Hi Stuart,
I'm no expert in electric windlasses but I know enough about the pitfalls of anchor windlasses, matching chain to gypsy, and in particular about 12v DC motor driven products & voltage drop, to strongly advise you to fully inform yourself of those pitfalls before you make any form of purchase decision, whether you choose DIY or professional installation.
Understanding the details of your installation is far more important than which brand of windlass you ultimately buy, and will greatly inform your purchase decision.
In my opinion an excellent starting point would be to invest in a copy of 3rd edition of Nigel Calder's "Boatowner's Mechanical and Electrical Manual" otherwise known by many as the "Boat Owner's Bible" [discounted on Amazon]. The 17 or so pages on windlasses will rapidly and concisely enlighten you in plain english and ensure that you do not fall into an elephant trap! And the rest of this tome will come in handy time after time in the future.
Your biggest single installation problems will almost result from the size of the electrical cables that you will require in terms of both routing them and crimping them, as they will need to be a similar size to your battery cables - if not theoretically bigger! Calder quotes cable sizes in AWG for his US readers, but provides a conversion table from AWG to sq mm & mm dia in his section on proper electrical installations.
Geoff Sheddick
Parker 27/146 "Stroller'
Geoff Sheddick
Parker 27/146 "Stroller'