We purchased a Lofrans 12 volt 1500 watt Tigress windlass several months ago.
It was installed in a 47 foot boat, and has been used since early June, anchoring about 15 times, generally in moderate depths. It has generally worked satisfactorily.

Yesterday we ran a test on the windlass, and were surprised at its inability to raise the anchor and chain when it was hanging free in the water.
The test consisted of lifting 60 m of 10mm chain plus 45kg anchor (total weight 171 kg) hanging down in 70m water
Initially it lifted about 7 metres of chain OK, then the circuit breaker (135 amp) tripped. We lifted 10 m manually, the windlass lifted a few metres and the breaker tripped again. This was repeated until only 20 metres of chain was hanging. Then the windlass pulled the remaining 20 m of chain and 45 kg anchor in OK, including the short heavy load as the anchor shank is pulled over the bow roller.

The battery is a new Otima Blue-Top rated at 1000 Amps max cranking current at 0 deg C. (weather was about 15C at test time). The battery was fully charged. The engine alternator was charging the windlass battery at 30 amps when the anchor windlass was working hard.

Voltage measured directly at motor terminals while under heavy load was 9.3 V. Cables from battery to windlass are #2 AWG tinned multi-stranded copper with all terminals soldered and crimped to the wire. Total positive+ negative cable length under 3 metres. The calculated voltage drip due to cable only is 0.2 volts. Of course there will be a little additional drop due to terminals and the circuit breaker.

9.3 volts seems very low to me. What is your opinion?

The Lofrans catalog lists the Tigres as having a maximum lift capacity of 750 kg, and a working load of 190kg

I have changed the 135 amp breaker to a 150 amp one I had on board, but have not (yet??) retested