Pontec Reviews 

The lighting set draws 3 W, but the manufacturer packages it with a transformer rated for a maximum of only 3.6 W. As a result, the power supply constantly runs at over 83% of its total capacity. Inside a sealed plastic housing during summer heat, it stands no chance of cooling down, leading to gradual thermal degradation—meaning the transformer dies shortly after the warranty expires.
The manufacturer should really take a hard look in the mirror. For a product with an estimated manufacturing cost of €8–12 (200–300 CZK) that actually sells for €65+ (1,600+ CZK), cutting corners on component ratings is pure arrogance. With such a massive profit margin, a design flaw like this is inexcusable, and customers should hold them accountable.
Don't get scammed, and don't buy the overpriced original replacement part. Just buy any universal 12V AC transformer rated at 10–20 W (e.g. on Allegro/eBay for around €8 / 200 CZK) with the same screw-on connector. It will run cool, last for years, and show the manufacturer that we won't tolerate this kind of behavior.

We purchased a pontec pondosolar 600
After leaving it in the Sun for a number of days we noticed it was not working and did not charge the battery and would not run the pump for the pond.
Dealing with the issue has been near on impossible as it has a lithium battery and cannot be sent back via normal channels.
The manufacturer insists they retest everything and cannot do video calls to Look at the product.
They need to do more testing before they sell the product rather than when they get it returned
A complete waste of time

DONT BUY
This company is terrible, their air pumps are rubbish and do not last, I bought the 3600 and it was useless, the motor burns out and it has always been underpowered.
I have written to the company twice without even an acknowledgement or response.
They do not care about their customers - STAY CLEAR!!

Manufacturer of pond pumps and the like. Do not be misled by their 3-year warranty. If the rotor in your pump fails in that time and your fish die while you are chasing support, you will be told this is “normal wear”. Don’t expect a refund from this slimy lot. Replacing the rotor is not straightforward for a non-specialist, nor is it particularly cheap. Ours failed within two years, and yes, our fish suffocated as a result. This company only gains a second star as its customer service agent was willing to walk us through rotor replacement. We won’t be using this company again. We did have a Laguna branded one before (the impeller blades eventually broke on that), but at least it lasted four years with no other issue.