|Topic Review (Newest First)|
|10-18-2008 12:02 PM|
|sailingdog||Actually for wet cells, in hot summer conditions, self-discharge can be as high as 1% per day...|
|10-18-2008 11:29 AM|
Waltsn...very nice spread sheet. I hope others here download it and use it to plan their systems out. Thanks.
The only quibble I have with the sheet is that you do not account for the self discharge of the batteries which can be as high as 1/2% per day with flooded batteries. In a winter storage or longer disuse situation, this becomes rather critical but cn be ignored for boats used every couple of weeks.
|10-18-2008 09:01 AM|
My boat sits on a trailer and gets used typically one day per week and about once per summer for four or five days in a row. The electrical and power use is probably similar to your mooring. I did an xls spread sheet of my power generation and use - its here:
The spread sheet tells me two things - can my 20 watt solar panel supply all my needs during the summer if I just use the boat one day per week (it does) and if I have fully charged batteries, how many days will my battery charge last.
FYI, the 20 watt solar panel has a charge regulator and I leave the batteries in the boat all winter. The place where the boat lives (in Colorado) is close to a lake which gets up to three feet of ice on it during the winter. I havnt had any issue with batteries doing this for five years now.
|10-18-2008 08:16 AM|
Originally Posted by brak View Post
brak, if the charger really is "Designed to maintain 12 volt batteries up to 250 amp hours...," why are you trying to maintain 500AH worth of batteries on it?
If you'd seen the worn-out old UPS I once put under load literally shoot flames out the back when its solid-state components overheated and lost it, or any of the other number of solid-state electronics I've seen burst into flames over the years, you'd understand why I shun such conditions.
|10-18-2008 05:30 AM|
IIRC, ICP made those small regulators for just this purpose.
Originally Posted by sailboy21 View Post
|10-18-2008 12:37 AM|
Originally Posted by particlepood View Post
Anyways, here is how I keep things topped up w/o shorepower.
ICP 10 Amp regulators can be had cheap, about $40 a piece. You can run two of them in parallel from one bank of solar panels to two battery banks. They work with gell-cell. Their internal circuitry protects them from reverse current. I don't know if ICP intended them to be used this way but it has been working great for me for at least 3 years. Two 55 Watt Siemens panels supply power to them, but you could get by with less. I wouldn't have invested in these for weekend use but luckily they came with the boat. Sounds like you aren't looking for loads of power. One 5 watt panel per battery would probably keep up charge with intermittent use if you live in sunny-ville.
|10-18-2008 12:06 AM|
This question has most likely been addressed here a number of times but I'll ask anyway. I'm looking for a solar system to charge a two bank of deep cycle sealed gel batteries with a regulator to avoid overcharging. The boat will be kept on a mooring so shore power is not an option and removing the batteries every weekend isn't all that appealing. The only items that will be run off them are the compass backlight, marine radio, depth sounder, cabin lights and power outlet for a blender or other such things. I have posted before and I really don't need sarcasm or offhanded remarks. So please if you have any experience or advise I would be very grateful.
|10-17-2008 11:36 PM|
|brak||And why would you think there is a bad battery?|
|10-17-2008 10:37 PM|
|badsanta||I still say you have a BAD battery, and need to test and start there first. IMOHO|
|10-17-2008 10:25 PM|
When battery charger manufacturers say battery, they generally mean one battery electrically... .not necessarily a single physical battery.
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