Recent content by althemusicwizard

I've been told by the designer of the cat (Richard Woods) that the hull speed is probably 7-8 knots. To get it to plane you would need to increase the speed to around 12 knots and it would require 10hp more per knot increase in speed. If I could do 5 knots on 2-3kwh of battery I would consider...

https://www.ebay.co.uk/itm/404039387204?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=xSQy3lEsReG&sssrc=4429486&ssuid=&var=&widget_ver=artemis&media=EMAIL

Are 300v DC solar inverters a bad idea for a catamaran? I've just been reading some other posts about electric boats and I've decided to limit my own project to 48v batteries and electric motors. I have twelve 500w panels that I was going to wire in two banks of 3kw per side of the cat, running...

Drop anchor? Drift? Sorry, I couldn't resist. You have to forgive my naiveity as my only sailing experience was a 'pot luck' fortnight in Greece 30 years ago. I have now bought the cat. It's a power cat so there are no sails. It already has two 250litre fuel tanks so I'm thinking of fitting two...

Many thanks for the reply. I've been so busy with the cat that I haven't checked in here for a while. I've decided to go with a 48v system as the EPropulsion X series are just too expensive for me. I have ordered six Seplos Mason 15kWh batteries and will use three for each side of the cat. I...

Thanks for that link. I'll have to find out how much the E-Propulsion X40 are going to cost and work from there. Their own G-Series batteries are rated at a maximum charge / discharge of 100A, therefore to run the 40kW motor at peak you'd need four batteries in parallel, I think. Most BMS for...

I've just come across a brand new outboard from E-Propulsion, the X-40D. I've no idea how much it's going to cost, but it's almost like it was made for my cat. Back to the drawing board as it's 96V. I'm going to take a look at the EV forums and find outhow to build a 96V bank and how to charge it.

WOW, for a sailboat? Just found that video....indeed a might battery bank.

Thanks for the replies. The lack of 96V stuff and the fact that it IS 96V stuff, has made me decide that as far as electric is concerned, I'm sticking with 48V. The 48V stuff in the UK has come down in price to make this feasible and I haven't got the kind of budget that 'yacht owners' have. It...

Hers is a sailboat isn't it? This is a power cat. She won't have a 60-90kWh battery bank on her yacht will she?

Thanks for that......it just has to be the other way round. The input is 96V to 230V AC output. Now if it was 230V AC to 96V DC, then it would kind of work direct to the motors from the output of the inverters (paralleled), however you'd only get 10kW from the two inverters so would not be...

Thanks for those replies. I'd have to look into diodes etc. as it's above my pay-grade :).......but the combination of separate AGM banks and separate solar inverter for the AGM bank so I could hit it hard when needed, might be a solution.

For anyone who's looked into this problem before (solar boat), I compiled what video history I could find of 'Solarwave 42'. This was the boat that Heike and Micheal Kohler designed and built and now they run Silent Yachts. https://www.silent-yachts.com/ In one shot, it shows the nav station...

It's not the problem of building a 96V pack (though finding a BMS that is tried and tested may be) it's then charging that from the 48V (or the 230V AC) that will be coming from the panels / inverters / 48V LiFePO4 bank.

Oh sorry....I won't have a problem getting a 12V or 24V supply from the 48V bank for running 'boaty' stuff, nor for 230V AC which will come straight from the inverters, it's the 96V DC supply to the inverters that I'm having difficulty with.