fairing (aaargh!) and other fun jobs, I'm trying to work
out exactly how much space I need for batteries
and associated bits and pieces - so I can build the right sized enclosures and plan cabling/plumbing around them.. as I'm sure you're all aware, everything is related and I'm space/weight/cable path constrained - so when one thing changes, a bunch of other things change. For example - if I go for one brand of charger
(wider) or another (long and thin) with a particular set of dimensions - the grey water
sump dimensions will have to change!
Anyway - here's my whole setup - and could be timely, based on the AGM
lifespan argument^H^H^H^Hdiscussion on another thread..
Following a pile of research
and looking at the idea of multiple alternators etc and additional brackets on my little Yanmar 3gm30
, I have more or less come down to using a Honda
EU20i for the daily charging
regime, supplemented by a single
125W panel (if it fits.. eventually!).
This is all assuming that the few posts I've seen on CF are correct in that there are full time cruisers out there who are using 100A+ chargers with the Honda
As a side-benefit for me
, by using the Honda, I also deal with my hot water
problem as I plan on using one of those 240v electric
tap mounted heaters, remotely mounted for use with a shower
- although obviously not simultaneously with charging
, as the Honda probably won't cope. (As for non-electric heating
- my Yanmar Engine
is raw-water cooled, no space/desire for an electric/diesel heater/tank/etc and lpg storage
is limited to cooking
The Honda itself will be mounted on deck
in a ventilated locker with a hatch
, so that when opened, the Honda will be sitting on a shelf inside, mounted on stainless captive ball bearing full-extension drawer runners - so that the entire generator
can be slid out fully with minimal effort (even by my wife) started and there won't be any heat/fumes/vibration etc problems as it will effectively be outside when being run .. when done, just push back in, lock in place, and close the hatch
, voila. This way, it will be more or less permanently mounted, so no plugging/unplugging/fuel lines etc.. not a bad compromise in my mind. Of course, only possible to run at anchor
Comparisons - 3gm30
will drink 3-4L/hour, Honda will drink 1L - and hey, I can take a hot shower
just after charge time and then maybe even hook up a 240v water
maker to make a bunch of water for another hour afterwards and I'm still ahead fuel
consumption-wise (and apart from the generator
enclosure, won't have to fabricate anything myself or pay somebody a million dollars here in Sydney
to weld up something simple like an additional alternator
bracket).. and since I have limited space for diesel
or petrol, I can extend my time away from having to refuel..
Now all this is great and subject to debate on whether it is the right thing to do and should I instead be using engine
heat and solar/wind etc (no space beyond a single
panel, sorry) - but assuming this decision - the problem is that it is all theoretical.. and based on IF
I can complete the charge cycle that quickly. I've read a bunch of threads on this and many state that the Honda will take 5-6 hours etc, but then there's always the variable of charge acceptance, charger
size etc - so maybe it is possible in my particular case?
OK, so on to batteries
then - with all of this in mind, I'm leaning towards 6 x 6V 225A Fullriver AGMs wired in series/parallel to give 675AH (@ 12V) total. So charge acceptance of 100A should be a non-issue.
I don't know what my daily consumption
will be, but am looking at a Frigoboat keel-cooled compressor
with evaporator plates (in a well insulated box - already built) and a middle-of-the-road general consumption
pattern with high efficiency LED lighting
etc - but I am erring on the side of caution and am using the space constraint to drive the equation for max AH - so this is the max I can fit into that space (and also the reason behind the 6V batts as they will fit better than 255A 12V batts for example).. My consumption guesstimate is 150AH day.
I plan on using the 12V Kipoint 100A charger (KIPOINT ENTERPRISE CO. LTD. www.kipoint.com.tw
) - they're really cheap
and appear to use the IuOU charging mechanism as recommended by Fullriver (http://www.fullriver.com/products/ad...ile/charge.pdf
) - and the voltages are pretty damn close to the Fullriver "ideals" (I've asked and they'll even build a custom unit if you wait two weeks with different setpoints - but for the Fullrivers there's no need):
1. Bulk voltage : 14.6V +/- 0.2V
2. Float voltage : 13.7V +/- 0.2V
3. Sense transfer current from bulk to float : 6A
Lead Acid Battery Charger (100Amp,12Vdc,230Vac ) - New - eBay, Power Tools Equipment, Garage Equipment Tools, Cars, Parts Vehicles. (end time 09-Apr-09 21:07:13 AEST)
The thing that I am worried about here is that the charger states a max current
draw of "13A for 230Vac"
- which works out to be 2990W, almost 1000W above the Honda's max output.. but then again, 14.6V @ 100A is 1460W... so even with inefficiencies, could it be OK?
So in summary (wow that was a long post!) - can you provide your thoughts on the following:
- Thoughts on the overall setup
- Is the Honda going to handle the 100A charger? Are any of you using the Honda EU20i with a ~100A charger? If so which one?
- Has anybody heard of Kipoint? Does anybody have one and are using it on a boat?
- Considering that I don't plan on charging for more than an hour or two MAX - what are your thoughts about potentially cycling the AGMs between 60% and 80% almost on a daily basis with no shorepower (ever) for a long/full charge cycle etc? (Will the single solar panel maybe help with this? Is the full charge even required in my setup for long AGM battery life?)
- Bearing in mind the 60-80% parameters and my ~150AH/day usage - can I expect to run the Honda for 1.5 hours to get those amps back in my setup?
Thank you copiously for reading my version of War and Peace!