/E's below 17x are quite common. However, the P/E might be quite high for a reason and it requires further investigation to determine if it's justified.

Shanghai Cooltech Power certainly has been doing a great job lately as it's been growing earnings at a really rapid pace. The P/E is probably high because investors think this strong earnings growth will be enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

What Are Growth Metrics Telling Us About The High P/E?

In order to justify its P/E ratio, Shanghai Cooltech Power would need to produce outstanding growth well in excess of the market.

Retrospectively, the last year delivered an exceptional 133% gain to the company's bottom line. Although, its longer-term performance hasn't been as strong with three-year EPS growth being relatively non-existent overall. Accordingly, shareholders probably wouldn't have been overly satisfied with the unstable medium-term growth rates.

Comparing that to the market, which is predicted to deliver 42% growth in the next 12 months, the company's momentum is weaker based on recent medium-term annualised earnings results.

With this information, we find it concerning that Shanghai Cooltech Power is trading at a P/E higher than the market. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. There's a good chance existing shareholders are setting themselves up for future disappointment if the P/E falls to levels more in line with recent growth rates.

What We Can Learn From Shanghai Cooltech Power's P/E?

Shanghai Cooltech Power's shares may have retreated, but its P/E is still flying high. We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Shanghai Cooltech Power currently trades on a much higher than expected P/E since its recent three-year growth is lower than the wider market forecast. When we see weak earnings with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. If recent medium-term earnings trends continue, it will place shareholders' investments at significant risk and potential investors in danger of paying an excessive premium.

A lot of potential risks can sit within a company's balance sheet. Take a look at our free balance sheet analysis for Shanghai Cooltech Power with six simple checks on some of these key factors.

You might be able to find a better investment than Shanghai Cooltech Power. If you want a selection of possible candidates, check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.