On 10/04/12 07:04, Eric wrote:
>
> Unfortunately, regardless of random member's analysis of why these units should be cheaper, I'm going to guess that any reliable marine DC generator in the 48V-144V range will be more expensive than an AC generator, primarily due to the limited demand and low production numbers. So I would expect that a Panda, Onan or Kohler AC genset of an equivalent kW output will be cheaper than what you'll find in DC or even what you'll be able to cobble together yourself.
>
> That's just my opinion, but I'm aiming to set realistic expectations. And think of how awesome it would be for all of us if you can prove me wrong...
>
48v DC is also 'Telco Voltage' and there will be a lot of kit around
for it. But Telco's expect and are prepared to pay for, very high
availablity - these gen sets are back up power that just 'has to work'.
So between 'it just has to work' level of engineering AND the 'it's for
a telco mark up', such kit is expensive. It will be absolutely bullet
proof, but expensive.
A DIY really should be cheaper - as you are targeting and entirely
lower level of engineering rigour.
Now you could argue that a marine system should be even tougher than a
Telco spec one - as lives might depend on that system reliably starting
and kicking in, but that's a whole other argument :-)
Now I use a Honda eu20 as backup on my boat - which by any marine
engineering standard is unsuitable for the job - between fumes and fuel
spill potential, but it works for me. (I've never had to use it 'in
anger' fortunately.) I'm aware of the risks and act accordingly. (Like
NOT starting it in the enclosed areas of the boat for starters)
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