Irwin 38 CC Battery and Charge rebuild - Page 3 - SailNet Community
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post #21 of 23 Old 09-21-2012
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Re: Irwin 38 CC Battery and Charge rebuild

What about the auto pilot, radar, lectrasan, water maker,late night 007 DVD, sailnet addiction and power needs of the Admiral? I am in the process of designing my tower but it all has to look good under the panels so in this case size matters. Maybe Bimini array separate from tower array don't know I'm a QE not a EE.

Also where do you think the best place for the radar is? GPS antenna ?

I have a rectangular teak platform I salvaged off an old stink pot. The stern reverse angle will make the usable space of the platform narrower. Think about Bimini tubing/ hardware surrounding the platform for a grab rail and a bow to match the stern radius this should add 5 or 6 inches to the width and give it a custom look. But don't forget the swim latter in the design. Form, fit, and function. Mount some lesser expensive underwater LED's for extended cocktail hour entertainment. I can't wait!

Now that I call elegant engineering! Well said Hellosailor.

I have some really real cool ideas ( not found on the net) for the arch which I am planning to build this fall and would be happy to share my plans and or pictures when complete.
There was a Morgan site that had step by step plans of custom creation but it has disappeared.
Or tower in a box 1500 bucks.
Or you can pay big bucks for a fabricator. I have not seen and any Irwin 38's with custom towers on the net to copy.

Brian, 14x14x11 under 200 bucks in a Irwin condo I call that Ice entertainment.
Looking forward to further collaboration.
With the right tools and the right friends anything is possible.
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post #22 of 23 Old 09-22-2012
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Re: Irwin 38 CC Battery and Charge rebuild

1985 Irwin C
Sole battery box dimensions
9 3/8 deep
10 1/2 wide
29 1/4 long
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post #23 of 23 Old 09-26-2012 Thread Starter
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Re: Irwin 38 CC Battery and Charge rebuild

Tim, I got this from Sandy, another 38 owner on the yahoo forum:

The battery box installed in the MK I & MK II is about 11 1/4" wide by about 28" long. It is set on top of a couple 2"x 4" rails attached to the sides of the bilge compartment so there is about 11-12" of space from the bottom of the box to the underside of the sole. The box was designed for 4 group 24 batteries (2 house 2 start). the 6 v Golf Cart (CG-2) batteries have the same footprint but are a bit taller and still fit in most 38 CCs. If you have your water heater mounted in the bilge just aft of the battery box extending the box back can be done once the WH is moved elsewhere. A new box can be made to add maybe one more group 24 (4 for the house and 1 for start) or maybe even a group 27 or 31.

These rails can be removed and lowered to enable taller batteries that are available in 6 v. You can get easy 100 Amp/Hr more using 4 golf cart batteries especially if you lower the box & use those 6 v batteries that are almost 12" tall. 4 of these can get you up close to 500 Amp/Hr for your house bank. Then you need to be able to add another battery for starting. My WH was in the way so I installed a Group 31 in the locker next to the NavSta for start and used 4 GC-2s under the sole for the house bank.

So MaineSail, as usual was right

The most important part is I can lower the rails to make extra depth for 6v's.

I'm going to re-do those rails (and epoxy coat them) and lower them enough to put 4 T-145's in (those are a tad taller) - they will give me 500+ AH in that bank.
I'm not stuck on Trojans, I use them for comparison.

IIRC it's a straight under the sole run from the locker beside the nav station to the engine, so that should do for the starter battery and a simple louver on the bottom will ventilate it.

Initially - due to budget - I'm going to settle for 2 Kyocera 240w's on the Bimini. Not optimal for clear shot to the sun, but it becomes what is possible. I'm hoping to average 150AH a day out of them using a MPPT controller.
That and a Honda 2000 should be enough - provided I carry enough gasoline in jerry cans.

I'm toying with the idea of a inverter/charger - but balking at the expense. I may just stick with the current Xantrex 20 amp. It's small but if I'm at a pier I'll have at least 24 hours to top off.

I'm not sure about a "tower" - but I think I will extend the davits upward via a arch arrangement that spreads to a "Y", and on the "Y" I will either add another panel, or put two up there. Those 240w panels are big - too many would look pretty bad and catch wind like a sail.

Radar, I'm going to go conventional - on the mast just above the spreader.

As it stands my Raymarine e7d chartplotter has built in GPS that works just fine even when it was on the Gemini under the dog house roof. Using the internal GPS saves me a NMEA 2000 port too. I may put a external antenna up on the aft rail just for a backup.

Lessons learned are opportunities earned.
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